SWT exception: org. Eclipse. SWT. swtexception: Invalid thread access

Attempt to modify the interface element in a thread other than the thread that created the SWT interface will throw the following exception

Exception in thread "thread-0" org. Eclipse. SWT. swtexception: Invalid thread access

At org. Eclipse. SWT. SWT. Error (SWT. Java: 2942)

At org. Eclipse. SWT. SWT. Error (SWT. Java: 2865)

At org. Eclipse. SWT. SWT. Error (SWT. Java: 2836)

The preceding thread-0 is another enabled thread.

【Analysis]:

In the SWT program,

SWT automatically creates a user interface thread

Non-User Interface threads cannot directly operate on User Interface threads

To try to modify the user interface in another thread, use the following method:

If (! This. display. isdisposed ()){

Runnable = new runnable (){

Public void run (){

// Modify the interface code

}

};

Display. syncexec (runnable); // The key lies in this sentence.

}

Description in SWT-DOC:

public void syncExec(java.lang.Runnable runnable)

Causes run()Method of the runnable to be invoked The user-interface threadAt the next reasonable opportunity. The thread which callthis method is suincluded until the runnable completes.

Parameters:

runnable-Code to run on the user-interface thread.

In addition, it corresponds to another method:

public void asyncExec(java.lang.Runnable runnable)

Causes run()Method of the runnable to be invoked The user-interface threadAt the next reasonable opportunity. The caller of this method continues to run in parallel, and is not notified when the runnable has completed.

Parameters:

runnable-Code to run on the user-interface thread.