Why does Java code with an inner class generates a third SomeClass$1.class file?

Question

If I have an inner class, like this:

public class Test
{
    public class Inner
    {
        // code ...
    }

    public static void main(String[] args)
          


        

Answer 1

to build up on hhafez : SomeClass$1.class represents anonymous inner classes. An example of such a class would be

public class Foo{
  public void printMe(){
    System.out.println("redefine me!");
  }
}


public class Bar {
    public void printMe() {
    Foo f = new Foo() {
        public void printMe() {
        System.out.println("defined");
        }
    };
    f.printMe();
    }
}

From a normal Main, if you called new Bar().printMe it would print "defined" and in the compilation directory you will find Bar1.class

this section in the above code :

    Foo f = new Foo() {
        public void printMe() {
        System.out.println("defined");
        }
    };

is called an anonymous inner class.