https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar
  • Sirisha Pratha 
public interface org.eclipse.collections.impl.block.function.primitive.CharFunction extends java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.eclipse.collections.impl.block.function.primitive.CharFunction
  super_class: java.lang.Object
{
  public static final org.eclipse.collections.impl.block.function.primitive.CharFunction TO_UPPERCASE;
    descriptor: Lorg/eclipse/collections/impl/block/function/primitive/CharFunction;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  public static final org.eclipse.collections.impl.block.function.primitive.CharFunction TO_LOWERCASE;
    descriptor: Lorg/eclipse/collections/impl/block/function/primitive/CharFunction;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 26
            new org.eclipse.collections.impl.block.function.primitive.CharFunction$1
            dup
            invokespecial org.eclipse.collections.impl.block.function.primitive.CharFunction$1.<init>:()V
            putstatic org.eclipse.collections.impl.block.function.primitive.CharFunction.TO_UPPERCASE:Lorg/eclipse/collections/impl/block/function/primitive/CharFunction;
         1: .line 36
            new org.eclipse.collections.impl.block.function.primitive.CharFunction$2
            dup
            invokespecial org.eclipse.collections.impl.block.function.primitive.CharFunction$2.<init>:()V
            putstatic org.eclipse.collections.impl.block.function.primitive.CharFunction.TO_LOWERCASE:Lorg/eclipse/collections/impl/block/function/primitive/CharFunction;
         2: .line 44
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public abstract char valueOf(char);
    descriptor: (C)C
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
           Name  Flags
      character  
}
SourceFile: "CharFunction.java"
NestMembers:
  org.eclipse.collections.impl.block.function.primitive.CharFunction$1  org.eclipse.collections.impl.block.function.primitive.CharFunction$2
InnerClasses:
  org.eclipse.collections.impl.block.function.primitive.CharFunction$1
  org.eclipse.collections.impl.block.function.primitive.CharFunction$2
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()