java存储X和Y坐标

Question

嗨，我是新来这个网站的，我需要一个项目的帮助。我的问题是，我似乎无法存储字符串和两个整数（作为坐标）。我看过其他代码，但没有看到值是如何存储的。下面是我一直在使用的代码。代码似乎很好，但在尝试存储值时，我不能将乘法整数。谢谢你抽出时间

import java.util.HashMap;
public class map {

    class Coords {
        int x;
        int y;

        public boolean equals(Object o) {
            Coords c = (Coords) o;
            return c.x == x && c.y == y;
        }

        public Coords(int x, int y) {
            super();
            this.x = x;
            this.y = y;
        }

        public int hashCode() {
            return new Integer(x + "0" + y);
        }
    }

    public static void main(String args[]) {

        HashMap<Coords, Character> map = new HashMap<Coords, Character>();
        map.put(new coords(65, 72), "Dan");
    }

}

Answer 1

java中有一个名为class Point的类

http://docs.oracle.com/javase/7/docs/api/java/awt/Point.html

这与Java docs API 10中提供的信息相同：

https://docs.oracle.com/javase/10/docs/api/java/awt/Point.html

在（x，y）坐标空间中表示位置的点，以整数精度指定

你可以在这个链接中看到一个例子，以及其他相关的重要主题：http://www.java2s.com/Tutorial/Java/0261__2D-Graphics/Pointclass.htm

import java.awt.Point;

class PointSetter {

  public static void main(String[] arguments) {
    Point location = new Point(4, 13);

    System.out.println("Starting location:");
    System.out.println("X equals " + location.x);
    System.out.println("Y equals " + location.y);

    System.out.println("\nMoving to (7, 6)");
    location.x = 7;
    location.y = 6;

    System.out.println("\nEnding location:");
    System.out.println("X equals " + location.x);
    System.out.println("Y equals " + location.y);
  }
}

我希望这能帮助你

Answer 2

添加到@assylias

1. 使您inner classstatic以插入新对象，就像您所拥有的或new Outer().new Inner()
2. 照顾Java Naming Convention

代码如下：

public class XYTest {
    static class Coords {
        int x;
        int y;

        public boolean equals(Object o) {
            Coords c = (Coords) o;
            return c.x == x && c.y == y;
        }

        public Coords(int x, int y) {
            super();
            this.x = x;
            this.y = y;
        }

        public int hashCode() {
            return new Integer(x + "0" + y);
        }
    }

    public static void main(String args[]) {

        HashMap<Coords, String> map = new HashMap<Coords, String>();

        map.put(new Coords(65, 72), "Dan");

        map.put(new Coords(68, 78), "Amn");
        map.put(new Coords(675, 89), "Ann");

        System.out.println(map.size());
    }
}