CODEWITHSUNDEEP
javaswingevent-dispatch-threadthread-sleep
Marin Bînzari
Marin Bînzari

Reputation: 5358

Swing, update textfield value within a for

I'm trying to update my Java Swing form within a for. I tried many ways, but it wasn't working. This is what I last tried:

for(int i=0; i<10; i++) {
    jTextField1.setText("" + i);

    try {
        Thread.sleep(500);
    }
    catch (InterruptedException ex) {
        Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
    }
}

Upvotes: 0

Views: 1845

Answers (2)

Ali VELI
Ali VELI

Reputation: 138

You can't make your jTextField1 variable 'final' but you can use a local variable declared final and set to your jTextField1 variable as I showed below...I used many times such approach in my coding, it works...

final jTextField local_var = jTextField1;



SwingUtilities.invokeLater(new Runnable() {



public void run() {


  for (int i=0; i<10; i++) {

        local_var.setText("" + i);

  }});

Upvotes: 1

Eugene
Eugene

Reputation: 530

I suppose you are trying to update component from external thread. In general, Swing is not thread safe, for more details take a look at this. Regarding to your code, try follow this approach:

for(int i=0; i<10; i++) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            jTextField1.setText("" + i);
        }
    });
}

Variable jTextField1 must be declared as final.

Upvotes: 0

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