-Xlint???

[vastrolorde]

When compiling my project i get this kind of message:
"Note: rtype\Craft.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details."

code is :

package rtype;

import java.awt.Image;
import java.awt.event.KeyEvent;

import java.util.ArrayList;

import javax.swing.ImageIcon;

public class Craft {

    private String craft = "craft.png";

    private int dx;
    private int dy;
    private int x;
    private int y;
    private Image image;

    private ArrayList missiles;

    private final int CRAFT_SIZE = 20;

    public Craft() {
        ImageIcon ii = new ImageIcon(this.getClass().getResource(craft));
        image = ii.getImage();
        missiles = new ArrayList();
        x = 40;
        y = 60;
    }


    public void move() {
        x += dx;
        y += dy;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public Image getImage() {
        return image;
    }

    public ArrayList getMissiles() {
        return missiles;
    }

    public void keyPressed(KeyEvent e) {

        int key = e.getKeyCode();

        if (key == KeyEvent.VK_SPACE) {
            fire();
        }

        if (key == KeyEvent.VK_LEFT) {
            dx = -1;
        }

        if (key == KeyEvent.VK_RIGHT) {
            dx = 1;
        }

        if (key == KeyEvent.VK_UP) {
            dy = -1;
        }

        if (key == KeyEvent.VK_DOWN) {
            dy = 1;
        }
    }

    public void fire() {
        missiles.add(new Missile(x + CRAFT_SIZE, y + CRAFT_SIZE/2));
    }

    public void keyReleased(KeyEvent e) {
        int key = e.getKeyCode();

        if (key == KeyEvent.VK_LEFT) {
            dx = 0;
        }

        if (key == KeyEvent.VK_RIGHT) {
            dx = 0;
        }

        if (key == KeyEvent.VK_UP) {
            dy = 0;
        }

        if (key == KeyEvent.VK_DOWN) {
            dy = 0;
        }
    }
}

Could someone tell me whatswrogn here?

[JosAH]

You're using a 'raw' type ArrayList and the compiler warns against it.

kind regards,

Jos

[vastrolorde]

im following zetcode tutorial and there it says do it this way. What would be yor suggestion to fix it?

[JosAH]

im following zetcode tutorial and there it says do it this way. What would be yor suggestion to fix it?

Try another tutorial and in the mean time use a parameterized ArrayList<Missile> so your compiler knows about it.

kind regards,

Jos

[jim829]

From looking at your code, it should be

  private ArrayList<Missile> missiles;  // since Java 1.5
    private final int CRAFT_SIZE = 20;
    public Craft() {
        ImageIcon ii = new ImageIcon(this.getClass().getResource(craft));
        image = ii.getImage();
        missiles = new ArrayList<Missile>();
        x = 40;
        y = 60;
    }
   ...
   
  public ArrayList<Missile> getMissiles() { 
       return missiles;
  }

Regards,
Jim

[JosAH]

Last edited by jim829; Today at 07:49 PM. Reason: too late again!!

Hah! Finally! Victory is mine! Someone is even slower than I am! I'm going to be famous and filthy stinking rich! And ample supplies of scantily clad women! and ... and ... sorry, 't won't happen again.

kindest regards,

Jos ;-)

[vastrolorde]

ty for help. problem is solved now :P