用面向对象实现简易计算器

目录

 1.面向对象的计算器

 2.面向对象的交换两数值

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 1.面向对象的计算器

//计算器的类
class Calculator {
    private int num1;
    private int num2;

    public int getNum1() {
        return num1;
    }

    public void setNum1(int num1) {
        this.num1 = num1;
    }

    public int getNum2() {
        return num2;
    }

    public void setNum2(int num2) {
        this.num2 = num2;
    }
    //加法
    public int add() {
        return num1 + num2;
    }
    //减法
    public int sub() {
        return num1 - num2;
    }
    //乘法
    public int mul() {
        return num1 * num2;
    }
    //除法
    public double dev() {
        return num1*1.0/num2;
    }

}

public class TestDemo {
    public static void main(String[] args) {
        //类实现面向对象
        Calculator calculator = new Calculator();
        //给num1 和 num2 赋值
        calculator.setNum1(2);
        calculator.setNum2(4);

        System.out.println("和："+calculator.add());
        System.out.println("减："+calculator.sub());
        System.out.println("乘："+calculator.mul());
        System.out.println("除："+calculator.dev());


    }
}

 2.面向对象的交换两数值

//交换数值
class MyValue {
    public int val;
}

public class TestDemo {

    public static void swap(MyValue myV1,MyValue myV2) {
        int tmp = myV1.val;
        myV1.val = myV2.val;
        myV2.val = tmp;

    }

    public static void main(String[] args) {
        MyValue myValue1 = new MyValue();
        myValue1.val = 10;

        MyValue myValue2 = new MyValue();
        myValue2.val = 20;
        System.out.println("交换前："+myValue1.val+ " "+myValue2.val);
        swap(myValue1,myValue2);
        System.out.println("交换后："+myValue1.val+ " "+myValue2.val);
    }
}