Swing JProgressBar Class – Learn SWING in simple and easy steps starting from basic to advanced concepts with examples including Overview, Environment. Java JProgressBar example with topics on JButton, diifference between AWT and swing, JRadioButton, JTextField, JTextArea, JList, The JProgressBar class is used to display the progress of the task. It inherits Computer Network tutorial. JProgressBar – Java Swing: JProgressBar It is visually displays the progress of some task. setStringPainted(boolean value): Sets the value of.
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To adjust the minimum progress time required for a dialog to appear, invoke setMillisToPopup.
This value is used by the monitor to set up the progress bar in the dialog. In the Java look and feel, indeterminate progress bars look like this:.
You can set the string to be displayed with setString. Below is the code from ProgressBarDemo.
JProgressBar « Swing « Java Tutorial
As jorogressbar as the progress bar can display more meaningful information, you should switch it back into its default, determinate mode. To omit the status note from the dialog, provide null as the third argument to the monitor’s constructor. Push the Start button. This note is displayed on the dialog. Click the OK button.
SWING – JProgressBar Class
The other changes in the code are related to string display. You can get the stream’s progress monitor with a call to jprogresbar and configure it as described in How to Use Progress Monitors. If, after two seconds, the progress monitor’s progress is less than its maximum, the monitor will bring up the dialog. The user can cancel the task by clicking the Cancel button on the dialog.
For example, the following code makes the wait cursor be displayed when the cursor is over container including any components it contains that have no cursor specified: A progress bar in indeterminate mode displays animation to indicate that work is occurring. Here’s a picture of a small demo application that uses a progress bar to measure the progress of a task that runs in its own thread:.
How to Use Progress Bars
Create a progress monitor. The following tables list the commonly used API for using progress bars and progress monitors. The second tells the progress monitor to wait two seconds before deciding whether to bring up a dialog.
Progress monitor provides a way for the user to dismiss the dialog while the task is still running. Set or get whether the progress bar displays a percent string. Another way of indicating work is to set the wait cursor, using the Cursor class and the Component -defined setCursor method.
You can show work without measurable progress by putting the progress bar in indeterminate mode. The doInBackground method of the SwingWorker jprogreessbar used to manage the progress bar. The value is constrained by the minimum and maximum values. Make the progress bar’s reference available to work – either pass it in as an argument to workor provide an accessor method that your code in work can call to get a reference to the progress bar.
The first argument provides the parent component to the dialog popped up by the progress monitor.
Creating Progress Bar Using JProgressBar Class
The user can cancel the task by clicking the Cancel button on the dialog. Now let’s rewrite ProgressBarDemo to use a progress monitor instead of a progress bar. Later, when tutorila progress bar switches from indeterminate to determinate mode, invoking setString null makes the progress bar display its default string. One way of indicating work, and perhaps the amount of progress, is to use an animated image.
Modification of the previous example that uses a progress monitor instead of a progress bar.
The example updates the note each time the timer fires an action event.