[JFrame with TextFields error] [SOLVED]

Newbie & Debugging Questions
#1

SOLVED: I’m lame sorry guys:


	public void keyPressed(KeyEvent e) {
		int ID = e.getKeyCode();
		if (ID == 8) { /* Backspace Button */
			if (userNameField.getText().length() == 0) {
				e.consume();
			}
		}
	}

Hello JGO :o
I have a JFrame, it contains 2 JTextField’s, and multiple JPanel’s (JPanel’s are painting constantly).

Whenever I have one of the TextField’s selected, if I hit ‘back space’ it causes my JPanel’s paint rate to significantly speed up?

Picture:

Note: While I hit backspace, this glitch only occurs while there’s NO text in the field.

I could supply some source code, if need be.
(How I noticed this was that the physics of the spheres would speed up)

#2

I know you already solved this, but I suggest using the [icode]KeyEvent[/icode] constants for better readability:


   public void keyPressed(KeyEvent e) {
      int ID = e.getKeyCode();
@@      if (ID == KeyEvent.VK_BACK_SPACE) { /* Backspace Button */
         if (userNameField.getText().length() == 0) {
            e.consume();
         }
      }
   }

[icode]KeyEvent.VK_BACK_SPACE[/icode] is exactly this in source code: [icode]public static final int VK_BACK_SPACE = 8;[/icode].

I guess you already know this… I’m just sayin, because it’s better readable :slight_smile:

#3

Thanks, I know a couple java constants which I use alot, easier to just write the digit XD:


3
vs:
JFrame.DEFAULT_CLOSE_OPERATION

This was and still is a rather interesting glitch though.
On a JTextField/JPasswordField/JTextArea, if while it’s blank the user hits ‘Backspace’ or ‘Del’, it causes all the JPanels on the same JFrame to tweak out lol, compare it like a steady FPS rate of 2, which increases to 100 FPS.
Wierd :stuck_out_tongue:

#4

Using magic numbers defeats the purpose of the constants in the first place; it makes your code harder to read and more difficult to debug, and also makes it much more error prone.

Instead you should use IDE auto-completion if you are getting tired of typing things out.

You will probably come to realize the importance as you begin to make more complex applications.

#5

Lolz, I used IDE auto-completion to find out the actual variable value in the first place.
If I find out it’s ‘one’ character long in length, why would I type 20+ characters?
I said I know a couple of constants lol, and I use them quite often, wouldn’t type the longer version for somebody else s eyes.
I’m the only one browsing my code for the most part O.O

#6

Do you give your classes and methods single-character names as well? It would make your code even more terse!

#7

Guys, keep cool.

If he wants to do it that way, let him just do it that way. You learn from mistakes.

#8

Would you type:


ch.setLocalTranslation(settings.getWidth() / 2 - guiFont.getCharSet().getRenderedSize() / 3 * 2, settings.getHeight() / 2 + ch.getLineHeight() / 2, 0);

Or this:


ch.setLocalTranslation(x, y, 0);

So yes noob, I do name ‘variables’ with 1 letter sometimes, maybe you should try it, stop criticizing lulz.
As for method names no rofl, how did it get to method names, starting from ‘known’ constants?