java - 将 arraylist 添加到 Jlist

Question

我的方法 receiveArrayLists 中有一个数组列表，我想将其添加到 JList 中。我怎样才能做到这一点？

import java.awt.Dimension;
import java.awt.Scrollbar;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class GUI implements Runnable {

private Server server;
private JFrame frame = new JFrame();
private JTextField jtf = new JTextField();
private JList jl = new JList();
private JTextArea jl1 = new JTextArea();
private JScrollPane pane = new JScrollPane(jl);
private Socket socket;
private DataInputStream dis;
private ObjectInputStream ois = null;
private DataOutputStream dos;

public GUI() {

    socket = new Socket();
    InetSocketAddress ipPort = new InetSocketAddress("127.0.0.1", 4444);
    try {
        socket.connect(ipPort);
        dis = new DataInputStream(socket.getInputStream());
        dos = new DataOutputStream(socket.getOutputStream());
    } catch (Exception e) {
    }
    new Thread(this).start();


    frame.getContentPane().setLayout(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(50, 300, 420, 400);
    frame.setResizable(false);
    frame.setVisible(true);
    pane.add(jl);
    pane.add(jl1);
    jl1.setEditable(false);
    jtf.setBounds(50, 40, 150, 40);
    jl.setBounds(50, 90, 150, 200);
    jl1.setBounds(210, 90, 150, 200);


    jtf.addKeyListener(new KeyListener() {

        public void keyTyped(KeyEvent e) {
        }

        public void keyPressed(KeyEvent e) {
        }

        public void keyReleased(KeyEvent e) {
            if (dos != null) {
                if(jtf.getText().length() >0){
                try {
                    dos.writeUTF(jtf.getText());
                } catch (IOException ex) {
                    Logger.getLogger(GUI.class.getName()).log(Level.SEVERE, null, ex);
                }
                }else{
                    jl1.setText("");
                }
            }

        }
    });
    frame.add(jtf);
    frame.add(jl);
    frame.add(jl1);

    frame.add(pane);
}

public void run() {
    String fromServer;
    try {
        while ((fromServer = dis.readUTF()) != null) {
            if (fromServer.equals("read")) {
                receiveArrayList();
            }
        }
    } catch (Exception e) {

    }
}

这是我的方法，如您所见，我尝试使用追加，这显然无法将数组列表添加到 JList

public void receiveArrayList() {

    try {
        jl1.setText("");
        ois = new ObjectInputStream(socket.getInputStream());
        @SuppressWarnings("unchecked")
        ArrayList<String> a = (ArrayList<String>) (ois.readObject());
        for (int i = 0; i < a.size(); i++) {
            jl.append(a.get(i) + " \n");
        }
        dis = new DataInputStream(socket.getInputStream());
    } catch (ClassNotFoundException ex) {
        System.out.println(ex);
    } catch (IOException ex) {
        System.out.println(ex);
    }
}

public static void main(String[] args) {
    GUI g = new GUI();

}
}

Answer 1

最简单的是创建一个 DefaultListModel 对象，在 for 或 foreach 循环中迭代 ArrayList，并通过其 addElement(...) 方法将项目添加到模型中。然后将 JList 的模型设置为您的模型。

更复杂但令人满意的是通过使用 ArrayList 作为模型的核心扩展 AbstractListModel 来创建您自己的 ListModel。