Weird xlint error with my linkedlist adding method

[gsquare567]

check this:

code:

GalacticWar.java:975: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);

where getSprites() returns a LinkedList of type AnimatedSprite, and bullets[] is an array of animatedsprite. what could be the problem? ps, this is 28x plus another error... read here:

code:

C:\Program Files\Xinox Software\JCreatorV3LE\MyProjects\Asteroids\classes>javac -Xlint GalacticWar.java GalacticWar.java:157: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                 getSprites().add(ship);                                 ^ GalacticWar.java:555: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                 getSprites().add(ship);                                 ^ GalacticWar.java:599: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                 getSprites().add(asteroid);                                 ^ GalacticWar.java:691: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                 getSprites().add(asteroid);                                 ^ GalacticWar.java:708: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                 getSprites().add(expl);                                 ^ GalacticWar.java:725: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                 getSprites().add(expl);                                 ^ GalacticWar.java:792: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(powerup);                                                 ^ GalacticWar.java:799: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(powerup);                                                 ^ GalacticWar.java:806: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(powerup);                                                 ^ GalacticWar.java:813: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(powerup);                                                 ^ GalacticWar.java:820: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(powerup);                                                 ^ GalacticWar.java:827: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(powerup);                                                 ^ GalacticWar.java:920: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:926: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:930: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[1]);                                                 ^ GalacticWar.java:936: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:939: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[2]);                                                 ^ GalacticWar.java:943: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[2]);                                                 ^ GalacticWar.java:949: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:953: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[1]);                                                 ^ GalacticWar.java:957: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[2]);                                                 ^ GalacticWar.java:961: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[3]);                                                 ^ GalacticWar.java:967: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:971: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:975: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:979: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:983: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:987: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.LinkedList                                 getSprites().add(bullets[0]);                                                 ^ GalacticWar.java:8: warning: [serial] serializable class GalacticWar has no defi nition of serialVersionUID public class GalacticWar extends Game        ^ 29 warnings

[wtd]

Of you're using Java 1.5 and collections, you'll need to be familiar with generics.

[gsquare567]

thanks for the help... now can anyone tell me why these are coming up?

[OneOffDriveByPoster]

gsquare567 wrote:

thanks for the help... now can anyone tell me why these are coming up?

Check your method signature for getSprites(). wtd is right, get used to generics if you are using Java 1.5.

[wtd]

We know of what we speak.

code:

import java.util.ArrayList; public class Foo {    public static void main(String[] args) {       ArrayList arr = new ArrayList();           int i = 5;                      arr.add(i);    } }

code:

$ javac -Xlint:unchecked Foo.java Foo.java:8: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.ArrayList           arr.add(i);                  ^ 1 warning

code:

import java.util.ArrayList; public class Foo {    public static void main(String[] args) {       ArrayList<Integer> arr = new ArrayList<Integer>();           int i = 5;                      arr.add(i);    } }

code:

$ javac -Xlint:unchecked Foo.java $

[gsquare567]

thanks, but it still doesn't work... heres how i declare the LinkedList:

code:

private LinkedList<AnimatedSprite> sprites; sprites = new LinkedList<AnimatedSprite>();

and heres how i call it:

code:

public LinkedList getSprites()         {                 return sprites;         }

i still get the same message, and can you also look at the very last error, something about serialVersionUID?

[OneOffDriveByPoster]

Check the method signature; what is different from your declaration of sprites? Your code below:

Java:

private LinkedList<AnimatedSprite> sprites; public LinkedList getSprites() { /* ... */ }

Re: serialVersionUID:
http://java.sun.com/j2se/1.5.0/docs/api/java/io/Serializable.html

[gsquare567]

OH NO WAY MAN U R GOD! public LinkedList<AnimatedSprite> getSprites()... your a genious!

[gsquare567]

umm hmm... got rid of the "recompile with -Xlint", but now wen i run the internet file, the applet wont work. says "Loading Java Applet Failed"... i did everything required to run an applet, so why isnt it working?

[gsquare567]

any1?

[wtd]

Which browser are you using?

[gsquare567]

firefox, but it worked b4 for 2 other games. i even copied the htm file for the other two and just renamed it + the "code = " parameter

[gsquare567]

heres another problem, might be connected... i cant make a jar file. heres the error message:

code:

C:\Program Files\Xinox Software\JCreatorV3LE\MyProjects\Asteroids\src\Version 3> jar cvfm GalacticWar3.jar manifest.txt *.* java.io.IOException: invalid header field         at java.util.jar.Attributes.read(Attributes.java:389)         at java.util.jar.Manifest.read(Manifest.java:167)         at java.util.jar.Manifest.<init>(Manifest.java:52)         at sun.tools.jar.Main.run(Main.java:123)         at sun.tools.jar.Main.main(Main.java:903)

ps, i include a manifest called manifest.txt plus all the classes needed. the manifest is 3 lines, Main-Class: GalacticWar + 2 blank lines

[Aziz]

using generics would cause that problem, try and step back a few steps in your code (ie. undo a bit, then add in the <> bit). Also, make sure your browser has an up-to-date JRE plug-in installed. The latest is 6 (or 1.6) but that's a prerelease, so 5 (update 9) should be fine

[gsquare567]

i based my entire game on the LinkedList which is where i store the sprites or objects on the screen... so i'll try downloading the latest plugin and update, i'll get back to you to tell you if it still doesnt work.