Java Velocity Help

[DanTheDonut]

Ok. So I am currently learning Java in my free time, and I cant find out whats wrong with my code. When I try making an object move with velX = 1, it doesnt work. I believe its to due with the Tick function, or somthing else, but I dont know how to fix it. Heres my simple code (to most). Please help me

 

[Harry]

Are you getting some sort of error or is it just not working?

 

[DanTheDonut]

Are you getting some sort of error or is it just not working?

This is the error message I am getting.

Exception in thread "Thread-0" java.lang.NullPointerException
at com.game.main.Game.tick(Game.java:73)
at com.game.main.Game.run(Game.java:56)
at java.lang.Thread.run(Thread.java:748)

 

[Harry]

This is the error message I am getting.

Exception in thread "Thread-0" java.lang.NullPointerException
at com.game.main.Game.tick(Game.java:73)
at com.game.main.Game.run(Game.java:56)
at java.lang.Thread.run(Thread.java:748)

Yeah, I got that the first time and when I ran it again, it got this (which looks correct):

Spoiler: Output

X: 126584
Y: 200
velX: 1
velY: 0
X: 126485
Y: 100
velX: 1
velY: 0
X: 126585
Y: 200
velX: 1
velY: 0
X: 126486
Y: 100
velX: 1
velY: 0
X: 126586
Y: 200
velX: 1
velY: 0
X: 126487
Y: 100
velX: 1
velY: 0
X: 126587
Y: 200
velX: 1
velY: 0
X: 126488
Y: 100
velX: 1
velY: 0
X: 126588
Y: 200
velX: 1
velY: 0
X: 126489
Y: 100
velX: 1
velY: 0
X: 126589
Y: 200
velX: 1
velY: 0
X: 126490
Y: 100
velX: 1
velY: 0
X: 126590
Y: 200

 

[DanTheDonut]

Yeah, I got that the first time and when I ran it again, it got this (which looks correct):

Spoiler: Output

X: 126584
Y: 200
velX: 1
velY: 0
X: 126485
Y: 100
velX: 1
velY: 0
X: 126585
Y: 200
velX: 1
velY: 0
X: 126486
Y: 100
velX: 1
velY: 0
X: 126586
Y: 200
velX: 1
velY: 0
X: 126487
Y: 100
velX: 1
velY: 0
X: 126587
Y: 200
velX: 1
velY: 0
X: 126488
Y: 100
velX: 1
velY: 0
X: 126588
Y: 200
velX: 1
velY: 0
X: 126489
Y: 100
velX: 1
velY: 0
X: 126589
Y: 200
velX: 1
velY: 0
X: 126490
Y: 100
velX: 1
velY: 0
X: 126590
Y: 200

Did you change anything in it? For me it just keeps on saying the error message :/[DOUBLEPOST=1527286205][/DOUBLEPOST]

Did you change anything in it? For me it just keeps on saying the error message :/

Wait.. It says that for me too now, but it doesnt show any color now[DOUBLEPOST=1527286237][/DOUBLEPOST]

Did you change anything in it? For me it just keeps on saying the error message :/[DOUBLEPOST=1527286205][/DOUBLEPOST]
Wait.. It says that for me too now, but it doesnt show any color now

Anddd now it doesnt. ;-;

 

[Harry]

Did you change anything in it? For me it just keeps on saying the error message :/[DOUBLEPOST=1527286205][/DOUBLEPOST]
Wait.. It says that for me too now, but it doesnt show any color now[DOUBLEPOST=1527286237][/DOUBLEPOST]
Anddd now it doesnt. ;-;

Ah, I see what has happened. You're trying to start the game before you've initialised handler. This means that at the very first tick, the handler is null and so, you get a null exception (I believe).

Edit: Yep, just swap them around.

 

[DanTheDonut]

Ah, I see what has happened. You're trying to start the game before you've initialised handler. This means that at the very first tick, the handler is null and so, you get a null exception (I believe).

Edit: Yep, just swap them around.

View attachment 128813

So.. Switch the two?[DOUBLEPOST=1527286589][/DOUBLEPOST]

Ah, I see what has happened. You're trying to start the game before you've initialised handler. This means that at the very first tick, the handler is null and so, you get a null exception (I believe).

Edit: Yep, just swap them around.

View attachment 128813

Okay, so thats working now, But the setcolor isnt working now.. It should be setting the whole thing to black and having two white squares in it..

 

[Harry]

So.. Switch the two?

Yep, works for me. This means that you start the game after the handler has been initialised and so, no null exception should occur.

 

[DanTheDonut]

Yep, works for me. This means that you start the game after the handler has been initialised and so, no null exception should occur.

Yeah it works now, just the colors for me dont.. I said above ^^[DOUBLEPOST=1527287772][/DOUBLEPOST]

Yep, works for me. This means that you start the game after the handler has been initialised and so, no null exception should occur.

Do you know or have any clue as to how to make the colors work too?

 

[Harry]

Yeah it works now, just the colors for me dont.. I said above ^^[DOUBLEPOST=1527287772][/DOUBLEPOST]
Do you know or have any clue as to how to make the colors work too?

Had a quick look but couldn't see the problem. I will have a look tomorrow if you haven't solved it by then.

 

[DanTheDonut]

Had a quick look but couldn't see the problem. I will have a look tomorrow if you haven't solved it by then.

Alright I honestly cant find it xD

 

[Hassan R.]

Alright I honestly cant find it xD

Override the paintComponent(Graphics g) to set the color of your object.

 

[DanTheDonut]

Override the paintComponent(Graphics g) to set the color of your object.

How would you do this?

 

[Hassan R.]

How would you do this?

@Override
public void paintComponent(Graphics g) {
    // code
}

 

[DanTheDonut]

@Override
public void paintComponent(Graphics g) {
    // code
}

Thanks, but I had made it work by lowering the tick speed.