Я хотел, чтобы пользователь мог выбрать несколько значений / элементов в JList.
Я попробовал это, и это не сработало. Он не позволяет выбирать несколько значений в JList.
public class ChatClient {
DefaultListModel listModel = new DefaultListModel();
JList onlineList = new JList(listModel);
public ChatClient() {
onlineList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
}
Полный код ChatClient. java:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Arrays;
import java.util.HashSet;
import javax.swing.DefaultListModel;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
public class ChatClient {
BufferedReader in;
PrintWriter out;
JFrame frame = new JFrame("Chatter");
JTextField textField = new JTextField(40);
JTextArea messageArea = new JTextArea(8, 40);
JCheckBox checkBox = new JCheckBox("Broadcast");
DefaultListModel listModel = new DefaultListModel();
JList onlineList = new JList(listModel);
public ChatClient() {
onlineList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
textField.setEditable(false);
messageArea.setEditable(false);
frame.getContentPane().add(textField, "North");
frame.getContentPane().add(checkBox,BorderLayout.WEST);
frame.getContentPane().add(new JScrollPane(messageArea), "South");
frame.getContentPane().add(new JScrollPane(onlineList), "Center");
frame.pack();
onlineList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
checkBox.setSelected(true);
textField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (checkBox.isSelected()) {
out.println(textField.getText());
textField.setText("");
}
else {
System.out.println(Arrays.asList(onlineList.getSelectedIndices())); //For testing
String selectedName = (String) onlineList.getSelectedValue();
out.println(selectedName + ">>"+ textField.getText());
textField.setText("");
}
}
});
}
private String getServerAddress() {
return JOptionPane.showInputDialog(
frame,
"Enter IP Address of the Server:",
"Welcome to the Chatter",
JOptionPane.QUESTION_MESSAGE);
}
private String getName() {
return JOptionPane.showInputDialog(
frame,
"Choose a screen name:",
"Screen name selection",
JOptionPane.PLAIN_MESSAGE);
}
private void run() throws IOException {
String serverAddress = getServerAddress();
Socket socket = new Socket(serverAddress, 9001);
in = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(), true);
while (true) {
String line = in.readLine();
if (line.startsWith("SUBMITNAME")) {
out.println(getName());
} else if (line.startsWith("NAMEACCEPTED")) {
textField.setEditable(true);
} else if (line.startsWith("MESSAGE")) {
messageArea.append(line.substring(8) + "\n");
} else if (line.startsWith("NEWUSER")) {
listModel.addElement(line.substring(7));
} else if (line.startsWith("USEROUT")) {
listModel.removeElement(line.substring(7));
}
}
}
public static void main(String[] args) throws Exception {
ChatClient client = new ChatClient();
client.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
client.frame.setVisible(true);
client.run();
}
}