Java Community | Help. Code. Learn.•8mo ago

Filling array with same object reference

playerParty[0] = new PlayerParty(new Vector2D(screenCenter.x-100,screenCenter.y),
                new PlayableEntity[]{
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this)
        });

playerParty[0] = new PlayerParty(new Vector2D(screenCenter.x-100,screenCenter.y),
                new PlayableEntity[]{
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this)
        });

get characters returns this return new PlayableEntity(gamePanel, "player",new Stats(100,20)); i thought this would make the playable entities inside of the array different intances of the same object, but for some reason all the changes i make the one playable entities in the array are applied to all other playable entities

17 Replies

JavaBot•8mo ago

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Unknown User•8mo ago

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asdruOP•8mo ago

yeah i know, but i didn't use that because i will different characters

Unknown User•8mo ago

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asdruOP•8mo ago

oh, i should have mentioned in the title that that's the unwanted behaviour my bad rn if i add the players to the array and for example change the position of one, the position of all of them changes. i dont want that

Unknown User•8mo ago

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asdruOP•8mo ago

but how would apply this to my case? the array has 4 elements, which in my game means that the party can have a max of 4 characters. the characters inherit the playableEntity traits and override some functions i have a bit of an odd setup cause im fairly new at this, but all i need is to find a way to make the getCharacter function return a new instance each time. so if i understand this correctly all the PlayableEntity objects inside the array should have different addresses in memory

Unknown User•8mo ago

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asdruOP•8mo ago

i know oop, but its my first time making a big java project but i think the root of my issue is the fact that this

public static PlayableEntity getCharacter(Characters c,GamePanel gamePanel){
        if(c==Characters.PLAYER) return new PlayableEntity(gamePanel, "player",new Stats(100,20));
        else return null;
    }

public static PlayableEntity getCharacter(Characters c,GamePanel gamePanel){
        if(c==Characters.PLAYER) return new PlayableEntity(gamePanel, "player",new Stats(100,20));
        else return null;
    }

returns the same address each time, which i dont really understand why

Unknown User•8mo ago

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asdruOP•8mo ago

ah ok thanks

JavaBot•8mo ago

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asdruOP•8mo ago

i'll see if that fixes the issue

Unknown User•8mo ago

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asdruOP•8mo ago

i still have the same issue ignore the fact that im repeating the same line of code 8 times to create the players https://github.com/asdru22/JavaGame/blob/main/src/main/java/main/Game.java the getCharacter function is behaving weird https://github.com/asdru22/JavaGame/blob/main/src/main/java/entity/PlayableEntity.java i have the two parties, both with 4 characters, however if i run the program i see only one character per party, which is odd considering i have a function that offsets the character position

asdruOP•8mo ago

i did some debugging and found that all the PlayableEntities in the arraylist are same object instance, otherwise i cant really explain why the position of all characters is the one of the last offset

public void initializeCharacters(){
        initializeCharacter(party.get(0), new Vector2D(-20,-75));
        initializeCharacter(party.get(1), new Vector2D(20,-25));
        initializeCharacter(party.get(2), new Vector2D(-20,25));
        initializeCharacter(party.get(3), new Vector2D(20,75));

        System.out.println("current pos: "+party.get(0).pos);

public void initializeCharacters(){
        initializeCharacter(party.get(0), new Vector2D(-20,-75));
        initializeCharacter(party.get(1), new Vector2D(20,-25));
        initializeCharacter(party.get(2), new Vector2D(-20,25));
        initializeCharacter(party.get(3), new Vector2D(20,75));

        System.out.println("current pos: "+party.get(0).pos);

oh god i found the issue... it had nothing to do with what i just said

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Filling array with same object reference

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