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

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

  public int compare(T, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=5, args_size=3
        start local 0 // org.eclipse.collections.impl.block.comparator.primitive.IntFunctionComparator 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.IntFunctionComparator.function:Lorg/eclipse/collections/api/block/function/primitive/IntFunction;
            aload 1 /* o1 */
            invokeinterface org.eclipse.collections.api.block.function.primitive.IntFunction.intValueOf:(Ljava/lang/Object;)I
            istore 3 /* one */
        start local 3 // int one
         1: .line 36
            aload 0 /* this */
            getfield org.eclipse.collections.impl.block.comparator.primitive.IntFunctionComparator.function:Lorg/eclipse/collections/api/block/function/primitive/IntFunction;
            aload 2 /* o2 */
            invokeinterface org.eclipse.collections.api.block.function.primitive.IntFunction.intValueOf:(Ljava/lang/Object;)I
            istore 4 /* two */
        start local 4 // int two
         2: .line 37
            iload 3 /* one */
            iload 4 /* two */
            if_icmpge 3
            iconst_m1
            goto 5
      StackMap locals: int int
      StackMap stack:
         3: iload 3 /* one */
            iload 4 /* two */
            if_icmple 4
            iconst_1
            goto 5
      StackMap locals:
      StackMap stack:
         4: iconst_0
      StackMap locals:
      StackMap stack: int
         5: ireturn
        end local 4 // int two
        end local 3 // int 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.IntFunctionComparator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/eclipse/collections/impl/block/comparator/primitive/IntFunctionComparator<TT;>;
            0    6     1    o1  TT;
            0    6     2    o2  TT;
            1    6     3   one  I
            2    6     4   two  I
    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: "IntFunctionComparator.java"