从Java中的另一个类访问对象？

Question

i know that this question has been asked many types, but i am not getting trough the problem. So following. I have created a class that is creating array of 2 positions. The goal is to create point coordinates so i can generate several points later. Hier is my code

import java.util.Random;

public class Coor {



private static int[] coord;

public static int[] generate(){
    coord = new int[2];   
    return coord;
}

public static void printX(){

        System.out.println("X = " + coord[0] );

}
public static void printY(){

    System.out.println("Y = " + coord[1] );

}

public static int randomFill(){
    Random rand = new Random();
    int randomNum = rand.nextInt(99);
    return randomNum;
}

public static void main(String args[]) {

      generate();
        for(int i = 0; i < 2; i++){
            coord[i] = randomFill();
        }
        printX();
        printY();
    }


}

So, this is working perfect, but what I want is to create the points in another class and to use them there, but I have no idea how to achieve this. I am new to java, and I have almost understood some examples in the oracle docs, but can not implement it. Can you please help me a little? I just need one example class which is obtaining the coordinates of the points, after that I can extend it alone for my needs.

Answer 1

You should not make your data static and you should provide a public constructor see below.

public class Coord {

private int[] coord;

public Coord(int x, int y) {
    coord = new int[2];
    coord[0] = x;
    coord[1] = y;
}

public void printX(){
    System.out.println("X = " + coord[0] );
}

public void printY(){
    System.out.println("Y = " + coord[1] );
}

public static void main(String[] args) {
    Coord c1 = new Coord(10, 11);
    Coord c2 = new Coord(23, 14);
}
}