store X and Y coordinates

There is a class in java called Class Point.

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

This is the same information provided on Java docs API 10:

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

A point representing a location in (x,y) coordinate space, specified in integer precision.

You can see an example, and also other important topics related in this link: 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);
  }
}

I hope this can help you!

There seems to be several issues:

• "Dan" is a String, not a Character
• case is important in Java (new coords(65,72) should be new Coords(65,72))
• Coords needs to be static to be instantiated without a reference to an instance the enclosing map class.

This should work:

static class Coords {
    ...
}

Map<Coords, String> map = new HashMap<Coords, String>();
map.put(new Coords(65, 72), "Dan");

ps: although you are allowed to name a local variable map within a class map, it is not a good idea to have such name collision. In Java, classes generally start in upper case, so you could rename your class Map. But it happens that Map is a standard class in Java. So call your class Main or Test or whatever is relevant. ;-)

Adding to @assylias

1. Make you inner class static in order to insert new objects like you have or new Outer().new Inner() .
2. Take care of Java Naming Convention

Code like:

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());
    }
}