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 
final class org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet<T> extends org.eclipse.collections.impl.set.immutable.AbstractImmutableSet<T> implements java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet
  super_class: org.eclipse.collections.impl.set.immutable.AbstractImmutableSet
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  private final T element1;
    descriptor: Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: TT;

  void <init>();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
        start local 1 // java.lang.Object obj1
         0: .line 33
            aload 0 /* this */
            invokespecial org.eclipse.collections.impl.set.immutable.AbstractImmutableSet.<init>:()V
         1: .line 35
            aload 0 /* this */
            aload 1 /* obj1 */
            putfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
         2: .line 36
            return
        end local 1 // java.lang.Object obj1
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
            0    3     1  obj1  TT;
    Signature: (TT;)V
    MethodParameters:
      Name  Flags
      obj1  

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
         0: .line 41
            iconst_1
            ireturn
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;

  public boolean equals(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
        start local 1 // java.lang.Object other
         0: .line 47
            aload 1 /* other */
            aload 0 /* this */
            if_acmpne 2
         1: .line 49
            iconst_1
            ireturn
         2: .line 51
      StackMap locals:
      StackMap stack:
            aload 1 /* other */
            instanceof java.util.Set
            ifne 4
         3: .line 53
            iconst_0
            ireturn
         4: .line 55
      StackMap locals:
      StackMap stack:
            aload 1 /* other */
            checkcast java.util.Set
            astore 2 /* set */
        start local 2 // java.util.Set set
         5: .line 56
            aload 2 /* set */
            invokeinterface java.util.Set.size:()I
            aload 0 /* this */
            invokevirtual org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.size:()I
            if_icmpne 6
            aload 2 /* set */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            invokeinterface java.util.Set.contains:(Ljava/lang/Object;)Z
            ifeq 6
            iconst_1
            ireturn
      StackMap locals: java.util.Set
      StackMap stack:
         6: iconst_0
            ireturn
        end local 2 // java.util.Set set
        end local 1 // java.lang.Object other
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    7     0   this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
            0    7     1  other  Ljava/lang/Object;
            5    7     2    set  Ljava/util/Set<*>;
    MethodParameters:
       Name  Flags
      other  

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
         0: .line 62
            aload 0 /* this */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            invokevirtual org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.nullSafeHashCode:(Ljava/lang/Object;)I
            ireturn
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;

  public org.eclipse.collections.api.set.ImmutableSet<T> newWith(T);
    descriptor: (Ljava/lang/Object;)Lorg/eclipse/collections/api/set/ImmutableSet;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
        start local 1 // java.lang.Object element
         0: .line 68
            aload 0 /* this */
            aload 1 /* element */
            invokevirtual org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.contains:(Ljava/lang/Object;)Z
            ifne 2
         1: .line 70
            getstatic org.eclipse.collections.api.factory.Sets.immutable:Lorg/eclipse/collections/api/factory/set/ImmutableSetFactory;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            aload 1 /* element */
            invokeinterface org.eclipse.collections.api.factory.set.ImmutableSetFactory.with:(Ljava/lang/Object;Ljava/lang/Object;)Lorg/eclipse/collections/api/set/ImmutableSet;
            areturn
         2: .line 72
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            areturn
        end local 1 // java.lang.Object element
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
            0    3     1  element  TT;
    Signature: (TT;)Lorg/eclipse/collections/api/set/ImmutableSet<TT;>;
    MethodParameters:
         Name  Flags
      element  

  public org.eclipse.collections.api.set.ImmutableSet<T> newWithout(T);
    descriptor: (Ljava/lang/Object;)Lorg/eclipse/collections/api/set/ImmutableSet;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
        start local 1 // java.lang.Object element
         0: .line 78
            aload 0 /* this */
            aload 1 /* element */
            invokevirtual org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.contains:(Ljava/lang/Object;)Z
            ifeq 2
         1: .line 80
            getstatic org.eclipse.collections.api.factory.Sets.immutable:Lorg/eclipse/collections/api/factory/set/ImmutableSetFactory;
            invokeinterface org.eclipse.collections.api.factory.set.ImmutableSetFactory.empty:()Lorg/eclipse/collections/api/set/ImmutableSet;
            areturn
         2: .line 82
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            areturn
        end local 1 // java.lang.Object element
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
            0    3     1  element  TT;
    Signature: (TT;)Lorg/eclipse/collections/api/set/ImmutableSet<TT;>;
    MethodParameters:
         Name  Flags
      element  

  public boolean contains(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
        start local 1 // java.lang.Object obj
         0: .line 88
            aload 1 /* obj */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            invokestatic java.util.Objects.equals:(Ljava/lang/Object;Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object obj
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
            0    1     1   obj  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      obj   

  public java.util.Iterator<T> iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
         0: .line 94
            new org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet$SingletonSetIterator
            dup
            aload 0 /* this */
            invokespecial org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet$SingletonSetIterator.<init>:(Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet;)V
            areturn
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
    Signature: ()Ljava/util/Iterator<TT;>;

  public T getFirst();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
         0: .line 114
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
    Signature: ()TT;

  public T getLast();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
         0: .line 120
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
    Signature: ()TT;

  public T getOnly();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
         0: .line 126
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
    Signature: ()TT;

  public void each(org.eclipse.collections.api.block.procedure.Procedure<? super T>);
    descriptor: (Lorg/eclipse/collections/api/block/procedure/Procedure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
        start local 1 // org.eclipse.collections.api.block.procedure.Procedure procedure
         0: .line 132
            aload 1 /* procedure */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            invokeinterface org.eclipse.collections.api.block.procedure.Procedure.value:(Ljava/lang/Object;)V
         1: .line 133
            return
        end local 1 // org.eclipse.collections.api.block.procedure.Procedure procedure
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
            0    2     1  procedure  Lorg/eclipse/collections/api/block/procedure/Procedure<-TT;>;
    Signature: (Lorg/eclipse/collections/api/block/procedure/Procedure<-TT;>;)V
    MethodParameters:
           Name  Flags
      procedure  

  public void forEachWithIndex(org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure<? super T>);
    descriptor: (Lorg/eclipse/collections/api/block/procedure/primitive/ObjectIntProcedure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
        start local 1 // org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure objectIntProcedure
         0: .line 138
            aload 1 /* objectIntProcedure */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            iconst_0
            invokeinterface org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure.value:(Ljava/lang/Object;I)V
         1: .line 139
            return
        end local 1 // org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure objectIntProcedure
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    2     0                this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
            0    2     1  objectIntProcedure  Lorg/eclipse/collections/api/block/procedure/primitive/ObjectIntProcedure<-TT;>;
    Signature: (Lorg/eclipse/collections/api/block/procedure/primitive/ObjectIntProcedure<-TT;>;)V
    MethodParameters:
                    Name  Flags
      objectIntProcedure  

  public <P> void forEachWith(org.eclipse.collections.api.block.procedure.Procedure2<? super T, ? super P>, );
    descriptor: (Lorg/eclipse/collections/api/block/procedure/Procedure2;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
        start local 1 // org.eclipse.collections.api.block.procedure.Procedure2 procedure
        start local 2 // java.lang.Object parameter
         0: .line 144
            aload 1 /* procedure */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.element1:Ljava/lang/Object;
            aload 2 /* parameter */
            invokeinterface org.eclipse.collections.api.block.procedure.Procedure2.value:(Ljava/lang/Object;Ljava/lang/Object;)V
         1: .line 145
            return
        end local 2 // java.lang.Object parameter
        end local 1 // org.eclipse.collections.api.block.procedure.Procedure2 procedure
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;
            0    2     1  procedure  Lorg/eclipse/collections/api/block/procedure/Procedure2<-TT;-TP;>;
            0    2     2  parameter  TP;
    Signature: <P:Ljava/lang/Object;>(Lorg/eclipse/collections/api/block/procedure/Procedure2<-TT;-TP;>;TP;)V
    MethodParameters:
           Name  Flags
      procedure  
      parameter  

  private java.lang.Object writeReplace();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
         0: .line 149
            new org.eclipse.collections.impl.set.immutable.ImmutableSetSerializationProxy
            dup
            aload 0 /* this */
            invokespecial org.eclipse.collections.impl.set.immutable.ImmutableSetSerializationProxy.<init>:(Lorg/eclipse/collections/api/set/ImmutableSet;)V
            areturn
        end local 0 // org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/ImmutableSingletonSet<TT;>;

  public org.eclipse.collections.api.collection.ImmutableCollection newWithout(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Lorg/eclipse/collections/api/collection/ImmutableCollection;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Object
            invokevirtual org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.newWithout:(Ljava/lang/Object;)Lorg/eclipse/collections/api/set/ImmutableSet;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public org.eclipse.collections.api.collection.ImmutableCollection newWith(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Lorg/eclipse/collections/api/collection/ImmutableCollection;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Object
            invokevirtual org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet.newWith:(Ljava/lang/Object;)Lorg/eclipse/collections/api/set/ImmutableSet;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <T:Ljava/lang/Object;>Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet<TT;>;Ljava/io/Serializable;
SourceFile: "ImmutableSingletonSet.java"
NestMembers:
  org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet$SingletonSetIterator
InnerClasses:
  private SingletonSetIterator = org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet$SingletonSetIterator of org.eclipse.collections.impl.set.immutable.ImmutableSingletonSet