继承方法表现不同几何图形面积

来源：互联网发布：编程sum函数的使用方法编辑：程序博客网时间：2024/05/16 16:06

package mianji;/** * 总父类 * @author Administrator * */public class Shape {        public double zhouchang(){            return 0.0;        }        public double mianji(){            return 0.0;        }}

package mianji;//矩形public class Rect extends Shape {    public double weight;    public double height;    public double zhouchang() {        return (weight+height)*2;    }    public double mianji() {        return weight*height;    }    }

package mianji;public class Sqare extends Rect {    public double bian;    @Override    public double zhouchang() {        return bian*4;    }    @Override    public double mianji() {        return bian*bian;    }}

package mianji;public class Circle extends Shape {    public double r;    public final double PI=3.14;    @Override    public double zhouchang() {        return 2*PI*r;    }    @Override    public double mianji() {        return PI*r*r;    }}

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