Represents a field descriptor (JVM type format) as defined in the Java Virtual Machine Specification, section 4.3.2.

For example, in

 package org.checkerframework.checker.signature;
 public class SignatureChecker {
   private class Inner {}
 }

the field descriptors for the two types are Lorg/checkerframework/checker/signature/SignatureChecker; and Lorg/checkerframework/checker/signature/SignatureChecker$Inner; .