Kalkulator

a. Class Kalkulator
class kalkulator
            {
            int operand1;
            int operand2;
            int pertambahan()
            {
                        return operand1+operand2;
            }
            void setPertambahan (int operand1, int operand2)
            {
            operand1 = operand1;
            operand2 = operand2;
            }
            int pengurangan()
            {
                        return operand1-operand2;
            }
            void setPengurangan (int operand1, int operand2)   
            {
            operand1 = operand1;
            operand2 = operand2;
            }
}



b. Class Kalkulator Beraksi

public class kalkulatorberaksi
            {
            public static void main (String[] args)
                        {
                        kalkulator kalkulatorsaya = new kalkulator();
                        int pertambahan;
                        kalkulatorsaya.operand1 = 30;
                        kalkulatorsaya.operand2 = 30;
                        pertambahan=kalkulatorsaya.operand1+kalkulatorsaya.operand2;
                        System.out.println("Pertambahan : 30+30 ="+ pertambahan);
                        kalkulatorsaya.setPertambahan(30,30);
                        pertambahan = kalkulatorsaya.pertambahan();
                        System.out.println("Pertambahan = " + pertambahan);
                                    System.out.println("\n");
                        int pengurangan;
                        kalkulatorsaya.operand1 = 20;
                        kalkulatorsaya.operand2 = 10;          
                        pengurangan=kalkulatorsaya.operand1-kalkulatorsaya.operand2;
                        System.out.println("Pengurangan : 20+10 ="+ pengurangan);
                        kalkulatorsaya.setPengurangan(20,10);
                        pengurangan = kalkulatorsaya.pengurangan();
                        System.out.println("Pengurangan = " + pengurangan);
                        }
}