参考 - P487

1. vscode配置java的格式

点击左下角齿轮 -> 设置 -> 打开任意的setting.json输入如下代码

{code-runner.executorMap": {"java": "cd $dir && javac -encoding utf-8 $fileName && java $fileNameWithoutExt"},
}

之后再执行就可以了

2. 建议的聊天客户端如下

import java.io.*;
import java.net.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;public class SimpleChatClientA {JTextField outgoing;PrintWriter writer;Socket sock;public void go() {JFrame frame = new JFrame("Ludicrously Simple Chat Client");JPanel mainPanel = new JPanel();outgoing = new JTextField(20);JButton sendButton = new JButton("Send");sendButton.addActionListener(new SendButtonListener());mainPanel.add(outgoing);mainPanel.add(sendButton);frame.getContentPane().add(BorderLayout.CENTER, mainPanel);setUpNetworking();frame.setSize(400, 500);frame.setVisible(true);}private void setUpNetworking(){try {sock = new Socket("127.0.0.1", 5000);writer = new PrintWriter(sock.getOutputStream());System.out.println("networking established");} catch (IOException ex) {ex.printStackTrace();}}public class SendButtonListener implements ActionListener {public void actionPerformed(ActionEvent ev) {try {writer.println(outgoing.getText());writer.flush();} catch (Exception ex) {ex.printStackTrace();}outgoing.setText("");outgoing.requestFocus();}}   // 关闭SendButton Listener内部类public static void main(String[] args) {new SimpleChatClientA().go();}
}   // 关闭外部类