Firstly, int type of method always return value, but you didn't return anything. Secondly, you cannot define a method inside another method. Anyways, we have modified your code.

Here it is:

class Example2{
    void g() {
      System.out.println("Inside method g");
    }
    void h() { 
      System.out.println("Inside method h");
    }
  public static void main(String[]args){
      Example2 ex=new Example2();
      ex.g();
      ex.h();
    }
}