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 class org.eclipse.collections.impl.lazy.iterator.TapIterator<T> implements java.util.Iterator<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.eclipse.collections.impl.lazy.iterator.TapIterator
  super_class: java.lang.Object
{
  private final java.util.Iterator<T> iterator;
    descriptor: Ljava/util/Iterator;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Iterator<TT;>;

  private final org.eclipse.collections.api.block.procedure.Procedure<? super T> procedure;
    descriptor: Lorg/eclipse/collections/api/block/procedure/Procedure;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Lorg/eclipse/collections/api/block/procedure/Procedure<-TT;>;

  public void <init>(java.lang.Iterable<T>, org.eclipse.collections.api.block.procedure.Procedure<? super T>);
    descriptor: (Ljava/lang/Iterable;Lorg/eclipse/collections/api/block/procedure/Procedure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
        start local 1 // java.lang.Iterable iterable
        start local 2 // org.eclipse.collections.api.block.procedure.Procedure procedure
         0: .line 24
            aload 0 /* this */
            aload 1 /* iterable */
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            aload 2 /* procedure */
            invokespecial org.eclipse.collections.impl.lazy.iterator.TapIterator.<init>:(Ljava/util/Iterator;Lorg/eclipse/collections/api/block/procedure/Procedure;)V
         1: .line 25
            return
        end local 2 // org.eclipse.collections.api.block.procedure.Procedure procedure
        end local 1 // java.lang.Iterable iterable
        end local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/eclipse/collections/impl/lazy/iterator/TapIterator<TT;>;
            0    2     1   iterable  Ljava/lang/Iterable<TT;>;
            0    2     2  procedure  Lorg/eclipse/collections/api/block/procedure/Procedure<-TT;>;
    Signature: (Ljava/lang/Iterable<TT;>;Lorg/eclipse/collections/api/block/procedure/Procedure<-TT;>;)V
    MethodParameters:
           Name  Flags
      iterable   
      procedure  

  public void <init>(java.util.Iterator<T>, org.eclipse.collections.api.block.procedure.Procedure<? super T>);
    descriptor: (Ljava/util/Iterator;Lorg/eclipse/collections/api/block/procedure/Procedure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
        start local 1 // java.util.Iterator iterator
        start local 2 // org.eclipse.collections.api.block.procedure.Procedure procedure
         0: .line 27
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 29
            aload 0 /* this */
            aload 1 /* iterator */
            putfield org.eclipse.collections.impl.lazy.iterator.TapIterator.iterator:Ljava/util/Iterator;
         2: .line 30
            aload 0 /* this */
            aload 2 /* procedure */
            putfield org.eclipse.collections.impl.lazy.iterator.TapIterator.procedure:Lorg/eclipse/collections/api/block/procedure/Procedure;
         3: .line 31
            return
        end local 2 // org.eclipse.collections.api.block.procedure.Procedure procedure
        end local 1 // java.util.Iterator iterator
        end local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    4     0       this  Lorg/eclipse/collections/impl/lazy/iterator/TapIterator<TT;>;
            0    4     1   iterator  Ljava/util/Iterator<TT;>;
            0    4     2  procedure  Lorg/eclipse/collections/api/block/procedure/Procedure<-TT;>;
    Signature: (Ljava/util/Iterator<TT;>;Lorg/eclipse/collections/api/block/procedure/Procedure<-TT;>;)V
    MethodParameters:
           Name  Flags
      iterator   
      procedure  

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
         0: .line 36
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.iterator.TapIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ireturn
        end local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/lazy/iterator/TapIterator<TT;>;

  public T next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
         0: .line 42
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.iterator.TapIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            astore 1 /* next */
        start local 1 // java.lang.Object next
         1: .line 43
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.iterator.TapIterator.procedure:Lorg/eclipse/collections/api/block/procedure/Procedure;
            aload 1 /* next */
            invokeinterface org.eclipse.collections.api.block.procedure.Procedure.value:(Ljava/lang/Object;)V
         2: .line 44
            aload 1 /* next */
            areturn
        end local 1 // java.lang.Object next
        end local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/lazy/iterator/TapIterator<TT;>;
            1    3     1  next  TT;
    Signature: ()TT;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
         0: .line 50
            new java.lang.UnsupportedOperationException
            dup
            ldc "Cannot remove from a tap iterator"
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // org.eclipse.collections.impl.lazy.iterator.TapIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/lazy/iterator/TapIterator<TT;>;
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Iterator<TT;>;
SourceFile: "TapIterator.java"