package bean;
public abstract class Shape {
public abstract double getPeremeter();
public abstract double getArea();
}
package bean;
public class Square extends Shape{
private double length;
private double width;
private double pemimter;
private double area;
@Override
public double getPeremeter() {
// TODO Auto-generated method stub
return (this.length+this.width)*2;
}
@Override
public double getArea() {
// TODO Auto-generated method stub
return this.width*this.length;
}
}
package bean;
public class Circle extends Shape{
public double radius;
@Override
public double getPeremeter() {
// TODO Auto-generated method stub
return this.radius*2*Math.PI;
}
@Override
public double getArea() {
// TODO Auto-generated method stub
return this.radius*this.radius*Math.PI;
}
}
package test;
import bean.Circle;
import bean.Square;
public class ShapeTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Square h=new Square(8,8);
System.out.println("长方形的面积："+h.getArea());
System.out.println("长方形的周长："+h.getPeremeter());
Circle i=new Circle(8);
System.out.println("圆的面积："+i.getArea());
System.out.println("圆的周长："+i.getPeremeter());
}
}
这2条语句错误，因为2个类里面没有对应的构造函数
Square h=new Square(8,8);
Circle i=new Circle(8);
修改代码如下(测试类不用改):
package bean;
public abstract class Shape {
public abstract double getPeremeter();
public abstract double getArea();
}
package bean;
public class Square extends Shape{
private double length;
private double width;
private double pemimter;
private double area;
//添加构造函数
public Square(double length,double width){
this.length = length;
this.width = width;
}
@Override
public double getPeremeter() {
// TODO Auto-generated method stub
return (this.length+this.width)*2;
}
@Override
public double getArea() {
// TODO Auto-generated method stub
return this.width*this.length;
}
}
package bean;
public class Circle extends Shape{
public double radius;
//添加构造函数
public Circle(double radius){
this.radius = radius;
}
@Override
public double getPeremeter() {
// TODO Auto-generated method stub
return this.radius*2*Math.PI;
}
@Override
public double getArea() {
// TODO Auto-generated method stub
return this.radius*this.radius*Math.PI;
}
}
请采纳，谢谢！
Square和Circle没有写构造函数
Square中加入构造函数
public Square(int a, int b) {
super();
}
Circle中加入构造函数
public Circle(int i) {
}
构造函数里面的内容你自己根据需要补充
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