一个奇怪的setText问题
我在一个外部类中有一个JLabel对象，想在内部类中修改其text属性，可是在内部类中得到的这个JLabel对象却处于invalid状态，请高手指点迷津！
代码如下：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;
public class Repair {
private JLabel l_state = new JLabel();
private JTextField tf_ip;
private JTextField textField;
private JTextField tf_echoNum;
private JTextField tf_bytes;
private JFrame frame;
private static String testHost = "202.204.48.66 ";
private static int sendBytes = 1;
private static int echoNum = 1;
private static int repairFrequency = 5000;
private static Repair m_instance = null;
private static Timer timer = new Timer();
private static TimerTask task = new RepairTask();
/**
* Launch the application
*
* @param args
*/
public static void main(String args[]) {
try {
Repair window = new Repair();
window.frame.setVisible(true);
timer.scheduleAtFixedRate(task, 0, Repair.getInstance()
.getRepairFrequency());
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Create the application
*/
private Repair() {
initialize();
}
public static Repair getInstance() {
if (m_instance == null) {
synchronized (Repair.class) {
if (m_instance == null) {
m_instance = new Repair();
}
}
}
return m_instance;
}
/**
* Initialize the contents of the frame
*/
private void initialize() {
frame = new JFrame();
frame.setResizable(false);
frame.setIconImage(new ImageIcon( "tips.gif ").getImage());
frame.setTitle( "J.L网络修复器 ");
frame.setSize(308, 207);
frame.setLocation((int) (Toolkit.getDefaultToolkit().getScreenSize()
.getWidth() / 2 - frame.getWidth() / 2), (int) (Toolkit
.getDefaultToolkit().getScreenSize().getHeight() / 2 - frame
.getHeight() / 2));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JPanel panel = new JPanel();
panel.setBorder(new TitledBorder(null, "网络设置 ",
TitledBorder.DEFAULT_JUSTIFICATION,
TitledBorder.DEFAULT_POSITION, null, null));
final GridLayout gridLayout = new GridLayout(0, 2);
gridLayout.setVgap(2);
panel.setLayout(gridLayout);
frame.getContentPane().add(panel, BorderLayout.CENTER);
final JLabel label = new JLabel();
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setText( "发送字节数： ");
panel.add(label);
tf_bytes = new JTextField();
tf_bytes.setText( "1 ");
panel.add(tf_bytes);
final JLabel label_1 = new JLabel();
label_1.setHorizontalAlignment(SwingConstants.CENTER);
label_1.setText( "回应包数量： ");
panel.add(label_1);
tf_echoNum = new JTextField();
tf_echoNum.setText( "1 ");
panel.add(tf_echoNum);
final JLabel label_3 = new JLabel();
label_3.setHorizontalAlignment(SwingConstants.CENTER);
label_3.setText( "修复频率(秒)： ");
panel.add(label_3);
textField = new JTextField();
textField.setText( "5 ");
panel.add(textField);
final JLabel label_2 = new JLabel();
label_2.setHorizontalAlignment(SwingConstants.CENTER);
label_2.setText( "校园网地址： ");
panel.add(label_2);
tf_ip = new JTextField();
tf_ip.setText( "202.204.48.66 ");
panel.add(tf_ip);
final JPanel panel_1 = new JPanel();
frame.getContentPane().add(panel_1, BorderLayout.SOUTH);
final JButton bt_ok = new JButton();
bt_ok.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
bt_ok.setText( "确定 ");
panel_1.add(bt_ok);
final JButton bt_cancel = new JButton();
bt_cancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println(l_state);
l_state.setText( "f ");
}
});
bt_cancel.setText( "取消 ");
panel_1.add(bt_cancel);
l_state.setBorder(new LineBorder(new Color(0, 128, 255), 1, true));
l_state.setHorizontalAlignment(SwingConstants.CENTER);
l_state.setText( "网络状态... ");
frame.getContentPane().add(l_state, BorderLayout.NORTH);
}
public String getTestHost() {
return testHost;
}
public void setTestHost(String testHost) {
Repair.testHost = testHost;
}
public int getEchoNum() {
return echoNum;
}
public void setEchoNum(int echoNum) {
Repair.echoNum = echoNum;
}
public int getRepairFrequency() {
return repairFrequency;
}
public void setRepairFrequency(int repairFrequency) {
Repair.repairFrequency = repairFrequency;
}
public int getSendBytes() {
return sendBytes;
}
public void setSendBytes(int sendBytes) {
Repair.sendBytes = sendBytes;
}
public JLabel getL_state() {
return l_state;
}
public static class RepairTask extends TimerTask {
String line = null;
StringBuffer pingCmd = new StringBuffer();
String[] repairCmds = { "arp -d * ", "nbtstat -R ", "ipconfig /flushdns ",
"nbtstat -RR ", "ipconfig /registerdns " };
@Override
public void run() {
// TODO Auto-generated method stub
try {
pingCmd.delete(0, pingCmd.length());
pingCmd.append( "ping ");
pingCmd.append(Repair.getInstance().getTestHost());
pingCmd.append( " -n " + Repair.getInstance().getEchoNum());
pingCmd.append( " -l " + Repair.getInstance().getSendBytes());
Process process = Runtime.getRuntime().exec(pingCmd.toString());
BufferedReader in = new BufferedReader(new InputStreamReader(
process.getInputStream()));
line = in.readLine();
while (line != null) {
if (line.startsWith( "Request ")) {
Repair.getInstance().getL_state().setText(
"网络故障，正尝试修复... ");
System.out.println( "网络故障，正尝试修复... ");
for (int i = 0; i < repairCmds.length; i++) {
Runtime.getRuntime().exec(repairCmds[i]);
}
Repair.getInstance().getL_state().setText( "修复完毕！ ");
System.out.println( "修复完毕！ ");
break;
} else {
System.out.println(Repair.getInstance().getL_state());
Repair.getInstance().getL_state().setText( "网络正常！ ");
Repair.getInstance().getL_state().repaint();
//System.out.println( "网络正常！ ");
}
line = in.readLine();
}
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println( "IO错误！ ");
}
}
}
}
[解决办法]
这么长竟然没有一个注释，lz你太强了，佩服，发出来问的，最起码得说下在哪报错的吧？？难道要别人帮你调试一下？？
