CODEWITHSUNDEEP
javacoordinates
Djchunky123
Djchunky123

Reputation: 167

store X and Y coordinates

Hi im new to this site and need help with a program im working on. the problem im having is that i cant seem to store string and two integers (as the coordinates). i have looked at other code but dont see how the values are stored. below is the code ive been using. the code seems to be fine but when trying to stored the values i cant put multiply integers. thanks for your time 

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");
    }

}

Upvotes: 12

Views: 107895

Answers (5)

S. Mayol
S. Mayol

Reputation: 2625

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!

Upvotes: 22

Candida Sylta
Candida Sylta

Reputation: 11

package Lecture3;

import java.util.Scanner;

public class lecture9 {

    private int nInleste;

    public lecture9() {/*
                         * tabell/ // T/*chapter 6 in the books.
                         **/
    }

    public static void main(String[] args) {
        Scanner inn = new Scanner(System.in);
        int nInleste = 3;
        double[] tall = new double[nInleste];
        double sum = 0;
        for (int i = 0; i < nInleste; i++) {
            System.out.println("Leste en tall!");
            tall[i] = inn.nextDouble();
            sum += tall[i];
        }
        System.out.println(sum);
        double snitt = nInleste / nInleste;
        System.out.println("Gjennomsnittsverdien:" + snitt);
        for (int i = 0; i < nInleste; i++) {
            double aavik = tall[i] - snitt;
            int avvivk = 0;
            System.out.println(i + 1 + " Tal sitt avvik fra gjennomsnittet " + avvivk);

        }
    }/* end of the main methods */

}

Upvotes: 1

satvinder singh
satvinder singh

Reputation: 1152

if you have problem with your code you can try this , simple code to store string and two int values into a map

class MyCoord{
    private int X;
    private int Y;

    public MyCoord() {
        this(0,0);
    }        
    public MyCoord(int X, int Y) {
        this.X = X;
        this.Y = Y;
    }
    public int getX() {
        return X;
    }
    public int getY() {
        return Y;
    }
    public void setX(int X) {
        this.X = X;
    }
    public void setY(int Y) {
        this.Y = Y;
    }
}

//main class begins

public class  PointDemo{
    public static void main(String[] args) {

        Map <String,MyCoord> multiplePoints=new HashMap<String, MyCoord>();
        multiplePoints.put("point1", new MyCoord(10, 20));
        multiplePoints.put("point2", new MyCoord(100, 2000));

        MyCoord coord=multiplePoints.get("point1");
        System.out.println(coord.getX() +" : "+coord.getY());              
    }
}

Upvotes: 0

assylias
assylias

Reputation: 328608

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. ;-)

Upvotes: 9

amicngh
amicngh

Reputation: 7899

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());
    }
}

Upvotes: 1

Related Questions