Java notes-Use the Swingwoker class to complete time-consuming operations

Use the Swingwoker class to complete the time-consuming operation:

For time-consuming operations in swing, it is common to run in a new thread to prevent the program from "Suspended animation."
In java6.0, you can use the Swingwoker class to complete

swingwoker<t,v> is an abstract class that performs long-time GUI interaction tasks in a dedicated thread. With swing
There are two constraints to keep in mind when writing a multithreaded application:
1. You should not run time-consuming tasks on the event assignment thread, or the application will not respond.
2. The swing control can only be accessed on the event assignment thread
Note: It is often necessary to place time-consuming tasks in the Doinbackground () method of the Swingwoker class
Perform:
protected abstract T Doinbackground () throws Exception

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code example:

 PackageCom.xhj.thread;ImportJava.awt.Button;ImportJava.awt.Label;Importjava.awt.event.ActionEvent;ImportJava.awt.event.ActionListener;Importjava.util.Arrays;ImportJava.util.Random;ImportJavax.swing.JFrame;ImportJavax.swing.JPanel;ImportJavax.swing.SwingWorker;/** * @authorXiehejun **/ Public classUsedswingwokerthreadextendsJFrame {PrivateLabel lable; Privatebutton button;  PublicLabel getlable () {returnlable; }     Public voidsetlable (Label lable) { This. lable =lable; }     PublicButton Getbutton () {returnbutton; }     Public voidSetbutton (Button button) { This. Button =button; }    Private classNumberarraryextendsSwingworker<void, integer>{@OverrideprotectedVoid Doinbackground ()throwsException {Button.addactionlistener (NewActionListener () {@Override Public voidactionperformed (ActionEvent e) {int[] Numarrary =New int[1000];  for(inti = 0; i < 1000; i++) {Numarrary[i]=NewRandom (). Nextint (); System.out.println (i+ "Numbered:" +Numarrary[i]);                    } arrays.sort (Numarrary); System.out.println ("The maximum number of random numbers generated is:" + numarrary[numarrary.length-1]); Lable.settext ("The maximum number of random numbers generated is:" + numarrary[numarrary.length-1]);            }            }); return NULL; }    }    /**     * @paramargs*/     Public Static voidMain (string[] args) {usedswingwokerthread Usedswingwoker=NewUsedswingwokerthread (); JFrame Frame=NewJFrame (); JPanel Panel=NewJPanel ();        Frame.setcontentpane (panel); Frame.setvisible (true); Usedswingwoker.setlable (NewLabel ("click button to generate a random array"))); Usedswingwoker.setbutton (NewButton ("Start Build"));        Frame.add (Usedswingwoker.getlable ());        Frame.add (Usedswingwoker.getbutton ()); Numberarrary Arrarys= Usedswingwoker.Newnumberarrary (); Try{arrarys.doinbackground (); } Catch(Exception e) {e.printstacktrace (); }    }}

Note: Swingwoker Life cycle and thread
1. Current thread: Call the Execute () method on the thread. It dispatches Swingwoker to execute on the worker thread and returns immediately.
You can use the Get method to wait for Swingwoker to complete.
2.Worker Thread: Call the Doinbackground () method on the thread. All background activity should occur on this thread.
To notify Propertychanglisteners about changes to the binding (bound) attribute, use the Firepropertychang
and Getpropertychangesupport () method, by default, there are two binding properties available, namely State and progress
3. Event Assignment Thread: all swing-related activities occur on that thread. Swingwoker calls the process and done () methods,
and notifies all propertychanglistener of the thread.