编写一个 java 程序 用于计算矩形的周长和面积—键盘录入

public class M {
    int chang;
    int kuan;
    public int getChang() {
        return chang;
    }
    public void setChang(int chang) {
        this.chang = chang;
    }
    public int getKuan() {
        return kuan;
    }
    public void setKuan(int kuan) {
        this.kuan = kuan;
    }
}

public class Test {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        M haha = new M();
        System.out.print("输入长：");
        haha.setChang(in.nextInt());
        System.out.print("输入宽：");
        haha.setKuan(in.nextInt());
        System.out.println("输出面积：" + haha.getChang()*haha.getKuan());
        System.out.print("输入周长：" + (haha.getKuan()+haha.getChang())*2);
    }

}