CODEWITHSUNDEEP
javaswinguser-interfacethread-sleep
Subhiksh
Subhiksh

Reputation: 301

How to use sleep(or something similar to sleep) with GUI

I'm using java swings for my application. Below is the piece of my code. However I know that Thread.sleep() should not be used with swings. I read some posts that says to use Timer from javax.swing.timer But for the below code I do not know how to implement it. 

public void mouseClicked(MouseEvent e) {
     try{
        demo.main("Welcome");
        Thread.sleep(900);
        demo.main("Argument to main");
        Thread.sleep(900);
        demo.main("Argument to main");

        // after this I call a method say `xyz` which also uses Thread.sleep() 
        // and this `xyz` method uses variables that are updated in `demo.main()`

       }catch(Exception e){
           e.printStackTrace();
   }

How can I implement the same behaviour as sleep?

EDIT:

Upvotes: 0

Views: 487

Answers (3)

OldCurmudgeon
OldCurmudgeon

Reputation: 65793

I would use a ScheduledExecutorService and an ordered list of actions. Using enum is good for this. This enum could then implement a simple functional interface. 

ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);

enum ClickAction {
    Action1(900) {
        @Override
        void execute() {
            message("Welcome");
        }

    },
    Action2(900) {
        @Override
        void execute() {
            message("Another message");
        }

    };
    private final int delayAfter;

    private ClickAction(int delayAfter) {
        this.delayAfter = delayAfter;
    }

    abstract void execute();
}

private static void message(String msg) {
    System.out.println("msg=" + msg);
}

public void mouseClicked(MouseEvent e) {
    int delay = 0;
    for (ClickAction action : ClickAction.values()) {
        // Schedule it.
        executor.schedule(() -> {
            action.execute();
        }, delay, TimeUnit.MILLISECONDS);
        // Add up all of the delays.
        delay += action.delayAfter;
    }
}

Upvotes: 1

Freddie Coleman
Freddie Coleman

Reputation: 479

CountDownLatch may do what you want.

For example:

public void mouseClicked(MouseEvent e) {
    try{
        final CountDownLatch latch = new CountDownLatch(1);
        demo.main("Welcome", latch);
        latch.await();
    }catch(Exception e){
        e.printStackTrace();
    }
}

Then in main you would call latch.countDown() to continue beyond the await.

Upvotes: 0

Brian Agnew
Brian Agnew

Reputation: 272217

I would simply spawn off a new thread e.g. (the simplest example)

Thread t = new Thread(new Runnable() {
   public void run() {
     demo.main("Welcome");
     Thread.sleep(900);
     demo.main("Argument to main");
     Thread.sleep(900);
     demo.main("Argument to main");
   }
});
t.start();

since you don't want block the Swing update thread (as you've noted). The above will invoke your demo class in a background thread. I would perhaps investigate Java multithreading further - if you have more complex requirements you may wish to use higher level constructs than the simple Thread object presented here.

Upvotes: 0

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