How can I execute Inner Swingworker classes?

Question

I want execute ExampleSwingWorker1 from Main GUI. Main GUI class compile and doing some jFrame and DB operations and show main app screen to user. And I have another class for store all of my Swingworkers.

public class WorkerClass {
  public class ExampleSwingWorker1 extends SwingWorker<Void, Void> {      
        protected Void doInBackground() throws Exception {
            process1();
            process2();
            process3();
            process4();
            process5();
            process6();
            return null;
        }
        public void done() {
           Toolkit.getDefaultToolkit().beep();
        }
    }

}

Button Action in MainGui Class;

private void buttonRefreshActionPerformed(java.awt.event.ActionEvent evt) {                                              

  WorkerClass.ExampleSwingWorker1 trying = new WorkerClass.ExampleSwingWorker1();   
} 

I tried with the above methods for instantiating ExampleSwingWorker1 but it's not possible. But this Oracle Link offer this method for reach inner class.

Answer 1

You need an instance of WorkerClass first

Workerclass worker = new WorkerClass();
WorkerClass.ExampleSwingWorker1 trying = worker.new ExampleSwingWorker1();
trying.execute();

Read more: Inner classes|Nested classes

Note: If it doesn't use WorkerClass instance method's think it to make it static then you don't need an instance of WorkerClass to create a ExampleSwingWorker1 instance.

Note2: It's recommended that you add @Override annotation. Reasons? Read here