一个Point(点)类，该类具有x,y(表示点的横、纵坐标)两个属性，并定义两个构造方法，一个无参数，将x,y均设

public class Point { private double x; private double y; public Point(){ x=0; y=0; } public Point(double x,double y){ this.x=x; this.y=y; } public void show(){ System.out.println("("+x+","+y+")");