等到工作来，一来就工作

public class MainFrame extends javax.swing.JFrame implements Runnable
{
    private volatile int cnt = 0;
    
    public MainFrame()
    {
        initComponents();
        this.setSize(500, 300);
        new Thread(this).start();
    }
    
    public void run()
    {
        int num=1;
        while(true)
        {
            this.receive();
            this.jTextField.setText(String.valueOf(num++));
        }
    }
    
    private synchronized void send()
    {
        this.cnt ++;
        this.notifyAll();
    }
    
    private synchronized void receive()
    {
        while(this.cnt<=0)
            try{this.wait();}catch(Exception e){}
        
        this.cnt --;
    }
    
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">
    private void initComponents()
    {
        jTextField = new javax.swing.JTextField();
        jButton = new javax.swing.JButton();

        getContentPane().setLayout(null);

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setFont(new java.awt.Font("Arial", 0, 10));
        setForeground(java.awt.Color.white);
        getContentPane().add(jTextField);
        jTextField.setBounds(120, 140, 130, 22);

        jButton.setText("jButton");
        jButton.addActionListener(new java.awt.event.ActionListener()
        {
            public void actionPerformed(java.awt.event.ActionEvent evt)
            {
                jButtonActionPerformed(evt);
            }
        });

        getContentPane().add(jButton);
        jButton.setBounds(290, 140, 76, 28);

        pack();
    }
    // </editor-fold>

    private void jButtonActionPerformed(java.awt.event.ActionEvent evt)
    {
            this.send();
    }
                
    public static void main(String args[])
    {
        java.awt.EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                new MainFrame().setVisible(true);
            }
        });
    }
    
    // Variables declaration - do not modify
    private javax.swing.JButton jButton;
    private javax.swing.JTextField jTextField;
    // End of variables declaration
    
}

ftp://ftp.comp.hkbu.edu.hk/pub/oracle/