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)
  • Rafael U. C. Afonso
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public class org.apache.commons.collections4.iterators.PeekingIterator<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.PeekingIterator
  super_class: java.lang.Object
{
  private final java.util.Iterator<? extends E> iterator;
    descriptor: Ljava/util/Iterator;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Iterator<+TE;>;

  private boolean exhausted;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

  private boolean slotFilled;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

  private E slot;
    descriptor: Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Signature: TE;

  public static <E> org.apache.commons.collections4.iterators.PeekingIterator<E> peekingIterator(java.util.Iterator<? extends E>);
    descriptor: (Ljava/util/Iterator;)Lorg/apache/commons/collections4/iterators/PeekingIterator;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // java.util.Iterator iterator
         0: .line 58
            aload 0 /* iterator */
            ifnonnull 2
         1: .line 59
            new java.lang.NullPointerException
            dup
            ldc "Iterator must not be null"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 61
      StackMap locals:
      StackMap stack:
            aload 0 /* iterator */
            instanceof org.apache.commons.collections4.iterators.PeekingIterator
            ifeq 5
         3: .line 63
            aload 0 /* iterator */
            checkcast org.apache.commons.collections4.iterators.PeekingIterator
            astore 1 /* it */
        start local 1 // org.apache.commons.collections4.iterators.PeekingIterator it
         4: .line 64
            aload 1 /* it */
            areturn
        end local 1 // org.apache.commons.collections4.iterators.PeekingIterator it
         5: .line 66
      StackMap locals:
      StackMap stack:
            new org.apache.commons.collections4.iterators.PeekingIterator
            dup
            aload 0 /* iterator */
            invokespecial org.apache.commons.collections4.iterators.PeekingIterator.<init>:(Ljava/util/Iterator;)V
            areturn
        end local 0 // java.util.Iterator iterator
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    6     0  iterator  Ljava/util/Iterator<+TE;>;
            4    5     1        it  Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;
    Signature: <E:Ljava/lang/Object;>(Ljava/util/Iterator<+TE;>;)Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;
    MethodParameters:
          Name  Flags
      iterator  final

  public void <init>(java.util.Iterator<? extends E>);
    descriptor: (Ljava/util/Iterator;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
        start local 1 // java.util.Iterator iterator
         0: .line 76
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 38
            aload 0 /* this */
            iconst_0
            putfield org.apache.commons.collections4.iterators.PeekingIterator.exhausted:Z
         2: .line 41
            aload 0 /* this */
            iconst_0
            putfield org.apache.commons.collections4.iterators.PeekingIterator.slotFilled:Z
         3: .line 77
            aload 0 /* this */
            aload 1 /* iterator */
            putfield org.apache.commons.collections4.iterators.PeekingIterator.iterator:Ljava/util/Iterator;
         4: .line 78
            return
        end local 1 // java.util.Iterator iterator
        end local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    5     0      this  Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;
            0    5     1  iterator  Ljava/util/Iterator<+TE;>;
    Signature: (Ljava/util/Iterator<+TE;>;)V
    MethodParameters:
          Name  Flags
      iterator  final

  private void fill();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
         0: .line 81
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.exhausted:Z
            ifne 1
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.slotFilled:Z
            ifeq 2
         1: .line 82
      StackMap locals:
      StackMap stack:
            return
         2: .line 84
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifeq 6
         3: .line 85
            aload 0 /* this */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            putfield org.apache.commons.collections4.iterators.PeekingIterator.slot:Ljava/lang/Object;
         4: .line 86
            aload 0 /* this */
            iconst_1
            putfield org.apache.commons.collections4.iterators.PeekingIterator.slotFilled:Z
         5: .line 87
            goto 9
         6: .line 88
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iconst_1
            putfield org.apache.commons.collections4.iterators.PeekingIterator.exhausted:Z
         7: .line 89
            aload 0 /* this */
            aconst_null
            putfield org.apache.commons.collections4.iterators.PeekingIterator.slot:Ljava/lang/Object;
         8: .line 90
            aload 0 /* this */
            iconst_0
            putfield org.apache.commons.collections4.iterators.PeekingIterator.slotFilled:Z
         9: .line 92
      StackMap locals:
      StackMap stack:
            return
        end local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   10     0  this  Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
         0: .line 97
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.exhausted:Z
            ifeq 2
         1: .line 98
            iconst_0
            ireturn
         2: .line 100
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.slotFilled:Z
            ifne 3
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 3
            iconst_0
            ireturn
      StackMap locals:
      StackMap stack:
         3: iconst_1
            ireturn
        end local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;

  public E peek();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
         0: .line 116
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.iterators.PeekingIterator.fill:()V
         1: .line 117
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.exhausted:Z
            ifeq 2
            aconst_null
            goto 3
      StackMap locals:
      StackMap stack:
         2: aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.slot:Ljava/lang/Object;
      StackMap locals:
      StackMap stack: java.lang.Object
         3: areturn
        end local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;
    Signature: ()TE;

  public E element();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
         0: .line 128
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.iterators.PeekingIterator.fill:()V
         1: .line 129
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.exhausted:Z
            ifeq 3
         2: .line 130
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
         3: .line 132
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.slot:Ljava/lang/Object;
            areturn
        end local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;
    Signature: ()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.PeekingIterator this
         0: .line 137
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.iterators.PeekingIterator.hasNext:()Z
            ifne 2
         1: .line 138
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
         2: .line 140
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.slotFilled:Z
            ifeq 3
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.slot:Ljava/lang/Object;
            goto 4
      StackMap locals:
      StackMap stack:
         3: aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
      StackMap locals:
      StackMap stack: java.lang.Object
         4: astore 1 /* x */
        start local 1 // java.lang.Object x
         5: .line 142
            aload 0 /* this */
            aconst_null
            putfield org.apache.commons.collections4.iterators.PeekingIterator.slot:Ljava/lang/Object;
         6: .line 143
            aload 0 /* this */
            iconst_0
            putfield org.apache.commons.collections4.iterators.PeekingIterator.slotFilled:Z
         7: .line 144
            aload 1 /* x */
            areturn
        end local 1 // java.lang.Object x
        end local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;
            5    8     1     x  TE;
    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.PeekingIterator this
         0: .line 155
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.slotFilled:Z
            ifeq 2
         1: .line 156
            new java.lang.IllegalStateException
            dup
            ldc "peek() or element() called before remove()"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 158
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PeekingIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.remove:()V
         3: .line 159
            return
        end local 0 // org.apache.commons.collections4.iterators.PeekingIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/apache/commons/collections4/iterators/PeekingIterator<TE;>;
}
Signature: <E:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Iterator<TE;>;
SourceFile: "PeekingIterator.java"