继承

最新推荐文章于 2025-07-02 10:54:09 发布

原创最新推荐文章于 2025-07-02 10:54:09 发布 · 145 阅读

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本文探讨了在Java中如何使用抽象类Myshape来定义形状的周长和面积计算，并通过Yuan（圆）和Juxing（矩形）两个子类的具体实现，展示了多态性和继承的概念。

package com.imooc;

public class Test {

public static void main(String[] args) {
	// TODO Auto-generated method stub
	
	//Juxing shape1=new Juxing(3,5);
	//Yuan shape2=new Yuan(4);
	print(new Yuan(7));
	print(new Juxing(3,5));
	
	//System.out.println(shape1.zhouchang());
	
	//System.out.println(shape1.mianji());
	
	//System.out.println(shape2.zhouchang());
	
	//System.out.println(shape2.mianji());

}

public static void print(Myshape m) {
	System.out.println(m.zhouchang());
	System.out.println(m.mianji());

}

}
public abstract class Myshape {

abstract double zhouchang();

abstract double mianji();

}
public class Juxing extends Myshape {

double weight;
double height;
//数据接收
Juxing(double a,double b){
	
	this.weight=a;
	this.height=b;
}
//重写父内方法
double zhouchang() {
	return 2*(weight+height);
	
}

double mianji() {
	return weight*height;
	
}

}
public class Yuan extends Myshape{

double r;

public static  double PI=3.14;

Yuan(double a){
	
	this.r=a;
	
}

double zhouchang() {
	
	return 2*PI*r;
	
}

double mianji() {
	
	return r*PI*r;
	
}

}