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. 
class com.google.common.collect.ImmutableEntry<K, V> extends com.google.common.collect.AbstractMapEntry<K, V> implements java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.ImmutableEntry
  super_class: com.google.common.collect.AbstractMapEntry
{
  final K key;
    descriptor: Ljava/lang/Object;
    flags: (0x0010) ACC_FINAL
    Signature: TK;
    RuntimeVisibleTypeAnnotations: 
      FIELD
        org.checkerframework.checker.nullness.qual.Nullable()

  final V value;
    descriptor: Ljava/lang/Object;
    flags: (0x0010) ACC_FINAL
    Signature: TV;
    RuntimeVisibleTypeAnnotations: 
      FIELD
        org.checkerframework.checker.nullness.qual.Nullable()

  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 0

  void <init>(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.common.collect.ImmutableEntry this
        start local 1 // java.lang.Object key
        start local 2 // java.lang.Object value
         0: .line 29
            aload 0 /* this */
            invokespecial com.google.common.collect.AbstractMapEntry.<init>:()V
         1: .line 30
            aload 0 /* this */
            aload 1 /* key */
            putfield com.google.common.collect.ImmutableEntry.key:Ljava/lang/Object;
         2: .line 31
            aload 0 /* this */
            aload 2 /* value */
            putfield com.google.common.collect.ImmutableEntry.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 // com.google.common.collect.ImmutableEntry this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lcom/google/common/collect/ImmutableEntry<TK;TV;>;
            0    4     1    key  TK;
            0    4     2  value  TV;
    Signature: (TK;TV;)V
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
       Name  Flags
      key    
      value  

  public final K getKey();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.ImmutableEntry this
         0: .line 36
            aload 0 /* this */
            getfield com.google.common.collect.ImmutableEntry.key:Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.collect.ImmutableEntry this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/ImmutableEntry<TK;TV;>;
    Signature: ()TK;
    RuntimeVisibleTypeAnnotations: 
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()

  public final V getValue();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.ImmutableEntry this
         0: .line 41
            aload 0 /* this */
            getfield com.google.common.collect.ImmutableEntry.value:Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.collect.ImmutableEntry this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/ImmutableEntry<TK;TV;>;
    Signature: ()TV;
    RuntimeVisibleTypeAnnotations: 
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()

  public final V setValue();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.ImmutableEntry this
        start local 1 // java.lang.Object value
         0: .line 46
            new java.lang.UnsupportedOperationException
            dup
            invokespecial java.lang.UnsupportedOperationException.<init>:()V
            athrow
        end local 1 // java.lang.Object value
        end local 0 // com.google.common.collect.ImmutableEntry this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/google/common/collect/ImmutableEntry<TK;TV;>;
            0    1     1  value  TV;
    Signature: (TV;)TV;
    MethodParameters:
       Name  Flags
      value  
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>Lcom/google/common/collect/AbstractMapEntry<TK;TV;>;Ljava/io/Serializable;
SourceFile: "ImmutableEntry.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible(serializable = true)