我显示了一个摆动框架，带有一个开始线程的按钮：

public class Frame extends JFrame {
    private static Frame frame= null;
    public static Frame getFrame(){
        return frame== null? frame= new Frame(): frame;
    }

    Thread worker;
    JTextArea  textarea = new JTextArea();
    JButton b = new JButton();

    Frame(){
        frameinstance = this;
        b.addActionListener(actionEvent -> {
            worker = new Thread(new myWorker());
            worker.start();
        });
        //...
    }
}

线程看起来像：

public class myWorker implements Runnable {
    public void run(){
        //Do some work
        Frame.getFrame().textArea.append("Some work has been done");
        //Do some work
       Frame.getFrame().textArea.append("Some work has been done");
        //etc...
    }

}

但文本实际上并没有随着工作的进展而出现。