Progressbar

[bubbless]

Hi

I'm making a program that performs a quite long task and I want to use an indetermine progressbar.
However, the progressbar only starts when my task is completed.
I've done some searching and I think I have to use threads.
But when I try it, it doesn't work.
Could someone make a simple example how I can use this with a progressbar?

Code.

public class LongTask {
	
	public static void main(String[] args) {
		Functions functions = new Functions();
		functions.run();
	}
}

public class Functions implements ActionListener, Runnable {
	[variable declaring]
	
	public void run() {
		window = new JFrame("Task");
		window.setSize(300,300);
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		input = new JTextField(20);
		submit = new JButton("Do it");
		progressBar = new JProgressBar(0, 99);
		
		submit.addActionListener(this);
		
		SpringLayout layout = new SpringLayout();
		Container contentPane = window.getContentPane();
		contentPane.setLayout(layout);
		
		contentPane.add(input);
		contentPane.add(submit);
		contentPane.add(progressBar);
		contentPane.add(result);
		
		layout.putConstraint(SpringLayout.WEST, input, 5, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, input, 5, SpringLayout.NORTH, contentPane);
		layout.putConstraint(SpringLayout.WEST, submit, 5, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, submit, 60, SpringLayout.NORTH, contentPane);
		layout.putConstraint(SpringLayout.WEST, progressBar, 5, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, progressBar, 100, SpringLayout.NORTH, contentPane);
		layout.putConstraint(SpringLayout.WEST, result, 5, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, result, 200, SpringLayout.NORTH, contentPane);
		
		window.setVisible(true);
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		progressBar.setIndeterminate(true);
		[long task]
	}
}

[Fubarable]

You are doing your task on the EDT or "Event Dispatch Thread", the main thread that runs Swing application drawing and user interaction, and this will freeze the GUI. Please read this tutorial: Concurrency In Swing

[bubbless]

I did read it and I now use SwingWorker but the result is thesame.

	SwingWorker<String, Void> task = new SwingWorker<String, Void>() {
		@Override
		public String doInBackground() throws Exception {
			[long task]
		}
	}

	public void actionPerformed(ActionEvent e) {
		progressBar.setIndeterminate(true);
		task.run();
		progressBar.setIndeterminate(false);
		progressBar.setStringPainted(true);
		progressBar.setValue(99);
	}

[Fubarable]

I thought that you would call task.execute() to get a SwingWorker to run, not "run()". Also, have you had a look at the Sun tutorial on ProgressBars? It shows how to have them work with SwingWorker objects. Hope this helps, and kind regards.

[bubbless]

It was indeed task.execute().
Thanks for your help.