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
  • Max Rydahl Andersen
  • Avalon
  • Federico Barbieri
  • Jeffrey Barnes
  • Nicola Ken Barozzi
  • Arron Bates
  • Sebastian Bazley
  • Benjamin Bentmann
  • Ola Berg
  • Sam Berlin
  • Christopher Berry
  • Nathan Beyer
  • Rune Peter Bjørnstad
  • Janek Bogucki
  • Maarten Brak
  • Dave Bryson
  • Chuck Burdick
  • Julien Buret
  • Josh Cain
  • Jonathan Carlson
  • Ram Chidambaram
  • Steve Clark
  • Benoit Corne
  • Eric Crampton
  • Dimiter Dimitrov
  • Peter Donald
  • Steve Downey
  • Rich Dougherty
  • Tom Dunham
  • Stefano Fornari
  • Andrew Freeman
  • Gerhard Froehlich
  • Goran Hacek
  • David Hay
  • Mario Ivankovits
  • Paul Jack
  • Eric Johnson
  • Kent Johnson
  • Marc Johnson
  • Roger Kapsi
  • Nissim Karpenstein
  • Shinobu Kawai
  • Stephen Kestle
  • Mohan Kishore
  • Simon Kitching
  • Thomas Knych
  • Serge Knystautas
  • Peter KoBek
  • Jordan Krey
  • Olaf Krische
  • Guilhem Lavaux
  • Paul Legato
  • David Leppik
  • Berin Loritsch
  • Hendrik Maryns
  • Stefano Mazzocchi
  • Brian McCallister
  • David Meikle
  • Steven Melzer
  • Leon Messerschmidt
  • Mauricio S. Moura
  • Kasper Nielsen
  • Stanislaw Osinski
  • Alban Peignier
  • Mike Pettypiece
  • Steve Phelps
  • Ilkka Priha
  • Jonas Van Poucke
  • Will Pugh
  • Herve Quiroz
  • Daniel Rall
  • Robert Ribnitz
  • Huw Roberts
  • Henning P. Schmiedehausen
  • Joerg Schmuecker
  • Howard Lewis Ship
  • Joe Raysa
  • Jeff Rodriguez
  • Ashwin S
  • Jordane Sarda
  • Thomas Schapitz
  • Jon Schewe
  • Andreas Schlosser
  • Christian Siefkes
  • Michael Smith
  • Stephen Smith
  • Jan Sorensen
  • Jon S. Stevens
  • James Strachan
  • Leo Sutic
  • Radford Tam
  • Chris Tilden
  • Neil O'Toole
  • Jeff Turner
  • Kazuya Ujihara
  • Thomas Vahrst
  • Jeff Varszegi
  • Ralph Wagner
  • Hollis Waite
  • David Weinrich
  • Dieter Wimberger
  • Serhiy Yevtushenko
  • Sai Zhang
  • Jason van Zyl
  • Geoff Schoeman
  • Goncalo Marques
  • Vamsi Kavuri
  • Matt Benson
  • James Carman
  • Stephen Colebourne
  • Robert Burrell Donkin
  • Morgan Delagrange
  • Gary Gregory
  • Matthew Hawthorne
  • Dipanjan Laha
  • Geir Magnusson
  • Luc Maisonobe
  • Craig McClanahan
  • Thomas Neidhart
  • Adrian Nistor
  • Arun M. Thomas
  • Rodney Waldhoff
  • Henri Yandell
  • Rob Tompkins 
public class org.apache.commons.collections4.iterators.PermutationIterator<E> implements java.util.Iterator<java.util.List<E>>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.commons.collections4.iterators.PermutationIterator
  super_class: java.lang.Object
{
  private final int[] keys;
    descriptor: [I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.util.Map<java.lang.Integer, E> objectMap;
    descriptor: Ljava/util/Map;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/Integer;TE;>;

  private final boolean[] direction;
    descriptor: [Z
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private java.util.List<E> nextPermutation;
    descriptor: Ljava/util/List;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/List<TE;>;

  public void <init>(java.util.Collection<? extends E>);
    descriptor: (Ljava/util/Collection;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=5, args_size=2
        start local 0 // org.apache.commons.collections4.iterators.PermutationIterator this
        start local 1 // java.util.Collection coll
         0: .line 75
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 76
            aload 1 /* coll */
            ifnonnull 3
         2: .line 77
            new java.lang.NullPointerException
            dup
            ldc "The collection must not be null"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 80
      StackMap locals: org.apache.commons.collections4.iterators.PermutationIterator java.util.Collection
      StackMap stack:
            aload 0 /* this */
            aload 1 /* coll */
            invokeinterface java.util.Collection.size:()I
            newarray 10
            putfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
         4: .line 81
            aload 0 /* this */
            aload 1 /* coll */
            invokeinterface java.util.Collection.size:()I
            newarray 4
            putfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
         5: .line 82
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iconst_0
            invokestatic java.util.Arrays.fill:([ZZ)V
         6: .line 83
            iconst_1
            istore 2 /* value */
        start local 2 // int value
         7: .line 84
            aload 0 /* this */
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            putfield org.apache.commons.collections4.iterators.PermutationIterator.objectMap:Ljava/util/Map;
         8: .line 85
            aload 1 /* coll */
            invokeinterface java.util.Collection.iterator:()Ljava/util/Iterator;
            astore 4
            goto 13
      StackMap locals: org.apache.commons.collections4.iterators.PermutationIterator java.util.Collection int top java.util.Iterator
      StackMap stack:
         9: aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.Object
            astore 3 /* e */
        start local 3 // java.lang.Object e
        10: .line 86
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.objectMap:Ljava/util/Map;
            iload 2 /* value */
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            aload 3 /* e */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
        11: .line 87
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 2 /* value */
            iconst_1
            isub
            iload 2 /* value */
            iastore
        12: .line 88
            iinc 2 /* value */ 1
        end local 3 // java.lang.Object e
        13: .line 85
      StackMap locals:
      StackMap stack:
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 9
        14: .line 90
            aload 0 /* this */
            new java.util.ArrayList
            dup
            aload 1 /* coll */
            invokespecial java.util.ArrayList.<init>:(Ljava/util/Collection;)V
            putfield org.apache.commons.collections4.iterators.PermutationIterator.nextPermutation:Ljava/util/List;
        15: .line 91
            return
        end local 2 // int value
        end local 1 // java.util.Collection coll
        end local 0 // org.apache.commons.collections4.iterators.PermutationIterator this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0   16     0   this  Lorg/apache/commons/collections4/iterators/PermutationIterator<TE;>;
            0   16     1   coll  Ljava/util/Collection<+TE;>;
            7   16     2  value  I
           10   13     3      e  TE;
    Signature: (Ljava/util/Collection<+TE;>;)V
    MethodParameters:
      Name  Flags
      coll  final

  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.PermutationIterator this
         0: .line 99
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.nextPermutation:Ljava/util/List;
            ifnull 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // org.apache.commons.collections4.iterators.PermutationIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/commons/collections4/iterators/PermutationIterator<TE;>;

  public java.util.List<E> next();
    descriptor: ()Ljava/util/List;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=8, args_size=1
        start local 0 // org.apache.commons.collections4.iterators.PermutationIterator this
         0: .line 109
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.iterators.PermutationIterator.hasNext:()Z
            ifne 2
         1: .line 110
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
         2: .line 114
      StackMap locals:
      StackMap stack:
            iconst_m1
            istore 1 /* indexOfLargestMobileInteger */
        start local 1 // int indexOfLargestMobileInteger
         3: .line 115
            iconst_m1
            istore 2 /* largestKey */
        start local 2 // int largestKey
         4: .line 116
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         5: goto 12
         6: .line 117
      StackMap locals: int int int
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 3 /* i */
            baload
            ifeq 7
            iload 3 /* i */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            arraylength
            iconst_1
            isub
            if_icmpge 7
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 3 /* i */
            iaload
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 3 /* i */
            iconst_1
            iadd
            iaload
            if_icmpgt 8
         7: .line 118
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 3 /* i */
            baload
            ifne 11
            iload 3 /* i */
            ifle 11
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 3 /* i */
            iaload
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 3 /* i */
            iconst_1
            isub
            iaload
            if_icmple 11
         8: .line 119
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 3 /* i */
            iaload
            iload 2 /* largestKey */
            if_icmple 11
         9: .line 120
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 3 /* i */
            iaload
            istore 2 /* largestKey */
        10: .line 121
            iload 3 /* i */
            istore 1 /* indexOfLargestMobileInteger */
        11: .line 116
      StackMap locals:
      StackMap stack:
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
        12: iload 3 /* i */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            arraylength
            if_icmplt 6
        end local 3 // int i
        13: .line 125
            iload 2 /* largestKey */
            iconst_m1
            if_icmpne 17
        14: .line 126
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.nextPermutation:Ljava/util/List;
            astore 3 /* toReturn */
        start local 3 // java.util.List toReturn
        15: .line 127
            aload 0 /* this */
            aconst_null
            putfield org.apache.commons.collections4.iterators.PermutationIterator.nextPermutation:Ljava/util/List;
        16: .line 128
            aload 3 /* toReturn */
            areturn
        end local 3 // java.util.List toReturn
        17: .line 132
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 1 /* indexOfLargestMobileInteger */
            baload
            ifeq 18
            iconst_1
            goto 19
      StackMap locals:
      StackMap stack:
        18: iconst_m1
      StackMap locals:
      StackMap stack: int
        19: istore 3 /* offset */
        start local 3 // int offset
        20: .line 133
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 1 /* indexOfLargestMobileInteger */
            iaload
            istore 4 /* tmpKey */
        start local 4 // int tmpKey
        21: .line 134
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 1 /* indexOfLargestMobileInteger */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 1 /* indexOfLargestMobileInteger */
            iload 3 /* offset */
            iadd
            iaload
            iastore
        22: .line 135
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 1 /* indexOfLargestMobileInteger */
            iload 3 /* offset */
            iadd
            iload 4 /* tmpKey */
            iastore
        23: .line 136
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 1 /* indexOfLargestMobileInteger */
            baload
            istore 5 /* tmpDirection */
        start local 5 // boolean tmpDirection
        24: .line 137
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 1 /* indexOfLargestMobileInteger */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 1 /* indexOfLargestMobileInteger */
            iload 3 /* offset */
            iadd
            baload
            bastore
        25: .line 138
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 1 /* indexOfLargestMobileInteger */
            iload 3 /* offset */
            iadd
            iload 5 /* tmpDirection */
            bastore
        26: .line 141
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            astore 6 /* nextP */
        start local 6 // java.util.List nextP
        27: .line 142
            iconst_0
            istore 7 /* i */
        start local 7 // int i
        28: goto 35
        29: .line 143
      StackMap locals: org.apache.commons.collections4.iterators.PermutationIterator int int int int int java.util.List int
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 7 /* i */
            iaload
            iload 2 /* largestKey */
            if_icmple 33
        30: .line 144
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 7 /* i */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.direction:[Z
            iload 7 /* i */
            baload
            ifeq 31
            iconst_0
            goto 32
      StackMap locals: org.apache.commons.collections4.iterators.PermutationIterator int int int int int java.util.List int
      StackMap stack: boolean[] int
        31: iconst_1
      StackMap locals: org.apache.commons.collections4.iterators.PermutationIterator int int int int int java.util.List int
      StackMap stack: boolean[] int int
        32: bastore
        33: .line 146
      StackMap locals:
      StackMap stack:
            aload 6 /* nextP */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.objectMap:Ljava/util/Map;
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            iload 7 /* i */
            iaload
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        34: .line 142
            iinc 7 /* i */ 1
      StackMap locals:
      StackMap stack:
        35: iload 7 /* i */
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.keys:[I
            arraylength
            if_icmplt 29
        end local 7 // int i
        36: .line 148
            aload 0 /* this */
            getfield org.apache.commons.collections4.iterators.PermutationIterator.nextPermutation:Ljava/util/List;
            astore 7 /* result */
        start local 7 // java.util.List result
        37: .line 149
            aload 0 /* this */
            aload 6 /* nextP */
            putfield org.apache.commons.collections4.iterators.PermutationIterator.nextPermutation:Ljava/util/List;
        38: .line 150
            aload 7 /* result */
            areturn
        end local 7 // java.util.List result
        end local 6 // java.util.List nextP
        end local 5 // boolean tmpDirection
        end local 4 // int tmpKey
        end local 3 // int offset
        end local 2 // int largestKey
        end local 1 // int indexOfLargestMobileInteger
        end local 0 // org.apache.commons.collections4.iterators.PermutationIterator this
      LocalVariableTable:
        Start  End  Slot                         Name  Signature
            0   39     0                         this  Lorg/apache/commons/collections4/iterators/PermutationIterator<TE;>;
            3   39     1  indexOfLargestMobileInteger  I
            4   39     2                   largestKey  I
            5   13     3                            i  I
           15   17     3                     toReturn  Ljava/util/List<TE;>;
           20   39     3                       offset  I
           21   39     4                       tmpKey  I
           24   39     5                 tmpDirection  Z
           27   39     6                        nextP  Ljava/util/List<TE;>;
           28   36     7                            i  I
           37   39     7                       result  Ljava/util/List<TE;>;
    Signature: ()Ljava/util/List<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.PermutationIterator this
         0: .line 155
            new java.lang.UnsupportedOperationException
            dup
            ldc "remove() is not supported"
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // org.apache.commons.collections4.iterators.PermutationIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/commons/collections4/iterators/PermutationIterator<TE;>;

  public java.lang.Object next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual org.apache.commons.collections4.iterators.PermutationIterator.next:()Ljava/util/List;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <E:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Iterator<Ljava/util/List<TE;>;>;
SourceFile: "PermutationIterator.java"