我正在为我的计算机编程课程创建一个最终项目，并遇到了一个奇怪的问题，我希望有人可以帮助我。我正在尝试制作一个将在两台计算机之间运行的二十一点程序，但是我无法将标签的文本更改为超出它们最初设置的范围。为了完成这个项目，我使用了eclipse编译器和窗口生成器插件。
问题本身位于标签“lblEnterTextHere”中，当我尝试在rungame方法中执行此操作时，其文本不会更改。随机的System.out.print消息是检查代码是否甚至到达运行此方法的点，并且确实如此。打印“等待连接”。
注意：我是java的新手，这只是一门12年级的课程，所以请清楚地解释你的答案。这会有很大帮助。此外，这甚至都不是游戏，只是我正在尝试做的骨架。
我的代码：
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.ImageIcon;
import java.io.*;
import java.net.*;
public class Window {
ServerSocket providerSocket;
Socket connection = null;
ObjectOutputStream out;
ObjectInputStream in;
private JFrame frame;
JLabel label_5;
JButton btnNewButton;
JLabel label;
JLabel label_1;
JLabel label_2;
JLabel label_3;
JLabel label_4;
JLabel label_6;
JLabel label_7;
JLabel label_8;
JLabel label_9;
JLabel lblPlayerOneyou;
JLabel lblPlayerother;
JLabel lblNewLabel;
JLabel lblScore;
JLabel lblNewLabel_1;
JLabel lblNewLabel_2;
JButton btnNewButton_1;
JLabel lblStatus;
JLabel lblEnterTextHere;
public static void main(String[] args) {
Window window = new Window();
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Window window2 = new Window();
window2.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
System.out.print("Hello.");
window.runGame();
}
public Window() {
frame = new JFrame();
frame.setBounds(100, 100, 792, 536);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
label_5 = new JLabel("New label");
label_5.setEnabled(false);
label_5.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_5.setBounds(36, 74, 110, 145);
frame.getContentPane().add(label_5);
btnNewButton = new JButton("First Draw");
btnNewButton.setEnabled(false);
btnNewButton.setBounds(661, 125, 89, 94);
frame.getContentPane().add(btnNewButton);
label = new JLabel("New label");
label.setEnabled(false);
label.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label.setBounds(156, 74, 110, 145);
frame.getContentPane().add(label);
label_1 = new JLabel("New label");
label_1.setEnabled(false);
label_1.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_1.setBounds(276, 74, 110, 145);
frame.getContentPane().add(label_1);
label_2 = new JLabel("New label");
label_2.setEnabled(false);
label_2.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_2.setBounds(393, 74, 110, 145);
frame.getContentPane().add(label_2);
label_3 = new JLabel("New label");
label_3.setEnabled(false);
label_3.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_3.setBounds(516, 74, 110, 145);
frame.getContentPane().add(label_3);
label_4 = new JLabel("New label");
label_4.setEnabled(false);
label_4.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_4.setBounds(36, 267, 110, 145);
frame.getContentPane().add(label_4);
label_6 = new JLabel("New label");
label_6.setEnabled(false);
label_6.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_6.setBounds(156, 267, 110, 145);
frame.getContentPane().add(label_6);
label_7 = new JLabel("New label");
label_7.setEnabled(false);
label_7.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_7.setBounds(270, 267, 110, 145);
frame.getContentPane().add(label_7);
label_8 = new JLabel("New label");
label_8.setEnabled(false);
label_8.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_8.setBounds(393, 267, 110, 145);
frame.getContentPane().add(label_8);
label_9 = new JLabel("New label");
label_9.setEnabled(false);
label_9.setIcon(new ImageIcon("C:\\Users\\Alexander Wong\\Documents\\Cards\\cardBack.jpg"));
label_9.setBounds(516, 267, 110, 145);
frame.getContentPane().add(label_9);
lblPlayerOneyou = new JLabel("Player one (You)");
lblPlayerOneyou.setBounds(46, 26, 100, 24);
frame.getContentPane().add(lblPlayerOneyou);
lblPlayerother = new JLabel("Player 2 (Other player)");
lblPlayerother.setBounds(49, 241, 123, 14);
frame.getContentPane().add(lblPlayerother);
lblNewLabel = new JLabel("Score:");
lblNewLabel.setBounds(170, 31, 46, 14);
frame.getContentPane().add(lblNewLabel);
lblScore = new JLabel("Score:");
lblScore.setBounds(170, 242, 46, 14);
frame.getContentPane().add(lblScore);
lblNewLabel_1 = new JLabel("0");
lblNewLabel_1.setBounds(220, 31, 46, 14);
frame.getContentPane().add(lblNewLabel_1);
lblNewLabel_2 = new JLabel("??");
lblNewLabel_2.setBounds(220, 241, 46, 14);
frame.getContentPane().add(lblNewLabel_2);
btnNewButton_1 = new JButton("Quit");
btnNewButton_1.setEnabled(false);
btnNewButton_1.setBounds(661, 261, 89, 87);
frame.getContentPane().add(btnNewButton_1);
lblStatus = new JLabel("Status:");
lblStatus.setBounds(23, 458, 46, 14);
frame.getContentPane().add(lblStatus);
lblEnterTextHere = new JLabel("Enter text here");
lblEnterTextHere.setBounds(63, 458, 109, 14);
frame.getContentPane().add(lblEnterTextHere);
}
public void runGame() {
try {
System.out.println("Hello.");
providerSocket = new ServerSocket(5131, 10);
lblEnterTextHere.setText("Waiting for connection");
System.out.println("Waiting for connection");
lblStatus.setText("me");
connection = providerSocket.accept();
lblEnterTextHere.setText("Connection received from " + connection.getInetAddress().getHostName());
out = new ObjectOutputStream(connection.getOutputStream());
out.flush();
in = new ObjectInputStream(connection.getInputStream());
out.writeInt(-1);
out.flush();
System.out.println("All systems go.");
try {
in.close();
out.close();
providerSocket.close();
} catch (IOException ioException) {
ioException.printStackTrace();
}
} catch (IOException ioException){
ioException.printStackTrace();
}
}
}
答案 0 :(得分：3)
您通过在该线程中放置EDT功能来阻止ServerSocket。将runGame中的功能放在SwingWorker中，用户界面可以免费更新其组件。
由于您不需要任何退货信息，您可以使用SwingWorker<Void, Void>
请参阅此related post。