java 使用抽象类解决长方形与圆求周长与面积的实现

人狠话不多，直接上代码

abstract class solver{//模糊类
    public abstract void getArea(); // 获取面积

    public abstract void getPan(); // 获取周长
}
class rectangle extends solver{//长方形
    private double a;
    private double b;
    public void  getPan() {
        double c=a+b+b+a;
        System.out.println("周长为"+c);
    }
    public void getArea(){
        System.out.println("面积为"+a*b);
    }
    public rectangle(double a,double b){
        this.a=a;
        this.b=b;
    }
    public static void main(String[] args) {
        rectangle a1= new rectangle(1,2);
        a1.getArea();
        a1.getPan();
    }
}
class circle extends solver{//圆

    private double r;
    double a=Math.PI;
    public void  getPan() {
        System.out.println("周长为"+a*r*2);
    }
    public void getArea(){
        System.out.println("面积为"+a*r*r);
    }
    public circle(double r){
        this.r=r;

    }
    public static void main(String[] args) {
        circle a1= new circle(1);
        a1.getArea();
        a1.getPan();
    }}