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 class org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator<T> implements org.eclipse.collections.api.block.SerializableComparator<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  private final org.eclipse.collections.api.block.function.primitive.DoubleFunction<T> function;
    descriptor: Lorg/eclipse/collections/api/block/function/primitive/DoubleFunction;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Lorg/eclipse/collections/api/block/function/primitive/DoubleFunction<TT;>;

  public void <init>(org.eclipse.collections.api.block.function.primitive.DoubleFunction<T>);
    descriptor: (Lorg/eclipse/collections/api/block/function/primitive/DoubleFunction;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator this
        start local 1 // org.eclipse.collections.api.block.function.primitive.DoubleFunction function
         0: .line 27
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 29
            aload 0 /* this */
            aload 1 /* function */
            putfield org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator.function:Lorg/eclipse/collections/api/block/function/primitive/DoubleFunction;
         2: .line 30
            return
        end local 1 // org.eclipse.collections.api.block.function.primitive.DoubleFunction function
        end local 0 // org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    3     0      this  Lorg/eclipse/collections/impl/block/comparator/primitive/DoubleFunctionComparator<TT;>;
            0    3     1  function  Lorg/eclipse/collections/api/block/function/primitive/DoubleFunction<TT;>;
    Signature: (Lorg/eclipse/collections/api/block/function/primitive/DoubleFunction<TT;>;)V
    MethodParameters:
          Name  Flags
      function  

  public int compare(T, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=7, args_size=3
        start local 0 // org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator this
        start local 1 // java.lang.Object o1
        start local 2 // java.lang.Object o2
         0: .line 35
            aload 0 /* this */
            getfield org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator.function:Lorg/eclipse/collections/api/block/function/primitive/DoubleFunction;
            aload 1 /* o1 */
            invokeinterface org.eclipse.collections.api.block.function.primitive.DoubleFunction.doubleValueOf:(Ljava/lang/Object;)D
            dstore 3 /* one */
        start local 3 // double one
         1: .line 36
            aload 0 /* this */
            getfield org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator.function:Lorg/eclipse/collections/api/block/function/primitive/DoubleFunction;
            aload 2 /* o2 */
            invokeinterface org.eclipse.collections.api.block.function.primitive.DoubleFunction.doubleValueOf:(Ljava/lang/Object;)D
            dstore 5 /* two */
        start local 5 // double two
         2: .line 37
            dload 3 /* one */
            dload 5 /* two */
            invokestatic java.lang.Double.compare:(DD)I
            ireturn
        end local 5 // double two
        end local 3 // double one
        end local 2 // java.lang.Object o2
        end local 1 // java.lang.Object o1
        end local 0 // org.eclipse.collections.impl.block.comparator.primitive.DoubleFunctionComparator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/block/comparator/primitive/DoubleFunctionComparator<TT;>;
            0    3     1    o1  TT;
            0    3     2    o2  TT;
            1    3     3   one  D
            2    3     5   two  D
    Signature: (TT;TT;)I
    MethodParameters:
      Name  Flags
      o1    
      o2    
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Lorg/eclipse/collections/api/block/SerializableComparator<TT;>;
SourceFile: "DoubleFunctionComparator.java"