我正在嘗試編寫一個(gè)代碼JButton，當(dāng)我單擊它時(shí)，文本將從“連接”更改為“斷開(kāi)連接”，但是 Eclipse 給我一個(gè)錯(cuò)誤，提示“無(wú)法解析連接”。我也嘗試過(guò)將其放在 try catch 循環(huán)之外。btnConnect = new JButton("Connect");btnConnect.addMouseListener(new MouseAdapter() {    public void mouseClicked(MouseEvent arg0) {        try {            Connect.setText("Disconnect");            int portNum = 5520;            String hostAddress = Actual_IP_Address.getText();            sock = new Socket(hostAddress, portNum);            writeSock = new PrintWriter ( sock.getOutputStream(), true);            readSock = new BufferedReader (new InputStreamReader(sock.getInputStream()));        }        catch(Exception ex) {            System.out.println("Error: " + ex);            sock = null;        }    }});任何指示將不勝感激。