Sum.java

class Scratch {

    public static void main(String[] args) {

        SumOOP sumOOP = new SumOOP(2, 3);
        System.out.println("sumOOP = " + sumOOP.compute());

        SumNoOOP sumNoOOP = new SumNoOOP(2, 3);
        int sumNoOOp = sumNoOOP.getA() + sumNoOOP.getB();
        System.out.println("sumNoOOP = " + sumNoOOP);
    }

    static class SumOOP {
        int a;
        int b;

        public SumOOP(int a, int b) {
            this.a = a;
            this.b = b;
        }

        int compute() { return a + b; }
    }

    static class SumNoOOP {
        int a;
        int b;

        public SumNoOOP(int a, int b) {
            this.a = a;
            this.b = b;
        }

        public int getA() {
            return a;
        }

        public void setA(int a) {
            this.a = a;
        }

        public int getB() {
            return b;
        }

        public void setB(int b) {
            this.b = b;
        }
    }
}