https://commons.apache.org/proper/commons-collections/: The Apache Commons Collections package contains types that extend and augment the Java Collections Framework. (The Apache Software Foundation)
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public class org.apache.commons.collections4.iterators.ZippingIterator<E> implements java.util.Iterator<E>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.commons.collections4.iterators.ZippingIterator
  super_class: java.lang.Object
{
  private final java.util.Iterator<java.util.Iterator<? extends E>> iterators;
    descriptor: Ljava/util/Iterator;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Iterator<Ljava/util/Iterator<+TE;>;>;

  private java.util.Iterator<? extends E> nextIterator;
    descriptor: Ljava/util/Iterator;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/Iterator<+TE;>;

  private java.util.Iterator<? extends E> lastReturned;
    descriptor: Ljava/util/Iterator;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/Iterator<+TE;>;

  public void <init>(java.util.Iterator<? extends E>, java.util.Iterator<? extends E>);
    descriptor: (Ljava/util/Iterator;Ljava/util/Iterator;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
        start local 1 // java.util.Iterator a
        start local 2 // java.util.Iterator b
         0: .line 61
            aload 0 /* this */
            iconst_2
            anewarray java.util.Iterator
            dup
            iconst_0
            aload 1 /* a */
            aastore
            dup
            iconst_1
            aload 2 /* b */
            aastore
            invokespecial org.apache.commons.collections4.iterators.ZippingIterator.<init>:([Ljava/util/Iterator;)V
         1: .line 62
            return
        end local 2 // java.util.Iterator b
        end local 1 // java.util.Iterator a
        end local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/commons/collections4/iterators/ZippingIterator<TE;>;
            0    2     1     a  Ljava/util/Iterator<+TE;>;
            0    2     2     b  Ljava/util/Iterator<+TE;>;
    Signature: (Ljava/util/Iterator<+TE;>;Ljava/util/Iterator<+TE;>;)V
    MethodParameters:
      Name  Flags
      a     final
      b     final

  public void <init>(java.util.Iterator<? extends E>, java.util.Iterator<? extends E>, java.util.Iterator<? extends E>);
    descriptor: (Ljava/util/Iterator;Ljava/util/Iterator;Ljava/util/Iterator;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=4
        start local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
        start local 1 // java.util.Iterator a
        start local 2 // java.util.Iterator b
        start local 3 // java.util.Iterator c
         0: .line 77
            aload 0 /* this */
            iconst_3
            anewarray java.util.Iterator
            dup
            iconst_0
            aload 1 /* a */
            aastore
            dup
            iconst_1
            aload 2 /* b */
            aastore
            dup
            iconst_2
            aload 3 /* c */
            aastore
            invokespecial org.apache.commons.collections4.iterators.ZippingIterator.<init>:([Ljava/util/Iterator;)V
         1: .line 78
            return
        end local 3 // java.util.Iterator c
        end local 2 // java.util.Iterator b
        end local 1 // java.util.Iterator a
        end local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/commons/collections4/iterators/ZippingIterator<TE;>;
            0    2     1     a  Ljava/util/Iterator<+TE;>;
            0    2     2     b  Ljava/util/Iterator<+TE;>;
            0    2     3     c  Ljava/util/Iterator<+TE;>;
    Signature: (Ljava/util/Iterator<+TE;>;Ljava/util/Iterator<+TE;>;Ljava/util/Iterator<+TE;>;)V
    MethodParameters:
      Name  Flags
      a     final
      b     final
      c     final

  public void <init>(java.util.Iterator<? extends E>[]);
    descriptor: ([Ljava/util/Iterator;)V
    flags: (0x0081) ACC_PUBLIC, ACC_VARARGS
    Code:
      stack=3, locals=7, args_size=2
        start local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
        start local 1 // java.util.Iterator[] iterators
         0: .line 87
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 43
            aload 0 /* this */
            aconst_null
            putfield org.apache.commons.collections4.iterators.ZippingIterator.nextIterator:Ljava/util/Iterator;
         2: .line 46
            aload 0 /* this */
            aconst_null
            putfield org.apache.commons.collections4.iterators.ZippingIterator.lastReturned:Ljava/util/Iterator;
         3: .line 89
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            astore 2 /* list */
        start local 2 // java.util.List list
         4: .line 90
            aload 1 /* iterators */
            dup
            astore 6
            arraylength
            istore 5
            iconst_0
            istore 4
            goto 10
      StackMap locals: org.apache.commons.collections4.iterators.ZippingIterator java.util.Iterator[] java.util.List top int int java.util.Iterator[]
      StackMap stack:
         5: aload 6
            iload 4
            aaload
            astore 3 /* iterator */
        start local 3 // java.util.Iterator iterator
         6: .line 91
            aload 3 /* iterator */
            ifnonnull 8
         7: .line 92
            new java.lang.NullPointerException
            dup
            ldc "Iterator must not be null."
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         8: .line 94
      StackMap locals: org.apache.commons.collections4.iterators.ZippingIterator java.util.Iterator[] java.util.List java.util.Iterator int int java.util.Iterator[]
      StackMap stack:
            aload 2 /* list */
            aload 3 /* iterator */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        end local 3 // java.util.Iterator iterator
         9: .line 90
            iinc 4 1
      StackMap locals: org.apache.commons.collections4.iterators.ZippingIterator java.util.Iterator[] java.util.List top int int java.util.Iterator[]
      StackMap stack:
        10: iload 4
            iload 5
            if_icmplt 5
        11: .line 96
            aload 0 /* this */
            aload 2 /* list */
            invokestatic org.apache.commons.collections4.FluentIterable.of:(Ljava/lang/Iterable;)Lorg/apache/commons/collections4/FluentIterable;
            invokevirtual org.apache.commons.collections4.FluentIterable.loop:()Lorg/apache/commons/collections4/FluentIterable;
            invokevirtual org.apache.commons.collections4.FluentIterable.iterator:()Ljava/util/Iterator;
            putfield org.apache.commons.collections4.iterators.ZippingIterator.iterators:Ljava/util/Iterator;
        12: .line 97
            return
        end local 2 // java.util.List list
        end local 1 // java.util.Iterator[] iterators
        end local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0   13     0       this  Lorg/apache/commons/collections4/iterators/ZippingIterator<TE;>;
            0   13     1  iterators  [Ljava/util/Iterator;
            4   13     2       list  Ljava/util/List<Ljava/util/Iterator<+TE;>;>;
            6    9     3   iterator  Ljava/util/Iterator<+TE;>;
    Signature: ([Ljava/util/Iterator<+TE;>;)V
    MethodParameters:
           Name  Flags
      iterators  final

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
         0: .line 111
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.ZippingIterator.nextIterator:Ljava/util/Iterator;
            ifnull 7
         1: .line 112
            iconst_1
            ireturn
         2: .line 116
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.ZippingIterator.iterators:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.util.Iterator
            astore 1 /* childIterator */
        start local 1 // java.util.Iterator childIterator
         3: .line 117
            aload 1 /* childIterator */
            invokeinterface java.util.Iterator.hasNext:()Z
            ifeq 6
         4: .line 118
            aload 0 /* this */
            aload 1 /* childIterator */
            putfield org.apache.commons.collections4.iterators.ZippingIterator.nextIterator:Ljava/util/Iterator;
         5: .line 119
            iconst_1
            ireturn
         6: .line 122
      StackMap locals: java.util.Iterator
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.ZippingIterator.iterators:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.remove:()V
        end local 1 // java.util.Iterator childIterator
         7: .line 115
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.ZippingIterator.iterators:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 2
         8: .line 124
            iconst_0
            ireturn
        end local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    9     0           this  Lorg/apache/commons/collections4/iterators/ZippingIterator<TE;>;
            3    7     1  childIterator  Ljava/util/Iterator<+TE;>;

  public E next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
         0: .line 135
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.iterators.ZippingIterator.hasNext:()Z
            ifne 2
         1: .line 136
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
         2: .line 139
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.ZippingIterator.nextIterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            astore 1 /* val */
        start local 1 // java.lang.Object val
         3: .line 140
            aload 0 /* this */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.ZippingIterator.nextIterator:Ljava/util/Iterator;
            putfield org.apache.commons.collections4.iterators.ZippingIterator.lastReturned:Ljava/util/Iterator;
         4: .line 141
            aload 0 /* this */
            aconst_null
            putfield org.apache.commons.collections4.iterators.ZippingIterator.nextIterator:Ljava/util/Iterator;
         5: .line 142
            aload 1 /* val */
            areturn
        end local 1 // java.lang.Object val
        end local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/apache/commons/collections4/iterators/ZippingIterator<TE;>;
            3    6     1   val  TE;
    Exceptions:
      throws java.util.NoSuchElementException
    Signature: ()TE;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
         0: .line 153
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.ZippingIterator.lastReturned:Ljava/util/Iterator;
            ifnonnull 2
         1: .line 154
            new java.lang.IllegalStateException
            dup
            ldc "No value can be removed at present"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 156
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.ZippingIterator.lastReturned:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.remove:()V
         3: .line 157
            aload 0 /* this */
            aconst_null
            putfield org.apache.commons.collections4.iterators.ZippingIterator.lastReturned:Ljava/util/Iterator;
         4: .line 158
            return
        end local 0 // org.apache.commons.collections4.iterators.ZippingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/commons/collections4/iterators/ZippingIterator<TE;>;
}
Signature: <E:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Iterator<TE;>;
SourceFile: "ZippingIterator.java"