How to make sure that values written in a textfield are the same using a simple loop function?

Question

I wrote a simple code just to check the values between textfields and compared whether they are the same or not. I want them to be the same, if not it will produce an error. It's about rewriting an email.

    String a = studentemail.getText();
    String b = rewritestudentemail.getText();

    if(a != b){
         JOptionPane.showMessageDialog( null, "Student Email rewritten incorrectly.","Error!",JOptionPane.OK_OPTION);

    }

The program persists that there is an error even though I indicated the same string values in both of the fields. Why's that?

Don't compare String values using `==`. Use `equals()`, so `!a.equals(b)` in your case. — Alexis C., Jan 22 '14 at 13:10

eKek0 · Answer 1 · 2014-01-22T13:26:59.280

0

Try:

if (!a.equals(b)) {
   ...

edited Jan 22 '14 at 13:26

answered Jan 22 '14 at 13:12

eKek0

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The "!" worked like wonder. Thank you eKek0!! :D – Shinji Jan 22 '14 at 13:34

score 0 · Accepted Answer · answered Jan 22 '14 at 13:13

Change your conditional to be this:

if(!a.equals(b))
{
   JOptionPane.showMessageDialog( null, "Student Email rewritten
   incorrectly.","Error!",JOptionPane.OK_OPTION);
}

Make sure you have the ! before a.equals(b)) since you only want the error to appear when they are not equal.

score 0 · Answer 3 · answered Jan 22 '14 at 13:18

0

rather layout your logic like this:

if (!a.equals(b)){
 //JoptionPane...
 }

In java two strings are compared by using the ".equals()" function.

answered Jan 22 '14 at 13:18

KnowlegdeSeeker

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2

How to make sure that values written in a textfield are the same using a simple loop function?

3 Answers3