java - 如何移动一个点并打印新位置？

Question

我是 Java 的新手，我收到了一项任务，要求我编写一个名为 PointerTester 的类，该类具有两个 Points 作为实例变量。我需要在坐标 (0.0,0.0) 处初始化其中一个，在 (10.0,12.0) 处初始化其中一个。然后我需要将每个点在 x 方向移动 +2.0，在 Y 方向移动 -3.0，查询这些点的坐标，并打印出值。

到目前为止我有这个:

public class PointerTester{
/*instance variables*/
    private double pointOneX;
    private double pointOneY;
    private double pointTwoX;
    private double pointTwoY;
    private double deltaX;
    private double deltaY;

    /*constructor to initialize*/
    public PointerTester (){
        pointOneX = 0.0;
        pointOneY = 0.0;
        pointTwoX = 10.0;
        pointTwoY = 12.0;
        deltaX = 2.0;
        deltaY = -3.0;
    }

    /*constructor to initialize to specific value*/
    PointerTester(double pointOneX, double pointOneY, double pointTwoX, double pointTwoY){
        this.pointOneX = pointOneX;
        this.pointOneY = pointOneY;
        this.pointTwoX = pointTwoX;
        this.pointTwoY = pointTwoY;
    }

    /*command to change value*/
    public void moveBy(double deltaX, double deltaY){
        this.pointOneX = this.pointOneX + deltaX;
        this.pointOneY = this.pointOneY + deltaY;
        this.pointTwoX = this.pointTwoX + deltaX;
        this.pointTwoY = this.pointTwoY + deltaY;
    }

    /*Queries*/
    public double getOneX(){
        return pointOneX;
    }
    public double getOneY(){
        return pointOneY;
    }
    public double getTwoX(){
        return pointTwoX;
    }
    public double getTwoY(){
        return pointTwoY;
    }
    /*print values*/
    public static void main(String[] args){
        PointerTester pointOne = new PointerTester();
        PointerTester pointTwo = new PointerTester();
        System.out.println("Point One after move (" + pointOne + ")");
        System.out.println("Point Two after move (" + pointTwo + ")");
    }
}

我不知道如何正确输出值，或者我在处理这个问题时是否完全错误。

编辑 看来我需要使用我最初认为应该分开的这段代码

public class Point{
    public double x;
    public double y;


    public Point(double x, double y){
        this.x = x;
        this.y = y;
    }
    public void setX(double x){
        this.x = x;
    }
    public void setY(double y){
        this.y = y;
    }
    public double getX(){
        return x;
    }
    public double getY(){
        return y;
    }
}

如何将其合并到我的代码中？

Answer 1

我认为开始之前，您应该有一个名为“Point”的单独类，它封装了 X 和 Y 值，并包含一个“moveBy”方法。它还可以实现“toString()”，这样“System.out.println”会为它打印一些不错的东西。 [编辑:或者只使用 java.awt.Point。]

除此之外，我会把它留给你做功课。