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 
public abstract class org.eclipse.collections.impl.block.procedure.ComparatorProcedure<T> implements org.eclipse.collections.api.block.procedure.Procedure<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.eclipse.collections.impl.block.procedure.ComparatorProcedure
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  protected final java.util.Comparator<? super T> comparator;
    descriptor: Ljava/util/Comparator;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Signature: Ljava/util/Comparator<-TT;>;

  protected boolean visitedAtLeastOnce;
    descriptor: Z
    flags: (0x0004) ACC_PROTECTED

  protected T result;
    descriptor: Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Signature: TT;

  protected void <init>(java.util.Comparator<? super T>);
    descriptor: (Ljava/util/Comparator;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.block.procedure.ComparatorProcedure this
        start local 1 // java.util.Comparator comparator
         0: .line 27
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 29
            aload 0 /* this */
            aload 1 /* comparator */
            putfield org.eclipse.collections.impl.block.procedure.ComparatorProcedure.comparator:Ljava/util/Comparator;
         2: .line 30
            return
        end local 1 // java.util.Comparator comparator
        end local 0 // org.eclipse.collections.impl.block.procedure.ComparatorProcedure this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    3     0        this  Lorg/eclipse/collections/impl/block/procedure/ComparatorProcedure<TT;>;
            0    3     1  comparator  Ljava/util/Comparator<-TT;>;
    Signature: (Ljava/util/Comparator<-TT;>;)V
    MethodParameters:
            Name  Flags
      comparator  

  public boolean isVisitedAtLeastOnce();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.block.procedure.ComparatorProcedure this
         0: .line 34
            aload 0 /* this */
            getfield org.eclipse.collections.impl.block.procedure.ComparatorProcedure.visitedAtLeastOnce:Z
            ireturn
        end local 0 // org.eclipse.collections.impl.block.procedure.ComparatorProcedure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/block/procedure/ComparatorProcedure<TT;>;

  public T getResult();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.block.procedure.ComparatorProcedure this
         0: .line 39
            aload 0 /* this */
            getfield org.eclipse.collections.impl.block.procedure.ComparatorProcedure.visitedAtLeastOnce:Z
            ifne 2
         1: .line 41
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
         2: .line 43
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.block.procedure.ComparatorProcedure.result:Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.block.procedure.ComparatorProcedure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/block/procedure/ComparatorProcedure<TT;>;
    Signature: ()TT;

  public java.util.Optional<T> getResultOptional();
    descriptor: ()Ljava/util/Optional;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.block.procedure.ComparatorProcedure this
         0: .line 48
            aload 0 /* this */
            getfield org.eclipse.collections.impl.block.procedure.ComparatorProcedure.visitedAtLeastOnce:Z
            ifne 2
         1: .line 50
            invokestatic java.util.Optional.empty:()Ljava/util/Optional;
            areturn
         2: .line 52
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.block.procedure.ComparatorProcedure.result:Ljava/lang/Object;
            invokestatic java.util.Optional.of:(Ljava/lang/Object;)Ljava/util/Optional;
            areturn
        end local 0 // org.eclipse.collections.impl.block.procedure.ComparatorProcedure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/block/procedure/ComparatorProcedure<TT;>;
    Signature: ()Ljava/util/Optional<TT;>;
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Lorg/eclipse/collections/api/block/procedure/Procedure<TT;>;
SourceFile: "ComparatorProcedure.java"