Question

急！！！简单JAVA编程代码

定义一个类MyRectangle代表矩形，为矩形定义getwidth方法（获得矩形的宽度）。getLength方法（获得矩形的长度）SetWidth(设置宽度）getArea方法（求矩形面积）和toString方法（显示矩形格式）。为矩形派生出一个子类，MySquare代表正方形，并对getArea和toString进行重写。并编写程序进行测试！！！谢谢！！

Answer 1

public class Test {
public static void main(String[] args) {

MyRectangle rec = new MyRectangle(3, 5);

MyRectangle square = new MySquare(4);

System.out.println(rec.toString());
System.out.println(square.toString());
}

}

class MyRectangle{
protected double width;
protected double length;

public MyRectangle(double length, double width){
this.width = width;
this.length = length;
}

public double getLength() {
return length;
}

public double getWidth() {
return width;
}

public void setWidth(double width) {
this.width = width;
}

public double getArea(){
return this.width * this.length;
}

public String toString(){
return "长方形的长为：" + length + ", 宽: " + width + ", 面积为:" + getArea();
}
}

class MySquare extends MyRectangle{
public MySquare(double length){
super(length, length);
}

public double getArea(){
return Math.pow(super.width, 2);
}
public String toString(){
return "正方形边长为: " + super.length + ", 面积为: " + getArea();
}
}

----------测试
长方形的长为：3.0, 宽: 5.0, 面积为:15.0
正方形边长为: 4.0, 面积为: 16.0