编写一个Shape类,具有属性:周长和面积;
定义其子类三角形和矩形,分别具有求周长的方法。
定义主类E,在其main方法中创建三角形和矩形类的对象,
并赋给Shape类的对象a、b,使用对象a、b来测试其特性。
父类:
package com.lianxi5; //抽象类 public abstract class Shape { private double mianJi; private double zhouchang; public double getMianJi() { return mianJi; } public void setMianJi(double mianJi) { this.mianJi = mianJi; } public double getZhouchang() { return zhouchang; } public void setZhouchang(double zhouchang) { this.zhouchang = zhouchang; } public abstract double zhouchang(); }
子类;
package com.lianxi5; public class Zc extends Shape { private double x; private double y; private double z; public double getX() { return x; } public void setX(double x) { this.x = x; } public double getY() { return y; } public void setY(double y) { this.y = y; } public double getZ() { return z; } public void setZ(double z) { this.z = z; } @Override public double zhouchang() { if((x+y)>z&&(x+z)>y&&(y+z)>x) { return x+y+z; } else { return 0; } } }
package com.lianxi5; public class Jxzc extends Shape { private double x; private double y; public double getX() { return x; } public void setX(double x) { this.x = x; } public double getY() { return y; } public void setY(double y) { this.y = y; } @Override public double zhouchang() { return (x+y)*2; } }
测试;
package com.lianxi5; public class Test { public static void main(String[] args) { Zc z=new Zc(); Jxzc j=new Jxzc(); z.setX(7); z.setY(8); z.setZ(9); System.out.println(z.zhouchang()); } }
结果: