java - JFrame，错误无法对非静态字段进行静态引用

Question

我正在尝试通过 SerialRead 方法设置数据变量，但我得到“无法对非静态字段 Etiqueta2 进行静态引用”，Eclipse 说我应该将 Etiqueta2 设为静态，但它没有在 Jlabel 中显示数据。

public class Final extends JFrame
{

    //Crea Elementos de la interfaz
    JLabel Etiqueta=new JLabel();
    JTextField Texto=new JTextField();
    JButton Boton=new JButton();
    JLabel Etiqueta1=new JLabel();
    JLabel Etiqueta2=new JLabel();
    JButton Boton1=new JButton();




    public Final()
    {
        super();
        // Crea la interfaz

        setVisible(true);
        setLayout(null);
        setTitle("Lectura y escritura de datos");
        setSize(380,200);
        //Propiedades de los elementos del Frame
        // Etiqueta
        Etiqueta.setBounds(20,50, 100, 20);
        Etiqueta.setText("Enviar un digito");
        add(Etiqueta);
        // Caja de texto
        Texto.setBounds(120,50,100, 20);
        add(Texto);
        // Boton
        Boton.setBounds(250,50,100, 20);
        Boton.setText("Enviar");
        add(Boton);
        // Etiqueta 1
        Etiqueta1.setBounds(20,80, 100, 20);
        Etiqueta1.setText("Leer un digito");
        add(Etiqueta1);
        // Etiqueta2
        Etiqueta2.setBounds(120,80,100, 20);
        add(Etiqueta2);
        // Boton 1
        Boton1.setBounds(250,80,100, 20);
        Boton1.setText("Leer");
        add(Boton1);
        // Boton de cierre   
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    void connect ( String portName ) throws Exception
    {
        CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
        if ( portIdentifier.isCurrentlyOwned() )
        {
            System.out.println("Error: Port is currently in use");
        }
        else
        {
            CommPort commPort = portIdentifier.open(this.getClass().getName(),2000);

            if ( commPort instanceof SerialPort )
            {
                SerialPort serialPort = (SerialPort) commPort;
                serialPort.setSerialPortParams(9600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);

                InputStream in = serialPort.getInputStream();
                OutputStream out = serialPort.getOutputStream();

                new SerialReader(in, Etiqueta2).execute();
                (new Thread(new SerialWriter(out))).start();

            }
            else
            {
                System.out.println("Error: Only serial ports are handled by this example.");
            }
        }     
    }

    /** */
public static class SerialReader extends SwingWorker<Void, String> {   //Final frame = new Final();

    private InputStream in;
    private JLabel label;

    public SerialReader(InputStream in, JLabel label) {
        this.in = in;
        this.label = label;
    }

    @Override
    protected void process(List<String> chunks) {
        String data = chunks.get(chunks.size() - 1);
        label.setText(data);
    }

    @Override
    protected Void doInBackground() throws Exception {
        byte[] buffer = new byte[1024];
        int len = -1;
        while ((len = this.in.read(buffer)) > -1) {
            String data = new String(buffer, 0, len);
            System.out.println(data);
            publish(data);
        }
        return null;
    }
}

    /** */
    public static class SerialWriter implements Runnable 
    {
          **** output code ****
    }

    public static void main ( String[] args )
    {

        try
        {
            (new Final()).connect("COM7");
        }
        catch ( Exception e )
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

如何设置 Etiqueta2 标签上的文本以显示数据变量？

谢谢

EDIT3:我用 swingworker 更新了代码，执行和 println 以在控制台中查看数据

Answer 1

SerialReader 是 Final 的静态内部类，因此无法访问 Final 中的任何非静态字段。由于您显然不在 Final 之外使用 SerialReader ，只需将其设为非静态(甚至可以是私有(private)内部类)。这同样适用于 SerialWriter。