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

  private static final org.eclipse.collections.impl.tuple.AbstractImmutableEntry$PairFunction<?, ?> TO_PAIR;
    descriptor: Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry$PairFunction;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    Signature: Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry$PairFunction<**>;

  protected final K key;
    descriptor: Ljava/lang/Object;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Signature: TK;

  protected final V value;
    descriptor: Ljava/lang/Object;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Signature: TV;

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 23
            new org.eclipse.collections.impl.tuple.AbstractImmutableEntry$PairFunction
            dup
            invokespecial org.eclipse.collections.impl.tuple.AbstractImmutableEntry$PairFunction.<init>:()V
            putstatic org.eclipse.collections.impl.tuple.AbstractImmutableEntry.TO_PAIR:Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry$PairFunction;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
        start local 1 // java.lang.Object key
        start local 2 // java.lang.Object value
         0: .line 28
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 30
            aload 0 /* this */
            aload 1 /* key */
            putfield org.eclipse.collections.impl.tuple.AbstractImmutableEntry.key:Ljava/lang/Object;
         2: .line 31
            aload 0 /* this */
            aload 2 /* value */
            putfield org.eclipse.collections.impl.tuple.AbstractImmutableEntry.value:Ljava/lang/Object;
         3: .line 32
            return
        end local 2 // java.lang.Object value
        end local 1 // java.lang.Object key
        end local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry<TK;TV;>;
            0    4     1    key  TK;
            0    4     2  value  TV;
    Signature: (TK;TV;)V
    MethodParameters:
       Name  Flags
      key    
      value  

  public static <K> org.eclipse.collections.api.block.function.Function<java.util.Map$Entry<K, ?>, K> getKeyFunction();
    descriptor: ()Lorg/eclipse/collections/api/block/function/Function;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 40
            invokestatic org.eclipse.collections.impl.block.factory.Functions.getKeyFunction:()Lorg/eclipse/collections/api/block/function/Function;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <K:Ljava/lang/Object;>()Lorg/eclipse/collections/api/block/function/Function<Ljava/util/Map$Entry<TK;*>;TK;>;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()

  public static <V> org.eclipse.collections.api.block.function.Function<java.util.Map$Entry<?, V>, V> getValueFunction();
    descriptor: ()Lorg/eclipse/collections/api/block/function/Function;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 49
            invokestatic org.eclipse.collections.impl.block.factory.Functions.getValueFunction:()Lorg/eclipse/collections/api/block/function/Function;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <V:Ljava/lang/Object;>()Lorg/eclipse/collections/api/block/function/Function<Ljava/util/Map$Entry<*TV;>;TV;>;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()

  public static <K, V> org.eclipse.collections.api.block.function.Function<java.util.Map$Entry<K, V>, org.eclipse.collections.api.tuple.Pair<K, V>> getPairFunction();
    descriptor: ()Lorg/eclipse/collections/api/block/function/Function;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 54
            getstatic org.eclipse.collections.impl.tuple.AbstractImmutableEntry.TO_PAIR:Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry$PairFunction;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>()Lorg/eclipse/collections/api/block/function/Function<Ljava/util/Map$Entry<TK;TV;>;Lorg/eclipse/collections/api/tuple/Pair<TK;TV;>;>;

  public K getKey();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
         0: .line 60
            aload 0 /* this */
            getfield org.eclipse.collections.impl.tuple.AbstractImmutableEntry.key:Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry<TK;TV;>;
    Signature: ()TK;

  public V getValue();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
         0: .line 66
            aload 0 /* this */
            getfield org.eclipse.collections.impl.tuple.AbstractImmutableEntry.value:Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry<TK;TV;>;
    Signature: ()TV;

  public V setValue();
    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.tuple.AbstractImmutableEntry this
        start local 1 // java.lang.Object value
         0: .line 78
            new java.lang.UnsupportedOperationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Cannot call setValue() 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 value
        end local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry<TK;TV;>;
            0    1     1  value  TV;
    Signature: (TV;)TV;
    MethodParameters:
       Name  Flags
      value  

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
         0: .line 87
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            aload 0 /* this */
            getfield org.eclipse.collections.impl.tuple.AbstractImmutableEntry.key:Ljava/lang/Object;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc "="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.tuple.AbstractImmutableEntry.value:Ljava/lang/Object;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // org.eclipse.collections.impl.tuple.AbstractImmutableEntry this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/tuple/AbstractImmutableEntry<TK;TV;>;
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Map$Entry<TK;TV;>;Ljava/io/Serializable;
SourceFile: "AbstractImmutableEntry.java"
NestMembers:
  org.eclipse.collections.impl.tuple.AbstractImmutableEntry$KeyFunction  org.eclipse.collections.impl.tuple.AbstractImmutableEntry$PairFunction  org.eclipse.collections.impl.tuple.AbstractImmutableEntry$ValueFunction
InnerClasses:
  public abstract Entry = java.util.Map$Entry of java.util.Map
  private KeyFunction = org.eclipse.collections.impl.tuple.AbstractImmutableEntry$KeyFunction of org.eclipse.collections.impl.tuple.AbstractImmutableEntry
  private PairFunction = org.eclipse.collections.impl.tuple.AbstractImmutableEntry$PairFunction of org.eclipse.collections.impl.tuple.AbstractImmutableEntry
  private ValueFunction = org.eclipse.collections.impl.tuple.AbstractImmutableEntry$ValueFunction of org.eclipse.collections.impl.tuple.AbstractImmutableEntry