Java定义一个Point（点）类

public class Point { public static void main(String[] args) { Point p1=new Point(); Point p2=new Point(1,2); p1.show(); p1.move(3,4); p1.show(); p2.show(); p2.move(5,6); p2.show(); } Point() { this(0,0); } Point(float x,float y