CODEWITHSUNDEEP
java
user311699
user311699

Reputation: 27

Thread sleeping works differently than expected

I'm fairly new to Java and would like to know where I'm going wrong with this code

    for(int i=0; i<10; i++) {
        textArea.setText("\n***Iterate***\n");
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e1) {
            // TODO Auto-generated catch block
        }
    }

what I expect for this to do is for every iteration, it should have an interval of a second. But what happens is that when it runs, it sleeps for 10 seconds, and then the for loop runs as how it would without the thread.sleep().

Upvotes: 0

Views: 32

Answers (1)

markspace
markspace

Reputation: 11020

If this is being done on the EDT (which you should because you're updating a Swing component), then it's because you're blocking the EDT for 10 seconds.

Consider a Swing timer instead. https://docs.oracle.com/javase/tutorial/uiswing/misc/timer.html

class MyActionListener implements ActionListner {
  Timer mytimer;
  int count;
  public void actionPerformed(ActionEvent evt) {
    textArea.setText("\n***Iterate***\n");
    if( ++count > 10 ) mytimer.stop();
  }
};

MyActionListener task = new MyActionListener();
Timer timer = new Timer(1000, task )
task.mytimer = timer;
timer.setRepeats( true );
timer.start();

Code is untested.

Upvotes: 1

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