publicclass HelloWorld{

    publicint add(int a,int b){

        return a + b;

    }

    publicdouble add(double a,int b){

        return a + b;

    }

    publicdouble add(int a,double b){

        return a + b;

    }

    publicdouble add(double a,double b){

        return a + b;

    }

     publicstaticvoid main(String[]args){

        System.out.println("Hello World");

        HelloWorld demo =new HelloWorld();

        int n1 =2;

        int n2 =4;

        double n3 =2.5;

        double n4 =3.8;

        System.out.println(n1 +"+"+ n2 +"="+ demo.add(n1, n2));

        System.out.println(n1 +"+"+ n3 +"="+ demo.add(n1, n3));

        System.out.println(n4 +"+"+ n2 +"="+ demo.add(n4, n2));

        System.out.println(n3 +"+"+ n4 +"="+ demo.add(n3, n4));        

     }

}