java对矩形类中buildRect方法通过参数的不同进行重载

import java.awt.Point;
public class MyRect//定义矩形类
{
	int x1=0;//左上角坐标初始化
	int y1=0;
	int x2=0;//右下角坐标初始化
	int y2=0;
	MyRect buildRect(int x1,int y1,int x2,int y2)//方法1，左上角和右下角
	{
		this.x1=x1;
		this.y1=y1;
		this.x2=x2;
		this.y2=y2;
		return this; //返回这个类对象
	}
	MyRect buildRect(Point topLeft,Point bottomRight)//方法2，两个Point对象，指定左上角和右下角坐标
	{
		x1=topLeft.x;
		y1=topLeft.y;
		x2=bottomRight.x;
		y2=bottomRight.y;
		return this;
	}
	MyRect buildRect(Point topLeft,int w,int h)//方法3，左上角和宽度与高度
	{
		x1=topLeft.x;
		y1=topLeft.y;
		x2=(x1+w);
		y2=(y1+h);
		return this;
	}
	void printRect()//打印输出坐标
	{
		System.out.print("MyRect:<"+x1+","+y1);//打印后不换行 System.out.println(","+x2+","+y2+">");//继续上行打印
	}
	public static void main(String[] arguments)//main()方法
	{
		MyRect rect=new MyRect();//创建对象
		System.out.println("Calling buildRect with coordinates 25,25,50,50: ");
		rect.buildRect(25,25,50,50);//创建矩形1，调用方法1
		rect.printRect();//打印出作标
		System.out.println("***");
		System.out.println("Calling buildRect with points (10,10),(20,20): ");
		rect.buildRect(new Point(10,10),new Point(20,20));//矩形2，调用方法2
		rect.printRect();//打印出作标
		System.out.println("***");
		System.out.print("Calling buildRect with 1 point(10,10),");
		System.out.println("width(50) and height(50):");//继续上上打印
		rect.buildRect(new Point(10,10),50,50);//矩形3，调用方法3
		rect.printRect();//打印出作标
		System.out.println("***");
	}
}