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. 
public interface com.google.common.collect.Maps$EntryTransformer<K, V1, V2>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.common.collect.Maps$EntryTransformer
  super_class: java.lang.Object
{
  public abstract V2 transformEntry(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TK;TV1;)TV2;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
       Name  Flags
      key    
      value  
}
Signature: <K:Ljava/lang/Object;V1:Ljava/lang/Object;V2:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "Maps.java"
NestHost: com.google.common.collect.Maps
InnerClasses:
  public abstract EntryTransformer = com.google.common.collect.Maps$EntryTransformer of com.google.common.collect.Maps
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()