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 
public class org.eclipse.collections.impl.UnmodifiableMap<K, V> implements java.util.Map<K, V>, java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.eclipse.collections.impl.UnmodifiableMap
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  protected final java.util.Map<K, V> delegate;
    descriptor: Ljava/util/Map;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Signature: Ljava/util/Map<TK;TV;>;

  public void <init>(java.util.Map<K, V>);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
        start local 1 // java.util.Map delegate
         0: .line 28
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 30
            aload 1 /* delegate */
            ifnonnull 3
         2: .line 32
            new java.lang.NullPointerException
            dup
            invokespecial java.lang.NullPointerException.<init>:()V
            athrow
         3: .line 34
      StackMap locals: org.eclipse.collections.impl.UnmodifiableMap java.util.Map
      StackMap stack:
            aload 0 /* this */
            aload 1 /* delegate */
            putfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
         4: .line 35
            return
        end local 1 // java.util.Map delegate
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    5     0      this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
            0    5     1  delegate  Ljava/util/Map<TK;TV;>;
    Signature: (Ljava/util/Map<TK;TV;>;)V
    MethodParameters:
          Name  Flags
      delegate  

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
         0: .line 40
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            invokeinterface java.util.Map.size:()I
            ireturn
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;

  public boolean isEmpty();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
         0: .line 46
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            invokeinterface java.util.Map.isEmpty:()Z
            ireturn
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;

  public boolean containsKey(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.UnmodifiableMap this
        start local 1 // java.lang.Object key
         0: .line 52
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object key
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
            0    1     1   key  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      key   

  public boolean containsValue(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.UnmodifiableMap this
        start local 1 // java.lang.Object value
         0: .line 58
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            aload 1 /* value */
            invokeinterface java.util.Map.containsValue:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object value
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
            0    1     1  value  Ljava/lang/Object;
    MethodParameters:
       Name  Flags
      value  

  public V get();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
        start local 1 // java.lang.Object key
         0: .line 64
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.Object key
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
            0    1     1   key  Ljava/lang/Object;
    Signature: (Ljava/lang/Object;)TV;
    MethodParameters:
      Name  Flags
      key   

  public V put(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
        start local 1 // java.lang.Object key
        start local 2 // java.lang.Object value
         0: .line 70
            new java.lang.UnsupportedOperationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Cannot call put() on "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getSimpleName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 2 // java.lang.Object value
        end local 1 // java.lang.Object key
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
            0    1     1    key  TK;
            0    1     2  value  TV;
    Signature: (TK;TV;)TV;
    MethodParameters:
       Name  Flags
      key    
      value  

  public V remove();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
        start local 1 // java.lang.Object key
         0: .line 76
            new java.lang.UnsupportedOperationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Cannot call remove() on "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getSimpleName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.lang.Object key
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
            0    1     1   key  Ljava/lang/Object;
    Signature: (Ljava/lang/Object;)TV;
    MethodParameters:
      Name  Flags
      key   

  public void putAll(java.util.Map<? extends K, ? extends V>);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
        start local 1 // java.util.Map t
         0: .line 82
            new java.lang.UnsupportedOperationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Cannot call putAll() on "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getSimpleName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.util.Map t
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
            0    1     1     t  Ljava/util/Map<+TK;+TV;>;
    Signature: (Ljava/util/Map<+TK;+TV;>;)V
    MethodParameters:
      Name  Flags
      t     

  public void clear();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
         0: .line 88
            new java.lang.UnsupportedOperationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Cannot call clear() on "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getSimpleName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;

  public java.util.Set<K> keySet();
    descriptor: ()Ljava/util/Set;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
         0: .line 94
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            invokeinterface java.util.Map.keySet:()Ljava/util/Set;
            invokestatic java.util.Collections.unmodifiableSet:(Ljava/util/Set;)Ljava/util/Set;
            areturn
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
    Signature: ()Ljava/util/Set<TK;>;

  public java.util.Set<java.util.Map$Entry<K, V>> entrySet();
    descriptor: ()Ljava/util/Set;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
         0: .line 100
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            invokestatic java.util.Collections.unmodifiableMap:(Ljava/util/Map;)Ljava/util/Map;
            invokeinterface java.util.Map.entrySet:()Ljava/util/Set;
            areturn
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
    Signature: ()Ljava/util/Set<Ljava/util/Map$Entry<TK;TV;>;>;

  public java.util.Collection<V> values();
    descriptor: ()Ljava/util/Collection;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
         0: .line 106
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            invokeinterface java.util.Map.values:()Ljava/util/Collection;
            invokestatic java.util.Collections.unmodifiableCollection:(Ljava/util/Collection;)Ljava/util/Collection;
            areturn
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
    Signature: ()Ljava/util/Collection<TV;>;

  public boolean equals(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.UnmodifiableMap this
        start local 1 // java.lang.Object o
         0: .line 112
            aload 1 /* o */
            aload 0 /* this */
            if_acmpeq 1
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            aload 1 /* o */
            invokeinterface java.util.Map.equals:(Ljava/lang/Object;)Z
            ifne 1
            iconst_0
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_1
            ireturn
        end local 1 // java.lang.Object o
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
            0    2     1     o  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      o     

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
         0: .line 118
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            invokeinterface java.util.Map.hashCode:()I
            ireturn
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.UnmodifiableMap this
         0: .line 124
            aload 0 /* this */
            getfield org.eclipse.collections.impl.UnmodifiableMap.delegate:Ljava/util/Map;
            invokevirtual java.lang.Object.toString:()Ljava/lang/String;
            areturn
        end local 0 // org.eclipse.collections.impl.UnmodifiableMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/UnmodifiableMap<TK;TV;>;
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Map<TK;TV;>;Ljava/io/Serializable;
SourceFile: "UnmodifiableMap.java"
InnerClasses:
  public abstract Entry = java.util.Map$Entry of java.util.Map