gistfile1.java

cat Hello.java 
class Hello {
	public static void main(String ... args) {
		Hello hello = new Hello();
		hello.test();
	}
	public void test() {
		runIt(() -> this.something());
	}
	public void runIt(Runnable r) {
		r.run();
	}
	public void something() {
  		System.out.println("Hello world");
	}
}
		
$javap -c Hello 
Compiled from "Hello.java"
class Hello {
  Hello();
    Code:
       0: aload_0       
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return        

  public static void main(java.lang.String...);
    Code:
       0: new           #2                  // class Hello
       3: dup           
       4: invokespecial #3                  // Method "<init>":()V
       7: astore_1      
       8: aload_1       
       9: invokevirtual #4                  // Method test:()V
      12: return        

  public void test();
    Code:
       0: aload_0       
       1: aload_0       
       2: invokedynamic #5,  0              // InvokeDynamic #0:run:(LHello;)Ljava/lang/Runnable;
       7: invokevirtual #6                  // Method runIt:(Ljava/lang/Runnable;)V
      10: return        

  public void runIt(java.lang.Runnable);
    Code:
       0: aload_1       
       1: invokeinterface #7,  1            // InterfaceMethod java/lang/Runnable.run:()V
       6: return        

  public void something();
    Code:
       0: getstatic     #8                  // Field java/lang/System.out:Ljava/io/PrintStream;
       3: ldc           #9                  // String Hello world
       5: invokevirtual #10                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
       8: return        
}