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$10 implements com.google.common.base.Function<V1, V2>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.Maps$10
  super_class: java.lang.Object
{
  private final com.google.common.collect.Maps$EntryTransformer val$transformer;
    descriptor: Lcom/google/common/collect/Maps$EntryTransformer;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final java.lang.Object val$key;
    descriptor: Ljava/lang/Object;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.google.common.collect.Maps$EntryTransformer, java.lang.Object);
    descriptor: (Lcom/google/common/collect/Maps$EntryTransformer;Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.common.collect.Maps$10 this
         0: .line 1956
            aload 0 /* this */
            aload 1
            putfield com.google.common.collect.Maps$10.val$transformer:Lcom/google/common/collect/Maps$EntryTransformer;
            aload 0 /* this */
            aload 2
            putfield com.google.common.collect.Maps$10.val$key:Ljava/lang/Object;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.collect.Maps$10 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/Maps$10;
    MethodParameters:
                 Name  Flags
      val$transformer  final
      val$key          final

  public V2 apply();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.google.common.collect.Maps$10 this
        start local 1 // java.lang.Object v1
         0: .line 1959
            aload 0 /* this */
            getfield com.google.common.collect.Maps$10.val$transformer:Lcom/google/common/collect/Maps$EntryTransformer;
            aload 0 /* this */
            getfield com.google.common.collect.Maps$10.val$key:Ljava/lang/Object;
            aload 1 /* v1 */
            invokeinterface com.google.common.collect.Maps$EntryTransformer.transformEntry:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.Object v1
        end local 0 // com.google.common.collect.Maps$10 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/Maps$10;
            0    1     1    v1  TV1;
    Signature: (TV1;)TV2;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
      Name  Flags
      v1    
}
Signature: Ljava/lang/Object;Lcom/google/common/base/Function<TV1;TV2;>;
SourceFile: "Maps.java"
EnclosingMethod: com.google.common.collect.Maps.asValueToValueFunction:(Lcom/google/common/collect/Maps$EntryTransformer;Ljava/lang/Object;)Lcom/google/common/base/Function;
NestHost: com.google.common.collect.Maps
InnerClasses:
  com.google.common.collect.Maps$10
  public abstract EntryTransformer = com.google.common.collect.Maps$EntryTransformer of com.google.common.collect.Maps