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.util.concurrent.Callables$1 implements java.util.concurrent.Callable<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.util.concurrent.Callables$1
  super_class: java.lang.Object
{
  private final java.lang.Object val$value;
    descriptor: Ljava/lang/Object;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(java.lang.Object);
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.util.concurrent.Callables$1 this
         0: .line 38
            aload 0 /* this */
            aload 1
            putfield com.google.common.util.concurrent.Callables$1.val$value:Ljava/lang/Object;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.util.concurrent.Callables$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/util/concurrent/Callables$1;
    MethodParameters:
           Name  Flags
      val$value  final

  public T call();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.util.concurrent.Callables$1 this
         0: .line 41
            aload 0 /* this */
            getfield com.google.common.util.concurrent.Callables$1.val$value:Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.util.concurrent.Callables$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/util/concurrent/Callables$1;
    Signature: ()TT;
}
Signature: Ljava/lang/Object;Ljava/util/concurrent/Callable<TT;>;
SourceFile: "Callables.java"
EnclosingMethod: com.google.common.util.concurrent.Callables.returning:(Ljava/lang/Object;)Ljava/util/concurrent/Callable;
NestHost: com.google.common.util.concurrent.Callables
InnerClasses:
  com.google.common.util.concurrent.Callables$1