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.myInnerMethod());

  }

}

​

class OuterClass {

  int x = 10; 

​

  class InnerClass {

    public int myInnerMethod() {

      return x;

    }

  }

}

​