W3School TIY Editor

public class Main {

  public static void main(String[] args) {

    OuterClass myOuter = new OuterClass();

    OuterClass.InnerClass myInner = myOuter.new InnerClass();

    System.out.println(myInner.y + myOuter.x);

  }

}

​

class OuterClass {

  int x = 10;

​

  class InnerClass {

    int y = 5;

  }

}

​