java - Point2D ArrayList打印Cocoles前面的方法

Question

我正在尝试制作一个 Point2D 坐标数组列表，然后向用户打印出位于 y=x 线上方、y=x 线下方和 y=x 线上的坐标。我想我有它，但由于某种原因，每当我打印出我的 Point2D 数组列表时，它都会打印如下:

[Point2D.Float[1.0, 2.0], Point2D.Float[3.0, 4.0]]

如何删除 Point2D.Float？

这是我的代码:

Main.java:

package com.lucas.q1;

import java.util.Scanner;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ArrayList<Coordinate> coords = new ArrayList<Coordinate>();
        ArrayList<Float> xvals = new ArrayList<Float>();
        ArrayList<Float> yvals = new ArrayList<Float>();
        ArrayList<Point2D> coordTest = new ArrayList<Point2D>();

        //ArrayList<Float> sortedList = new ArrayList<Float>();
        Scanner in = new Scanner(System.in);
        float xinput;
        float yinput;
        Coordinate x;
        Coordinate y;
        boolean tst = true;
        while (tst)
        {
            System.out.println("Enter X: ");
            xinput = in.nextFloat();
            if (xinput == 000)
            {
                break;
            }

            System.out.println("Enter Y: ");
            yinput = in.nextFloat();
            if (yinput == 000)
            {
                break;
            }
            Point2D p = new Point2D.Float(xinput, yinput);
            coordTest.add(p);           
        }

        CompareCoords c = new CompareCoords(coordTest);
        System.out.println(c.printAboveLine()); 
    }
}

CompareCoords.java:

package com.lucas.q1;

import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class CompareCoords {

    ArrayList<Point2D> onLine = new ArrayList<Point2D>();
    ArrayList<Point2D> belowLine = new ArrayList<Point2D>();
    ArrayList<Point2D> aboveLine = new ArrayList<Point2D>();

    public CompareCoords(List<Point2D> coordTest)
    {
        for (int i = 0; i < coordTest.size(); i++)
        {
            if (coordTest.get(i).getX() == coordTest.get(i).getY())
            {
                onLine.add(coordTest.get(i));
            }

            if (coordTest.get(i).getX() < coordTest.get(i).getY())
            {
                aboveLine.add(coordTest.get(i));
            }

            if (coordTest.get(i).getX() > coordTest.get(i).getY())
            {
                belowLine.add(coordTest.get(i));
            }
        }
        System.out.println(aboveLine.get(0));
    }


    public ArrayList<Point2D> printAboveLine()
    {
        return aboveLine;

    }
}

Answer 1

作为一种可能的解决方案，您可以实现方法 void printPoints(List<Point2D> points)将 Point2D 对象列表打印到控制台。它可能看起来像这样

void printPoints(List<Point2D> points) {
   for(Point2D p:points) {
      System.out.println("[" + p.getX() + ", " + p.getY() + "]");
   }
}