OpenJDK 1.23 · java.io.IO · APIdia, the JavaDoc alternative

A collection of static convenience methods that provide access to system console for implicitly declared classes.

Each of this class' methods throws IOError if the system console is null; otherwise, the effect is as if a similarly-named method had been called on that console.

Input and output from methods in this class use the character set of the system console as specified by Console#charset.

Constructor Summary

Access	Constructor and Description
private	IO()

Method Summary

Modifier and Type	Method and Description
private static Console	con()
public static void	print(Object the object to print, may be `null` obj) Writes a string representation of the specified object to the system console and then flushes that console.
public static void	println(Object the object to print, may be `null` obj) Writes a string representation of the specified object to the system console, terminates the line and then flushes that console.
public static String	Returns: a string containing the line read from the system console, not including any line-termination characters. Returns `null` if an end of stream has been reached without having read any characters. readln(String the prompt string, may be `null` prompt) Writes a prompt as if by calling `print`, then reads a single line of text from the system console.

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

Constructor Detail

IO	back to summary
private IO()

Method Detail

con	back to summary
private static Console con()

print back to summary

print	back to summary
public static void print(Object obj) Writes a string representation of the specified object to the system console and then flushes that console. The effect is as if `print(obj)` had been called on `System.console()`. Parameters obj:Object the object to print, may be `null` Exceptions IOError: if `System.console()` returns `null`, or if an I/O error occurs

public static void print(Object obj)

Writes a string representation of the specified object to the system console and then flushes that console.

The effect is as if print(obj) had been called on System.console().

Parameters

obj:Object: the object to print, may be null

Exceptions

IOError:: if System.console() returns null, or if an I/O error occurs

println back to summary

println	back to summary
public static void println(Object obj) Writes a string representation of the specified object to the system console, terminates the line and then flushes that console. The effect is as if `println(obj)` had been called on `System.console()`. Parameters obj:Object the object to print, may be `null` Exceptions IOError: if `System.console()` returns `null`, or if an I/O error occurs

public static void println(Object obj)

Writes a string representation of the specified object to the system console, terminates the line and then flushes that console.

The effect is as if println(obj) had been called on System.console().

Parameters

obj:Object: the object to print, may be null

Exceptions

IOError:: if System.console() returns null, or if an I/O error occurs

readln back to summary

readln	back to summary
public static String readln(String prompt) Writes a prompt as if by calling `print`, then reads a single line of text from the system console. The effect is as if `readln(prompt)` had been called on `System.console()`. Parameters prompt:String the prompt string, may be `null` Returns:String a string containing the line read from the system console, not including any line-termination characters. Returns `null` if an end of stream has been reached without having read any characters. Exceptions IOError: if `System.console()` returns `null`, or if an I/O error occurs

public static String readln(String prompt)

Writes a prompt as if by calling print, then reads a single line of text from the system console.

The effect is as if readln(prompt) had been called on System.console().

Parameters

prompt:String: the prompt string, may be null

Returns:String

a string containing the line read from the system console, not including any line-termination characters. Returns null if an end of stream has been reached without having read any characters.

Exceptions

IOError:: if System.console() returns null, or if an I/O error occurs

public final Class IO

Constructor Summary

Method Summary

Constructor Detail

Method Detail