Java Programming: Let's Build a Game #8

In this video we create a boss for our game! If you have any questions then be sure to leave a comment or contact me on twitter; realtutsgml. If you learned something then be sure to leave a like, comment, and favorite.

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[yh_hat_trick]

For Develping purposes, I always had the idea of secret dev features to like regenerate health and stuff. Not only is it fun on multiplayer games(If I ever make one), It's also useful. So, along the way, I recommend you set buttons to say, idk, stop the score timer, directly add bosses, etc. It makes things alot easier when trying to fix bugs, and it's cool to screw around. i have the R key set to reset my health.

[andrewcarosi]

the reason your first clearEnemys() didn't work is because when you removed the item of that index value the item that was next took its place and was essentially skipped easy fix include i-- when an object is removed

[MrLingon]

Yo this is way late and all but I'm takin a shot at it anyway. How would you go about rendering images? I'm currently trying to do so in my java game but I end up dropping to 7fps when there is more than one image on screen at a time.

[WolfrostWasTaken]

To quickly fix the problem with the value of EnemyBoss.velX, just write
velX += 0.01f*Math.signum(velX);
That should work perfectly

[kallekurttio]

The problem occured at 21.54, is due to the loop. You're actually looping through all of the objects, using i++. Whilst removing an object, the list will shorten, as i increases, which makes the loop skip a few objects. You should always loop from "object.Size() -1" and then decrease i by one, with the condition of i > -1. A conventional for-loop, reversed.

(Example):

for(int i = object.size() -1; i > -1; i(--)){
GameObject tempObject = object.get(i);

if(tempObject.getID() == ID.SmartEnemy || tempObject.getID() == ID.<any enemy>){
object.remove(i);
}

Instead of listing every enemy-type in the condition, you can just say something such as "if ID != player, remove"~~

parenthesis around the double negative, is due to youtubes html-codes..

[wolfalpha]

if you want your player to be rainbow do this go to your player class and first thing you have to go to

public void render(Graphics g) {
g.setColor(Color.BLUE);
g.fillRect((int)x, (int)y, 0, 0);
once set those numbers to 0
then go to your trail and delete your trail that you had before
and do this

handler.addObject(new Trail(x, y, ID.Trail, Color.red, 32, 30, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.orange, 30, 28, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.yellow, 26, 24, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.green, 24, 22, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.blue, 22, 20, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.magenta, 18, 16, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.CYAN, 18, 16, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.PINK, 16, 14, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.RED, 14, 12, 0.05f, handler));
handler.addObject(new Trail(x, y, ID.Trail, Color.BLACK, 12, 10, 0.05f, handler));

enjoy


}


}

FREE to copy paste!

[ethanladwig]

one thing about the timers is that they depend on the fps
(i think)

[ThePhantomLotus]

I know this is a few years late, but the entire clearEnemies method can be boiled down to 1 line:

object.removeIf(x -> x.getId() != ID.Player);

This method goes through the entire list and removes any objects that are not the player. No loop needed.

[leonidas]

For those wondering how he's changing the number in debug mode.. He hits the green bug icon, changes the number in the code, then hits ctrl+s
This lets you modify the program while its still running.

[edgarpoefan]

Regarding the issue with enemy removal at 22:00 -> I wondered about what we would have to do if the Player object had more information than it does in this particular game, and what we could do instead to try and remove all the other enemies rather than re-creating the player; I found this to work:

LinkedList<GameObject> deathList = new LinkedList<GameObject>();

for (GameObject tempObject : objects) {
if(tempObject.getID() != ID.Player){
deathList.add(tempObject);
}
}

objects.removeAll(deathList);
deathList.clear();

Any reason this is a bad idea? (Aside from momentarily creating a copy of every enemy object which may be a problem for memory?)

[GPlayerHD]

hey man, great series hope you keep with it, I'm waiting anxiously to every episode, and if possible, can you do a video about death of the player? I can't find anything on internet and I'm going insane, can't figure it out!!! I need your help, I can do almost everything by myself, but the death and the menu system is bugging my mind haha.

[ShadowCooper]

Ayy i did the same thing with the timer thing but with clamping the y value (only y because it doesn't move left or right) and i used the if statement from before but got rid of the first part from before the ||!!! i finally figured out something awesome i am actually learning from your tutorials they are awesome!

[FzTxLaNcer]

Menu system or game states would be reeeal nice, also, do more tutorials please this one was awesome

[Phobiac]

With Linked Lists it is better to iterate through them backwards in order to avoid the problem that you had it the clearEnemies() method. In other words "for(int i = object.size() -1; i > 0; i--)" is how your for loop should look. I realize this video is 5 years old but just in case someone gets stuck with this.

[pekymanxxx]

Set the 
handler.addObject(new EnemyBoss((Game.WIDTH / 2) - 48, -120, ID.EnemyBoss, handler));
to
handler.addObject(new EnemyBoss((Game.WIDTH / 2) - 48, -160, ID.EnemyBoss, handler));

So just change "-120" to "-160" if you don't want to have that glitch where you can go up and avoid all bullets by boss.. Sorry for my bad English but i hope you understand me :D

[SZakiabba]

I made two players in my game but when the Boss stage arrives, the player2 spawns where the Player1 is located at, how can I fix this so player2 stays where it is at when the Boss stage arrives?

[gambitdevs]

Amazing tutorials, your getting me into java :D Will you do more tutorials for it?

[JSkipper]

I have a question on platform games. I am currently trying to recreate a sonic game for practice, and what I am having trouble with are sloped tiles. I'm using a .txt file for my map and basically have either free space or collision. Is it possible using a .txt map file to create sloped tiles? Thanks and I love your videos. There really helpful.

[BenMgaming]

I love your vids (really informative and interesting) but please use OOP. Instead of copy-pasting every enemy class, create an "Enemy" class that inherits GameObject, and every enemy type will just inherit it

[therapy]

Following Carosi's comment I copied my GameObject LinkedList into an ArrayList and it works great now.

Hope this helps :_

public void clearEnemys()
{
List<GameObject> tempList = new

for(int i = 0; i < object.size(); i++)
{
GameObject tempObject = tempList.get(i);
if(tempObject.getId() != ID.Player)
removeObject(tempObject);
}
}