class point
{
    int x,y;
    void setXY(int m,int n)
    {
        x=m;
        y=n;
    }
}
public class application4_8
{
    public static void main(String args[])
    {
                 point  p1,p2,p3;
                p1=new point();
        p2=new point();
        System.out.println("p1的引用:"+p1);
        System.out.println("p2的引用:"+p2);
        p1.setXY(1111,2222);
        p2.setXY(-100,-200);
        System.out.println("p1的x,y坐标:"+p1.x+"."+p1.y);
        System.out.println("p2的x,y坐标:"+p2.x+"."+p2.y);
        p2=p1;
        System.out.println("p1的x,y坐标:"+p1.x+"."+p1.y);
        System.out.println("p2的x,y坐标:"+p2.x+"."+p2.y);
        p3=p2;
        p3.x=10;
        p3.y=60;
        System.out.println("p1的x,y坐标:"+p1.x+"."+p1.y);
    }
}

为什么最后p1的坐标是10，60，按道理说p2赋值给p3，应该用p2的值代替P3，则p1的坐标应该不变啊，怎么会变成10，60，不懂，请大神指教！！

我可能弄反了，