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.Maps$UnmodifiableEntrySet<K, V> extends com.google.common.collect.Maps$UnmodifiableEntries<K, V> implements java.util.Set<java.util.Map$Entry<K, V>>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.Maps$UnmodifiableEntrySet
  super_class: com.google.common.collect.Maps$UnmodifiableEntries
{
  void <init>(java.util.Set<java.util.Map$Entry<K, V>>);
    descriptor: (Ljava/util/Set;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.Maps$UnmodifiableEntrySet this
        start local 1 // java.util.Set entries
         0: .line 1468
            aload 0 /* this */
            aload 1 /* entries */
            invokespecial com.google.common.collect.Maps$UnmodifiableEntries.<init>:(Ljava/util/Collection;)V
         1: .line 1469
            return
        end local 1 // java.util.Set entries
        end local 0 // com.google.common.collect.Maps$UnmodifiableEntrySet this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lcom/google/common/collect/Maps$UnmodifiableEntrySet<TK;TV;>;
            0    2     1  entries  Ljava/util/Set<Ljava/util/Map$Entry<TK;TV;>;>;
    Signature: (Ljava/util/Set<Ljava/util/Map$Entry<TK;TV;>;>;)V
    MethodParameters:
         Name  Flags
      entries  

  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 // com.google.common.collect.Maps$UnmodifiableEntrySet this
        start local 1 // java.lang.Object object
         0: .line 1475
            aload 0 /* this */
            aload 1 /* object */
            invokestatic com.google.common.collect.Sets.equalsImpl:(Ljava/util/Set;Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object object
        end local 0 // com.google.common.collect.Maps$UnmodifiableEntrySet this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/google/common/collect/Maps$UnmodifiableEntrySet<TK;TV;>;
            0    1     1  object  Ljava/lang/Object;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
        Name  Flags
      object  

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.Maps$UnmodifiableEntrySet this
         0: .line 1480
            aload 0 /* this */
            invokestatic com.google.common.collect.Sets.hashCodeImpl:(Ljava/util/Set;)I
            ireturn
        end local 0 // com.google.common.collect.Maps$UnmodifiableEntrySet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/Maps$UnmodifiableEntrySet<TK;TV;>;
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>Lcom/google/common/collect/Maps$UnmodifiableEntries<TK;TV;>;Ljava/util/Set<Ljava/util/Map$Entry<TK;TV;>;>;
SourceFile: "Maps.java"
NestHost: com.google.common.collect.Maps
InnerClasses:
  UnmodifiableEntries = com.google.common.collect.Maps$UnmodifiableEntries of com.google.common.collect.Maps
  UnmodifiableEntrySet = com.google.common.collect.Maps$UnmodifiableEntrySet of com.google.common.collect.Maps
  public abstract Entry = java.util.Map$Entry of java.util.Map