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编写一个矩形类Rectangle，编写一个测试类test。其中矩形类中包括double型长宽属性，double型返回值类型的求周长方法和求面积方法。利用测试类求出长为4，宽为3的矩形的周长和面积。
参考答案和解析
public class Rectangle { 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; } public Rectangle(double x, double y) { super(); this.x = x; this.y = y; } public Rectangle() { } public double getArea(){ return x*y; } public static void main(String[] args) { Rectangle rec1=new Rectangle(5,4); Rectangle rec2=new Rectangle(8,5); System.out.println(rec1.getArea()); System.out.println(rec2.getArea()); }}
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