JPasswordField KeyPress string length error?

Question

I am trying to change background colors of a JPasswordField in Java Swing (Netbeans).

Here\'s what I have:

private void pstxtPasswordKeyPressed(java.         


        

Answer 1

I solved the problem by using KeyRelease instead of KeyPress, try it out my friend

Answer 2

Since JPasswordField extends from JTextComponent, you can attach a DocumentListener to it which is a far safer manner to update the background color on each change of the contents.

Answer 3

if (userPassword.length() >= 7)

This if statement doesn't match your comments:

//If password is 8+ characters

The actual code says if there are 7+ characters, then turn the background green. So when you are backspacing, it should turn the background red when you are down to 6 characters left.

I think your confusion is shown in this comment:

//(one less because string counting begins at 0)

What you are trying to describe is that indexing a character in a String starts at 0, for example when you use charAt() or subString(). This means that the first character is at index 0, the second at index 1, etc. On the other hand, length() returns the number of characters in the String. This is has nothing to do with the indexing, so you don't need to subtract 1.

Answer 4

Use

private void pstxtPasswordKeyReleased(java.awt.event.KeyEvent evt) 

Instead of

private void pstxtPasswordKeyPressed(java.awt.event.KeyEvent evt) 

Answer 5

As an aside, examine the length of the array returned by getPassword(), rather than the length of a String constructed from that array. The String is a security risk, as it will be stored for an indefinite time with the easily found name userPassword.

Addendum: Here's a related example of Robin's suggestion to use DocumentListener. I'm guessing that your key listener is seeing the KeyEvent before the JPasswordField has processed it.