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 
class org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions$ToUpperCaseCharToCharFunction implements org.eclipse.collections.api.block.function.primitive.CharToCharFunction
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions$ToUpperCaseCharToCharFunction
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions$ToUpperCaseCharToCharFunction this
         0: .line 36
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions$ToUpperCaseCharToCharFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/block/factory/primitive/CharToCharFunctions$ToUpperCaseCharToCharFunction;

  public char valueOf(char);
    descriptor: (C)C
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions$ToUpperCaseCharToCharFunction this
        start local 1 // char character
         0: .line 43
            iload 1 /* character */
            invokestatic java.lang.Character.toUpperCase:(C)C
            ireturn
        end local 1 // char character
        end local 0 // org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions$ToUpperCaseCharToCharFunction this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    1     0       this  Lorg/eclipse/collections/impl/block/factory/primitive/CharToCharFunctions$ToUpperCaseCharToCharFunction;
            0    1     1  character  C
    MethodParameters:
           Name  Flags
      character  
}
SourceFile: "CharToCharFunctions.java"
NestHost: org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions
InnerClasses:
  private ToUpperCaseCharToCharFunction = org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions$ToUpperCaseCharToCharFunction of org.eclipse.collections.impl.block.factory.primitive.CharToCharFunctions