point.java

来自「我在学习JAVA的讲义」· Java 代码 · 共 39 行

public class Point
{   //平面上点的类
    private double x,y;

    public Point(double a,double b)
    {   x=a;
        y=b;
    }

    public double x( )
    {   return x;
    }

    public double y( )
    {   return y;
    }

    public boolean equals(Point p)
    {   return (x==p.x && y==p.y);
    }

    public String toString( )
    {   return new String("("+x+","+y+")");
    }

    public static void main(String args[ ])
    {   Point p=new Point(2,3);
        System.out.println("p.x( )="+p.x( )+",p.y( )="+p.y( ));
        System.out.println("p="+p);
        Point q=new Point(7,4);
        System.out.println("q="+q);
        if(q.equals(p)) System.out.print("q equals p");
        else System.out.println("q does not equal p");
        q=new Point(2,3);
        System.out.println("q="+q);
        if (q.equals(p)) System.out.println("q equals p");
        else System.out.println("q does not equal p");
    }
}