https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
final class com.google.common.collect.RegularImmutableSet<E> extends com.google.common.collect.ImmutableSet<E>
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.collect.RegularImmutableSet
  super_class: com.google.common.collect.ImmutableSet
{
  static final com.google.common.collect.RegularImmutableSet<java.lang.Object> EMPTY;
    descriptor: Lcom/google/common/collect/RegularImmutableSet;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    Signature: Lcom/google/common/collect/RegularImmutableSet<Ljava/lang/Object;>;

  private final transient java.lang.Object[] elements;
    descriptor: [Ljava/lang/Object;
    flags: (0x0092) ACC_PRIVATE, ACC_FINAL, ACC_TRANSIENT

  final transient java.lang.Object[] table;
    descriptor: [Ljava/lang/Object;
    flags: (0x0090) ACC_FINAL, ACC_TRANSIENT
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.VisibleForTesting()

  private final transient int mask;
    descriptor: I
    flags: (0x0092) ACC_PRIVATE, ACC_FINAL, ACC_TRANSIENT

  private final transient int hashCode;
    descriptor: I
    flags: (0x0092) ACC_PRIVATE, ACC_FINAL, ACC_TRANSIENT

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=6, locals=0, args_size=0
         0: .line 34
            new com.google.common.collect.RegularImmutableSet
            dup
            iconst_0
            anewarray java.lang.Object
            iconst_0
            aconst_null
            iconst_0
            invokespecial com.google.common.collect.RegularImmutableSet.<init>:([Ljava/lang/Object;I[Ljava/lang/Object;I)V
         1: .line 33
            putstatic com.google.common.collect.RegularImmutableSet.EMPTY:Lcom/google/common/collect/RegularImmutableSet;
         2: .line 34
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  void <init>(java.lang.Object[], int, java.lang.Object[], int);
    descriptor: ([Ljava/lang/Object;I[Ljava/lang/Object;I)V
    flags: (0x0000) 
    Code:
      stack=2, locals=5, args_size=5
        start local 0 // com.google.common.collect.RegularImmutableSet this
        start local 1 // java.lang.Object[] elements
        start local 2 // int hashCode
        start local 3 // java.lang.Object[] table
        start local 4 // int mask
         0: .line 43
            aload 0 /* this */
            invokespecial com.google.common.collect.ImmutableSet.<init>:()V
         1: .line 44
            aload 0 /* this */
            aload 1 /* elements */
            putfield com.google.common.collect.RegularImmutableSet.elements:[Ljava/lang/Object;
         2: .line 45
            aload 0 /* this */
            aload 3 /* table */
            putfield com.google.common.collect.RegularImmutableSet.table:[Ljava/lang/Object;
         3: .line 46
            aload 0 /* this */
            iload 4 /* mask */
            putfield com.google.common.collect.RegularImmutableSet.mask:I
         4: .line 47
            aload 0 /* this */
            iload 2 /* hashCode */
            putfield com.google.common.collect.RegularImmutableSet.hashCode:I
         5: .line 48
            return
        end local 4 // int mask
        end local 3 // java.lang.Object[] table
        end local 2 // int hashCode
        end local 1 // java.lang.Object[] elements
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    6     0      this  Lcom/google/common/collect/RegularImmutableSet<TE;>;
            0    6     1  elements  [Ljava/lang/Object;
            0    6     2  hashCode  I
            0    6     3     table  [Ljava/lang/Object;
            0    6     4      mask  I
    MethodParameters:
          Name  Flags
      elements  
      hashCode  
      table     
      mask      

  public boolean contains(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=5, args_size=2
        start local 0 // com.google.common.collect.RegularImmutableSet this
        start local 1 // java.lang.Object target
         0: .line 52
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.table:[Ljava/lang/Object;
            astore 2 /* table */
        start local 2 // java.lang.Object[] table
         1: .line 53
            aload 1 /* target */
            ifnull 2
            aload 2 /* table */
            ifnonnull 3
         2: .line 54
      StackMap locals: java.lang.Object[]
      StackMap stack:
            iconst_0
            ireturn
         3: .line 56
      StackMap locals:
      StackMap stack:
            aload 1 /* target */
            invokestatic com.google.common.collect.Hashing.smearedHash:(Ljava/lang/Object;)I
            istore 3 /* i */
        start local 3 // int i
         4: .line 57
      StackMap locals: int
      StackMap stack:
            iload 3 /* i */
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.mask:I
            iand
            istore 3 /* i */
         5: .line 58
            aload 2 /* table */
            iload 3 /* i */
            aaload
            astore 4 /* candidate */
        start local 4 // java.lang.Object candidate
         6: .line 59
            aload 4 /* candidate */
            ifnonnull 8
         7: .line 60
            iconst_0
            ireturn
         8: .line 61
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 4 /* candidate */
            aload 1 /* target */
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifeq 10
         9: .line 62
            iconst_1
            ireturn
        end local 4 // java.lang.Object candidate
        10: .line 56
      StackMap locals:
      StackMap stack:
            iinc 3 /* i */ 1
            goto 4
        end local 3 // int i
        end local 2 // java.lang.Object[] table
        end local 1 // java.lang.Object target
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0   11     0       this  Lcom/google/common/collect/RegularImmutableSet<TE;>;
            0   11     1     target  Ljava/lang/Object;
            1   11     2      table  [Ljava/lang/Object;
            4   11     3          i  I
            6   10     4  candidate  Ljava/lang/Object;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
        Name  Flags
      target  

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.RegularImmutableSet this
         0: .line 69
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.elements:[Ljava/lang/Object;
            arraylength
            ireturn
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/RegularImmutableSet<TE;>;

  public com.google.common.collect.UnmodifiableIterator<E> iterator();
    descriptor: ()Lcom/google/common/collect/UnmodifiableIterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.RegularImmutableSet this
         0: .line 74
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.elements:[Ljava/lang/Object;
            invokestatic com.google.common.collect.Iterators.forArray:([Ljava/lang/Object;)Lcom/google/common/collect/UnmodifiableIterator;
            areturn
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/RegularImmutableSet<TE;>;
    Signature: ()Lcom/google/common/collect/UnmodifiableIterator<TE;>;

  public java.util.Spliterator<E> spliterator();
    descriptor: ()Ljava/util/Spliterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.collect.RegularImmutableSet this
         0: .line 79
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.elements:[Ljava/lang/Object;
            sipush 1297
            invokestatic java.util.Spliterators.spliterator:([Ljava/lang/Object;I)Ljava/util/Spliterator;
            areturn
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/RegularImmutableSet<TE;>;
    Signature: ()Ljava/util/Spliterator<TE;>;

  int copyIntoArray(java.lang.Object[], int);
    descriptor: ([Ljava/lang/Object;I)I
    flags: (0x0000) 
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // com.google.common.collect.RegularImmutableSet this
        start local 1 // java.lang.Object[] dst
        start local 2 // int offset
         0: .line 84
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.elements:[Ljava/lang/Object;
            iconst_0
            aload 1 /* dst */
            iload 2 /* offset */
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.elements:[Ljava/lang/Object;
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         1: .line 85
            iload 2 /* offset */
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.elements:[Ljava/lang/Object;
            arraylength
            iadd
            ireturn
        end local 2 // int offset
        end local 1 // java.lang.Object[] dst
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lcom/google/common/collect/RegularImmutableSet<TE;>;
            0    2     1     dst  [Ljava/lang/Object;
            0    2     2  offset  I
    MethodParameters:
        Name  Flags
      dst     
      offset  

  com.google.common.collect.ImmutableList<E> createAsList();
    descriptor: ()Lcom/google/common/collect/ImmutableList;
    flags: (0x0000) 
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // com.google.common.collect.RegularImmutableSet this
         0: .line 90
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.table:[Ljava/lang/Object;
            ifnonnull 1
            invokestatic com.google.common.collect.ImmutableList.of:()Lcom/google/common/collect/ImmutableList;
            goto 2
      StackMap locals:
      StackMap stack:
         1: new com.google.common.collect.RegularImmutableAsList
            dup
            aload 0 /* this */
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.elements:[Ljava/lang/Object;
            invokespecial com.google.common.collect.RegularImmutableAsList.<init>:(Lcom/google/common/collect/ImmutableCollection;[Ljava/lang/Object;)V
      StackMap locals:
      StackMap stack: com.google.common.collect.ImmutableList
         2: areturn
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/google/common/collect/RegularImmutableSet<TE;>;
    Signature: ()Lcom/google/common/collect/ImmutableList<TE;>;

  boolean isPartialView();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.RegularImmutableSet this
         0: .line 95
            iconst_0
            ireturn
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/RegularImmutableSet<TE;>;

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.RegularImmutableSet this
         0: .line 100
            aload 0 /* this */
            getfield com.google.common.collect.RegularImmutableSet.hashCode:I
            ireturn
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/RegularImmutableSet<TE;>;

  boolean isHashCodeFast();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.RegularImmutableSet this
         0: .line 105
            iconst_1
            ireturn
        end local 0 // com.google.common.collect.RegularImmutableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/RegularImmutableSet<TE;>;

  public java.util.Iterator iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual com.google.common.collect.RegularImmutableSet.iterator:()Lcom/google/common/collect/UnmodifiableIterator;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <E:Ljava/lang/Object;>Lcom/google/common/collect/ImmutableSet<TE;>;
SourceFile: "RegularImmutableSet.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible(serializable = true, emulated = true)