Java GUI Lesson 12 | Moving Graphics with arrow keys

teaching how to move a circle around with the arrow keys

Category:

Science & Technology

Tags:

• arrow
• keys
• up
• down
• left
• right
• java
• eclipse
• programming
• netbeans
• gui
• graphics
• keylistener
• jpanel
• jframe
• swing
• awt
• sun
• microsystems

[ComputerKing240]

Hey how can you count the number of times the arrow keys have been pressed can you help me with this please i really need it, Please and thank you

[macheads101]

@ComputerKing240 Just have an integer variable that you increment (add one to) every time the key event is fired.

[scottyy888]

I have a question, why did you need to have another application out for the JFrame and main method? you cant combine it all into one application?

[macheads101]

@scottyy888 If by application you mean class, you do not have to. Your main class could be a subclass of JFrame, but in general this is not good practice. Therefore, it's best to split your code up between multiple classes.

[malakov5]

the method to keep it from going off screen would be the window size?

[macheads101]

@malakov5 no i go over keeping it from going off screen in the previous tutorial

[hyperacidic009]

How can i stop the graphic from moving after i press a key??? pls help tnx

[JoeVirella]

@RockerNamedJoe same here

[Vaysm]

@RockerNamedJoe You need to repaint();

[8o8inSquares]

How do I make a black background?

[JavaHax0r]

@Hoobes1 Did you import it from javax.swing?

[Hoobes1]

Eclipse doesn't like the start() method for t. I don't know why, but I personally don't see a start() method it can refer to. It says "The method start() is undefined for the type Timer".

[RockerNamedJoe]

Mine moves but it leaves footprints. How to fix?!?

[JosephRobertCox]

Oval doesn't move on my side. Can somebody please share a link to full source code so i can compare. Thank you very much!

[JosephRobertCox]

@Lt0Th3M Same here

[0wner517]

@MinecraftingDaddio In your keyReleased(KeyEvent e) method set vely and velx to 0. That way whenever you stop holding a key down your velocities will be 0.