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.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator extends org.eclipse.collections.impl.set.immutable.AbstractImmutableSet<T>.ImmutableSetIterator
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator
  super_class: org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator
{
  final org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet this$0;
    descriptor: Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  protected void <init>(org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet);
    descriptor: (Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator this
         0: .line 170
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator.this$0:Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet;
            aload 0 /* this */
            aload 1
            invokespecial org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator.<init>:(Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet;)V
            return
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet$QuadrupletonSetIterator;
    MethodParameters:
        Name  Flags
      this$0  final

  protected T getElement();
    descriptor: (I)Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator this
        start local 1 // int i
         0: .line 176
            iload 1 /* i */
            ifne 2
         1: .line 178
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator.this$0:Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet;
            getfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet.element1:Ljava/lang/Object;
            areturn
         2: .line 180
      StackMap locals:
      StackMap stack:
            iload 1 /* i */
            iconst_1
            if_icmpne 4
         3: .line 182
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator.this$0:Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet;
            getfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet.element2:Ljava/lang/Object;
            areturn
         4: .line 184
      StackMap locals:
      StackMap stack:
            iload 1 /* i */
            iconst_2
            if_icmpne 6
         5: .line 186
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator.this$0:Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet;
            getfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet.element3:Ljava/lang/Object;
            areturn
         6: .line 188
      StackMap locals:
      StackMap stack:
            iload 1 /* i */
            iconst_3
            if_icmpne 8
         7: .line 190
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator.this$0:Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet;
            getfield org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet.element4:Ljava/lang/Object;
            areturn
         8: .line 192
      StackMap locals:
      StackMap stack:
            new java.util.NoSuchElementException
            dup
            new java.lang.StringBuilder
            dup
            ldc "i="
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 1 /* i */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.util.NoSuchElementException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // int i
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableQuadrupletonSet$QuadrupletonSetIterator;
            0    9     1     i  I
    Signature: (I)TT;
    MethodParameters:
      Name  Flags
      i     
}
Signature: Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet<TT;>.ImmutableSetIterator;
SourceFile: "ImmutableQuadrupletonSet.java"
NestHost: org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet
InnerClasses:
  protected abstract ImmutableSetIterator = org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator of org.eclipse.collections.impl.set.immutable.AbstractImmutableSet
  protected QuadrupletonSetIterator = org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet$QuadrupletonSetIterator of org.eclipse.collections.impl.set.immutable.ImmutableQuadrupletonSet