Spring Core 6.1.4 · org.springframework.util.ObjectUtils

Modifier and Type	Field and Description
private static final String	ARRAY_ELEMENT_SEPARATOR
private static final String	ARRAY_END
private static final String	ARRAY_START
private static final String	COLLECTION
private static final String	EMPTY_ARRAY
private static final Object[]	EMPTY_OBJECT_ARRAY
private static final String	EMPTY_STRING
private static final String	MAP
private static final String	NON_EMPTY_ARRAY
private static final String	NULL_STRING

Access	Constructor and Description
public	ObjectUtils()

Method Summary

Modifier and Type	Method and Description
public static <A, O extends A> A[]	Returns: the new array (of the same component type; never `null`) addObjectToArray(A[] the array to append to (can be `null`) array, O the object to append obj) Append the given object to the given array, returning a new array consisting of the input array contents plus the given object.
public static <A, O extends A> A[]	Returns: the new array (of the same component type; never `null`) addObjectToArray(A[] the array to add to (can be `null`) array, O the object to append obj, int the position at which to add the object position) Add the given object to the given array at the specified position, returning a new array consisting of the input array contents plus the given object.
private static boolean	Returns: whether the given objects are equal arrayEquals(Object first array to compare o1, Object second array to compare o2) Compare the given arrays with `Arrays.equals`, performing an equality check based on the array elements rather than the array reference.
public static < the concrete Enum type E extends Enum<?>> E	caseInsensitiveValueOf(E[] the array of all Enum constants in question, usually per `Enum.values()` enumValues, String the constant to get the enum value of constant) Case insensitive alternative to `Enum#valueOf(Class, String)`.
public static boolean	Returns: whether the constant has been found in the given array containsConstant(Enum<?>[] the enum values to check, typically obtained via `MyEnum.values()` enumValues, String the constant name to find (must not be null or empty string) constant) Check whether the given array of enum constants contains a constant with the given name, ignoring case when determining a match.
public static boolean	Returns: whether the constant has been found in the given array containsConstant(Enum<?>[] the enum values to check, typically obtained via `MyEnum.values()` enumValues, String the constant name to find (must not be null or empty string) constant, boolean whether case is significant in determining a match caseSensitive) Check whether the given array of enum constants contains a constant with the given name.
public static boolean	Returns: whether the element has been found in the given array containsElement(Object[] the array to check (may be `null`, in which case the return value will always be `false`) array, Object the element to check for element) Check whether the given array contains the given element.
public static String	Returns: a display String representation of `obj` getDisplayString(Object the object to build a display String for obj) Return a content-based String representation if `obj` is not `null`; otherwise returns an empty String.
public static String	Returns: the object's identity code in hex notation getIdentityHexString(Object the object obj) Return a hex String form of an object's identity hash code.
public static String	Returns: the object's identity as String representation, or an empty String if the object was `null` identityToString(Object the object (may be `null`) obj) Return a String representation of an object's overall identity.
public static boolean	isArray(Object the object to check obj) Determine whether the given object is an array: either an Object array or a primitive array.
public static boolean	Returns: whether the throwable is a checked exception isCheckedException(Throwable the throwable to check ex) Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error.
public static boolean	Returns: whether the given exception is compatible isCompatibleWithThrowsClause(Throwable the exception to check ex, Class<?>... the exception types declared in the throws clause declaredExceptions) Check whether the given exception is compatible with the specified exception types, as declared in a `throws` clause.
public static boolean	isEmpty(Object[] the array to check array) Determine whether the given array is empty: i.e. `null` or of zero length.
public static boolean	Returns: `true` if the object is `null` or empty isEmpty(Object the object to check obj) Determine whether the given object is empty.
public static String	Returns: the corresponding class name nullSafeClassName(Object the object to introspect (may be `null`) obj) Determine the class name for the given object.
public static String	Returns: a concise string representation of the supplied object nullSafeConciseToString(Object the object to build a string representation for obj) Generate a null-safe, concise string representation of the supplied object as described below.
public static boolean	Returns: whether the given objects are equal nullSafeEquals(Object first Object to compare o1, Object second Object to compare o2) Determine if the given objects are equal, returning `true` if both are `null` or `false` if only one is `null`.
public static int	Returns: a hash value of the elements nullSafeHash(Object... the elements to be hashed elements) Return a hash code for the given elements, delegating to `nullSafeHashCode(Object)` for each element.
public static int	nullSafeHashCode(Object obj) Return a hash code for the given object; typically the value of `Object#hashCode()`}.
public static int	nullSafeHashCode(Object[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(Object[])` Return a hash code based on the contents of the specified array.
public static int	nullSafeHashCode(boolean[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(boolean[])` Return a hash code based on the contents of the specified array.
public static int	nullSafeHashCode(byte[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(byte[])` Return a hash code based on the contents of the specified array.
public static int	nullSafeHashCode(char[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(char[])` Return a hash code based on the contents of the specified array.
public static int	nullSafeHashCode(double[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(double[])` Return a hash code based on the contents of the specified array.
public static int	nullSafeHashCode(float[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(float[])` Return a hash code based on the contents of the specified array.
public static int	nullSafeHashCode(int[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(int[])` Return a hash code based on the contents of the specified array.
public static int	nullSafeHashCode(long[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(long[])` Return a hash code based on the contents of the specified array.
public static int	nullSafeHashCode(short[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(short[])` Return a hash code based on the contents of the specified array.
public static String	Returns: a String representation of `obj` nullSafeToString(Object the object to build a String representation for obj) Return a String representation of the specified Object.
public static String	Returns: a String representation of `array` nullSafeToString(Object[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static String	Returns: a String representation of `array` nullSafeToString(boolean[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static String	Returns: a String representation of `array` nullSafeToString(byte[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static String	Returns: a String representation of `array` nullSafeToString(char[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static String	Returns: a String representation of `array` nullSafeToString(double[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static String	Returns: a String representation of `array` nullSafeToString(float[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static String	Returns: a String representation of `array` nullSafeToString(int[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static String	Returns: a String representation of `array` nullSafeToString(long[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static String	Returns: a String representation of `array` nullSafeToString(short[] the array to build a String representation for array) Return a String representation of the contents of the specified array.
public static Object[]	Returns: the corresponding object array (never `null`) toObjectArray(Object the (potentially primitive) array source) Convert the given array (which may be a primitive array) to an object array (if necessary of primitive wrapper objects).
public static Object	Returns: either the value held within the `Optional`, `null` if the `Optional` is empty, or simply the given object as-is unwrapOptional(Object the candidate object obj) Unwrap the given object which is potentially a `java.util.Optional`.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

ARRAY_ELEMENT_SEPARATOR	back to summary
private static final String ARRAY_ELEMENT_SEPARATOR

ARRAY_END	back to summary
private static final String ARRAY_END

ARRAY_START	back to summary
private static final String ARRAY_START

COLLECTION	back to summary
private static final String COLLECTION

EMPTY_ARRAY	back to summary
private static final String EMPTY_ARRAY

EMPTY_OBJECT_ARRAY	back to summary
private static final Object[] EMPTY_OBJECT_ARRAY

EMPTY_STRING	back to summary
private static final String EMPTY_STRING

MAP	back to summary
private static final String MAP

NON_EMPTY_ARRAY	back to summary
private static final String NON_EMPTY_ARRAY

NULL_STRING	back to summary
private static final String NULL_STRING

ObjectUtils	back to summary
public ObjectUtils()

Method Detail

addObjectToArray back to summary

addObjectToArray	back to summary
public static <A, O extends A> A[] addObjectToArray(A[] array, O obj) Append the given object to the given array, returning a new array consisting of the input array contents plus the given object. Parameters array:A[] the array to append to (can be `null`) obj:O the object to append Returns:A[] the new array (of the same component type; never `null`)

public static <A, O extends A> A[] addObjectToArray(A[] array, O obj)

Append the given object to the given array, returning a new array consisting of the input array contents plus the given object.

Parameters

array:A[]: the array to append to (can be null)
obj:O: the object to append

Returns:A[]

the new array (of the same component type; never null)

addObjectToArray back to summary

addObjectToArray	back to summary
public static <A, O extends A> A[] addObjectToArray(A[] array, O obj, int position) Add the given object to the given array at the specified position, returning a new array consisting of the input array contents plus the given object. Parameters array:A[] the array to add to (can be `null`) obj:O the object to append position:int the position at which to add the object Returns:A[] the new array (of the same component type; never `null`) Since 6.0

public static <A, O extends A> A[] addObjectToArray(A[] array, O obj, int position)

Add the given object to the given array at the specified position, returning a new array consisting of the input array contents plus the given object.

Parameters

array:A[]: the array to add to (can be null)
obj:O: the object to append
position:int: the position at which to add the object

Returns:A[]

the new array (of the same component type; never null)

Since

6.0

arrayEquals back to summary

arrayEquals	back to summary
private static boolean arrayEquals(Object o1, Object o2) Compare the given arrays with `Arrays.equals`, performing an equality check based on the array elements rather than the array reference. Parameters o1:Object first array to compare o2:Object second array to compare Returns:boolean whether the given objects are equal See Also `nullSafeEquals(Object, Object)`, `java.util.Arrays#equals`

private static boolean arrayEquals(Object o1, Object o2)

Compare the given arrays with Arrays.equals, performing an equality check based on the array elements rather than the array reference.

Parameters

o1:Object: first array to compare
o2:Object: second array to compare

Returns:boolean

whether the given objects are equal

caseInsensitiveValueOf back to summary

caseInsensitiveValueOf	back to summary
public static <E extends Enum<?>> E caseInsensitiveValueOf(E[] enumValues, String constant) Case insensitive alternative to `Enum#valueOf(Class, String)`. Parameters <E> the concrete Enum type enumValues:E[] the array of all Enum constants in question, usually per `Enum.values()` constant:String the constant to get the enum value of Exceptions IllegalArgumentException: if the given constant is not found in the given array of enum values. Use `containsConstant(Enum[], String)` as a guard to avoid this exception.

public static <E extends Enum<?>> E caseInsensitiveValueOf(E[] enumValues, String constant)

Case insensitive alternative to Enum#valueOf(Class, String).

Parameters

<E>: the concrete Enum type
enumValues:E[]: the array of all Enum constants in question, usually per Enum.values()
constant:String: the constant to get the enum value of

Exceptions

IllegalArgumentException:: if the given constant is not found in the given array of enum values. Use containsConstant(Enum[], String) as a guard to avoid this exception.

containsConstant back to summary

containsConstant	back to summary
public static boolean containsConstant(Enum<?>[] enumValues, String constant) Check whether the given array of enum constants contains a constant with the given name, ignoring case when determining a match. Parameters enumValues:Enum<?>[] the enum values to check, typically obtained via `MyEnum.values()` constant:String the constant name to find (must not be null or empty string) Returns:boolean whether the constant has been found in the given array

public static boolean containsConstant(Enum<?>[] enumValues, String constant)

Check whether the given array of enum constants contains a constant with the given name, ignoring case when determining a match.

Parameters

enumValues:Enum<?>[]: the enum values to check, typically obtained via MyEnum.values()
constant:String: the constant name to find (must not be null or empty string)

Returns:boolean

whether the constant has been found in the given array

containsConstant back to summary

containsConstant	back to summary
public static boolean containsConstant(Enum<?>[] enumValues, String constant, boolean caseSensitive) Check whether the given array of enum constants contains a constant with the given name. Parameters enumValues:Enum<?>[] the enum values to check, typically obtained via `MyEnum.values()` constant:String the constant name to find (must not be null or empty string) caseSensitive:boolean whether case is significant in determining a match Returns:boolean whether the constant has been found in the given array

public static boolean containsConstant(Enum<?>[] enumValues, String constant, boolean caseSensitive)

Check whether the given array of enum constants contains a constant with the given name.

Parameters

enumValues:Enum<?>[]: the enum values to check, typically obtained via MyEnum.values()
constant:String: the constant name to find (must not be null or empty string)
caseSensitive:boolean: whether case is significant in determining a match

Returns:boolean

whether the constant has been found in the given array

containsElement back to summary

containsElement	back to summary
public static boolean containsElement(Object[] array, Object element) Check whether the given array contains the given element. Parameters array:Object[] the array to check (may be `null`, in which case the return value will always be `false`) element:Object the element to check for Returns:boolean whether the element has been found in the given array

public static boolean containsElement(Object[] array, Object element)

Check whether the given array contains the given element.

Parameters

array:Object[]: the array to check (may be null, in which case the return value will always be false)
element:Object: the element to check for

Returns:boolean

whether the element has been found in the given array

getDisplayString back to summary

getDisplayString	back to summary
public static String getDisplayString(Object obj) Return a content-based String representation if `obj` is not `null`; otherwise returns an empty String. Differs from `nullSafeToString(Object)` in that it returns an empty String rather than "null" for a `null` value. Parameters obj:Object the object to build a display String for Returns:String a display String representation of `obj` See Also `nullSafeToString(Object)`

public static String getDisplayString(Object obj)

Return a content-based String representation if obj is not null; otherwise returns an empty String.

Differs from nullSafeToString(Object) in that it returns an empty String rather than "null" for a null value.

Parameters

obj:Object: the object to build a display String for

Returns:String

a display String representation of obj

See Also

nullSafeToString(Object)

getIdentityHexString	back to summary
public static String getIdentityHexString(Object obj) Return a hex String form of an object's identity hash code. Parameters obj:Object the object Returns:String the object's identity code in hex notation

getIdentityHexString

back to summary

public static String getIdentityHexString(Object obj)

Return a hex String form of an object's identity hash code.

Parameters

obj:Object: the object

Returns:String

the object's identity code in hex notation

identityToString back to summary

identityToString	back to summary
public static String identityToString(Object obj) Return a String representation of an object's overall identity. Parameters obj:Object the object (may be `null`) Returns:String the object's identity as String representation, or an empty String if the object was `null`

public static String identityToString(Object obj)

Return a String representation of an object's overall identity.

Parameters

obj:Object: the object (may be null)

Returns:String

the object's identity as String representation, or an empty String if the object was null

isArray	back to summary
public static boolean isArray(Object obj) Determine whether the given object is an array: either an Object array or a primitive array. Parameters obj:Object the object to check

isArray

back to summary

public static boolean isArray(Object obj)

Determine whether the given object is an array: either an Object array or a primitive array.

Parameters

obj:Object: the object to check

isCheckedException back to summary

isCheckedException	back to summary
public static boolean isCheckedException(Throwable ex) Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error. Parameters ex:Throwable the throwable to check Returns:boolean whether the throwable is a checked exception See Also `java.lang.Exception`, `java.lang.RuntimeException`, `java.lang.Error`

public static boolean isCheckedException(Throwable ex)

Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error.

Parameters

ex:Throwable: the throwable to check

Returns:boolean

whether the throwable is a checked exception

isCompatibleWithThrowsClause back to summary

isCompatibleWithThrowsClause	back to summary
public static boolean isCompatibleWithThrowsClause(Throwable ex, Class<?>... declaredExceptions) Check whether the given exception is compatible with the specified exception types, as declared in a `throws` clause. Parameters ex:Throwable the exception to check declaredExceptions:Class<?>[] the exception types declared in the throws clause Returns:boolean whether the given exception is compatible

public static boolean isCompatibleWithThrowsClause(Throwable ex, Class<?>... declaredExceptions)

Check whether the given exception is compatible with the specified exception types, as declared in a throws clause.

Parameters

ex:Throwable: the exception to check
declaredExceptions:Class<?>[]: the exception types declared in the throws clause

Returns:boolean

whether the given exception is compatible

isEmpty back to summary

isEmpty	back to summary
public static boolean isEmpty(Object[] array) Determine whether the given array is empty: i.e. `null` or of zero length. Parameters array:Object[] the array to check See Also `isEmpty(Object)`

public static boolean isEmpty(Object[] array)

Determine whether the given array is empty: i.e. null or of zero length.

Parameters

array:Object[]: the array to check

See Also

isEmpty(Object)

isEmpty back to summary

isEmpty	back to summary
public static boolean isEmpty(Object obj) Determine whether the given object is empty. This method supports the following object types. `Optional`: considered empty if not `Optional#isPresent()` `Array`: considered empty if its length is zero `CharSequence`: considered empty if its length is zero `Collection`: delegates to `Collection#isEmpty()` `Map`: delegates to `Map#isEmpty()` If the given object is non-null and not one of the aforementioned supported types, this method returns `false`. Parameters obj:Object the object to check Returns:boolean `true` if the object is `null` or empty Since 4.2 See Also `Optional#isPresent()`, `ObjectUtils#isEmpty(Object[])`, `StringUtils#hasLength(CharSequence)`, `CollectionUtils#isEmpty(java.util.Collection)`, `CollectionUtils#isEmpty(java.util.Map)`

public static boolean isEmpty(Object obj)

Determine whether the given object is empty.

This method supports the following object types.

Optional: considered empty if not Optional#isPresent()
Array: considered empty if its length is zero
CharSequence: considered empty if its length is zero
Collection: delegates to Collection#isEmpty()
Map: delegates to Map#isEmpty()

If the given object is non-null and not one of the aforementioned supported types, this method returns false.

Parameters

obj:Object: the object to check

Returns:boolean

true if the object is null or empty

Since

4.2

nullSafeClassName back to summary

nullSafeClassName	back to summary
public static String nullSafeClassName(Object obj) Determine the class name for the given object. Returns a `"null"` String if `obj` is `null`. Parameters obj:Object the object to introspect (may be `null`) Returns:String the corresponding class name

public static String nullSafeClassName(Object obj)

Determine the class name for the given object.

Returns a "null" String if obj is null.

Parameters

obj:Object: the object to introspect (may be null)

Returns:String

the corresponding class name

nullSafeConciseToString back to summary

nullSafeConciseToString	back to summary
public static String nullSafeConciseToString(Object obj) Generate a null-safe, concise string representation of the supplied object as described below. Favor this method over `nullSafeToString(Object)` when you need the length of the generated string to be limited. Returns: `"null"` if `obj` is `null` `"Optional.empty"` if `obj` is an empty `Optional` `"Optional[<concise-string>]"` if `obj` is a non-empty `Optional`, where `<concise-string>` is the result of invoking this method on the object contained in the `Optional` `"{}"` if `obj` is an empty array `"{...}"` if `obj` is a `Map` or a non-empty array `"[...]"` if `obj` is a `Collection` Class name if `obj` is a `Class` Charset name if `obj` is a `Charset` TimeZone ID if `obj` is a `TimeZone` Zone ID if `obj` is a `ZoneId` Potentially truncated string if `obj` is a `String` or `CharSequence` Potentially truncated string if `obj` is a simple value type whose `toString()` method returns a non-null value Otherwise, a string representation of the object's type name concatenated with `"@"` and a hex string form of the object's identity hash code In the context of this method, a simple value type is any of the following: primitive wrapper (excluding `Void`), `Enum`, `Number`, `Date`, `Temporal`, `File`, `Path`, `URI`, `URL`, `InetAddress`, `Currency`, `Locale`, `UUID`, `Pattern`. Parameters obj:Object the object to build a string representation for Returns:String a concise string representation of the supplied object Since 5.3.27 See Also `nullSafeToString(Object)`, `StringUtils#truncate(CharSequence)`, `ClassUtils#isSimpleValueType(Class)`

public static String nullSafeConciseToString(Object obj)

Generate a null-safe, concise string representation of the supplied object as described below.

Favor this method over nullSafeToString(Object) when you need the length of the generated string to be limited.

Returns:

"null" if obj is null
"Optional.empty" if obj is an empty Optional
"Optional[<concise-string>]" if obj is a non-empty Optional, where <concise-string> is the result of invoking this method on the object contained in the Optional
"{}" if obj is an empty array
"{...}" if obj is a Map or a non-empty array
"[...]" if obj is a Collection
Class name if obj is a Class
Charset name if obj is a Charset
TimeZone ID if obj is a TimeZone
Zone ID if obj is a ZoneId
Potentially truncated string if obj is a String or CharSequence
Potentially truncated string if obj is a simple value type whose toString() method returns a non-null value
Otherwise, a string representation of the object's type name concatenated with "@" and a hex string form of the object's identity hash code

In the context of this method, a simple value type is any of the following: primitive wrapper (excluding Void), Enum, Number, Date, Temporal, File, Path, URI, URL, InetAddress, Currency, Locale, UUID, Pattern.

Parameters

obj:Object: the object to build a string representation for

Returns:String

a concise string representation of the supplied object

Since

5.3.27

nullSafeEquals back to summary

nullSafeEquals	back to summary
public static boolean nullSafeEquals(Object o1, Object o2) Determine if the given objects are equal, returning `true` if both are `null` or `false` if only one is `null`. Compares arrays with `Arrays.equals`, performing an equality check based on the array elements rather than the array reference. Parameters o1:Object first Object to compare o2:Object second Object to compare Returns:boolean whether the given objects are equal See Also `Object#equals(Object)`, `java.util.Arrays#equals`

public static boolean nullSafeEquals(Object o1, Object o2)

Determine if the given objects are equal, returning true if both are null or false if only one is null.

Compares arrays with Arrays.equals, performing an equality check based on the array elements rather than the array reference.

Parameters

o1:Object: first Object to compare
o2:Object: second Object to compare

Returns:boolean

whether the given objects are equal

nullSafeHash back to summary

nullSafeHash	back to summary
public static int nullSafeHash(Object... elements) Return a hash code for the given elements, delegating to `nullSafeHashCode(Object)` for each element. Contrary to `Objects#hash(Object...)`, this method can handle an element that is an array. Parameters elements:Object[] the elements to be hashed Returns:int a hash value of the elements Since 6.1

public static int nullSafeHash(Object... elements)

Return a hash code for the given elements, delegating to nullSafeHashCode(Object) for each element. Contrary to Objects#hash(Object...), this method can handle an element that is an array.

Parameters

elements:Object[]: the elements to be hashed

Returns:int

a hash value of the elements

Since

6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(Object obj) Return a hash code for the given object; typically the value of `Object#hashCode()`}. If the object is an array, this method will delegate to any of the `Arrays.hashCode` methods. If the object is `null`, this method returns 0. See Also `Object#hashCode()`, `Arrays`

public static int nullSafeHashCode(Object obj)

Return a hash code for the given object; typically the value of Object#hashCode()}. If the object is an array, this method will delegate to any of the Arrays.hashCode methods. If the object is null, this method returns 0.

See Also: Object#hashCode(), Arrays

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(Object[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(Object[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(Object[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(Object[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(boolean[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(boolean[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(boolean[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(boolean[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(byte[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(byte[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(byte[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(byte[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(char[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(char[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(char[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(char[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(double[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(double[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(double[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(double[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(float[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(float[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(float[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(float[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(int[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(int[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(int[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(int[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(long[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(long[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(long[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(long[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeHashCode back to summary

nullSafeHashCode	back to summary
public static int nullSafeHashCode(short[] array) Deprecated since 6.1. as of 6.1 in favor of `Arrays#hashCode(short[])` Return a hash code based on the contents of the specified array. If `array` is `null`, this method returns 0. Annotations @Deprecated since:6.1

public static int nullSafeHashCode(short[] array)

Deprecated

since 6.1.

as of 6.1 in favor of Arrays#hashCode(short[])

Return a hash code based on the contents of the specified array. If array is null, this method returns 0.

Annotations

@Deprecated
since:6.1

nullSafeToString back to summary

nullSafeToString	back to summary
public static String nullSafeToString(Object obj) Return a String representation of the specified Object. Builds a String representation of the contents in case of an array. Returns a `"null"` String if `obj` is `null`. Parameters obj:Object the object to build a String representation for Returns:String a String representation of `obj` See Also `nullSafeConciseToString(Object)`

public static String nullSafeToString(Object obj)

Return a String representation of the specified Object.

Builds a String representation of the contents in case of an array. Returns a "null" String if obj is null.

Parameters

obj:Object: the object to build a String representation for

Returns:String

a String representation of obj

See Also

nullSafeConciseToString(Object)

nullSafeToString back to summary

nullSafeToString	back to summary
public static String nullSafeToString(Object[] array) Return a String representation of the contents of the specified array. The String representation consists of a list of the array's elements, enclosed in curly braces (`"{}"`). Adjacent elements are separated by the characters `", "` (a comma followed by a space). Returns a `"null"` String if `array` is `null`. Parameters array:Object[] the array to build a String representation for Returns:String a String representation of `array`

public static String nullSafeToString(Object[] array)

Return a String representation of the contents of the specified array.

The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.

Parameters

array:Object[]: the array to build a String representation for

Returns:String

a String representation of array

nullSafeToString back to summary

nullSafeToString	back to summary
public static String nullSafeToString(boolean[] array) Return a String representation of the contents of the specified array. The String representation consists of a list of the array's elements, enclosed in curly braces (`"{}"`). Adjacent elements are separated by the characters `", "` (a comma followed by a space). Returns a `"null"` String if `array` is `null`. Parameters array:boolean[] the array to build a String representation for Returns:String a String representation of `array`

public static String nullSafeToString(boolean[] array)

Return a String representation of the contents of the specified array.

Parameters

array:boolean[]: the array to build a String representation for

Returns:String

a String representation of array

nullSafeToString back to summary

nullSafeToString	back to summary
public static String nullSafeToString(byte[] array) Return a String representation of the contents of the specified array. The String representation consists of a list of the array's elements, enclosed in curly braces (`"{}"`). Adjacent elements are separated by the characters `", "` (a comma followed by a space). Returns a `"null"` String if `array` is `null`. Parameters array:byte[] the array to build a String representation for Returns:String a String representation of `array`

public static String nullSafeToString(byte[] array)

Return a String representation of the contents of the specified array.

Parameters

array:byte[]: the array to build a String representation for

Returns:String

a String representation of array

nullSafeToString back to summary

nullSafeToString	back to summary
public static String nullSafeToString(char[] array) Return a String representation of the contents of the specified array. The String representation consists of a list of the array's elements, enclosed in curly braces (`"{}"`). Adjacent elements are separated by the characters `", "` (a comma followed by a space). Returns a `"null"` String if `array` is `null`. Parameters array:char[] the array to build a String representation for Returns:String a String representation of `array`

public static String nullSafeToString(char[] array)

Return a String representation of the contents of the specified array.

Parameters

array:char[]: the array to build a String representation for

Returns:String

a String representation of array

nullSafeToString back to summary

nullSafeToString	back to summary
public static String nullSafeToString(double[] array) Return a String representation of the contents of the specified array. The String representation consists of a list of the array's elements, enclosed in curly braces (`"{}"`). Adjacent elements are separated by the characters `", "` (a comma followed by a space). Returns a `"null"` String if `array` is `null`. Parameters array:double[] the array to build a String representation for Returns:String a String representation of `array`

public static String nullSafeToString(double[] array)

Return a String representation of the contents of the specified array.

Parameters

array:double[]: the array to build a String representation for

Returns:String

a String representation of array

nullSafeToString back to summary

nullSafeToString	back to summary
public static String nullSafeToString(float[] array) Return a String representation of the contents of the specified array. The String representation consists of a list of the array's elements, enclosed in curly braces (`"{}"`). Adjacent elements are separated by the characters `", "` (a comma followed by a space). Returns a `"null"` String if `array` is `null`. Parameters array:float[] the array to build a String representation for Returns:String a String representation of `array`

public static String nullSafeToString(float[] array)

Return a String representation of the contents of the specified array.

Parameters

array:float[]: the array to build a String representation for

Returns:String

a String representation of array

nullSafeToString back to summary

public static String nullSafeToString(int[] array)

Return a String representation of the contents of the specified array.

Parameters

array:int[]: the array to build a String representation for

Returns:String

a String representation of array

nullSafeToString back to summary

public static String nullSafeToString(long[] array)

Return a String representation of the contents of the specified array.

Parameters

array:long[]: the array to build a String representation for

Returns:String

a String representation of array

nullSafeToString back to summary

public static String nullSafeToString(short[] array)

Return a String representation of the contents of the specified array.

Parameters

array:short[]: the array to build a String representation for

Returns:String

a String representation of array

toObjectArray back to summary

public static Object[] toObjectArray(Object source)

Convert the given array (which may be a primitive array) to an object array (if necessary of primitive wrapper objects).

A null source value will be converted to an empty Object array.

Parameters

source:Object: the (potentially primitive) array

Returns:Object[]

the corresponding object array (never null)

Exceptions

IllegalArgumentException:: if the parameter is not an array

unwrapOptional back to summary

public static Object unwrapOptional(Object obj)

Unwrap the given object which is potentially a java.util.Optional.

Parameters

obj:Object: the candidate object

Returns:Object

either the value held within the Optional, null if the Optional is empty, or simply the given object as-is

Annotations

@Nullable

Since

5.0

public abstract Class ObjectUtils

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