[JAVASE] 异常 与 SE阶段知识点补充

在Java SE阶段，我们主要学习了以下内容：

1. 面向对象的编程（OOP）
2. 异常处理
3. 集合框架
4. 泛型
5. 流式编程
6. 多线程
7. 网络编程
8. 反射
9. 数据库编程（JDBC）
10. 文件IO

以下是对应这些知识点的简单示例代码：

1. 异常处理：

try {
    int data = 100 / 0;
} catch (ArithmeticException e) {
    e.printStackTrace();
} finally {
    // 清理资源
}

2. 集合框架：

List<String> list = new ArrayList<>();
list.add("Hello");
list.add("World");
 
for (String s : list) {
    System.out.println(s);
}

3. 泛型：

List<Integer> numbers = new ArrayList<>();
numbers.add(1);
numbers.add(2);
 
for (Integer number : numbers) {
    System.out.println(number);
}

4. 流式编程：

List<String> list = Arrays.asList("Hello", "World");
list.stream().forEach(System.out::println);

5. 多线程：

Runnable task = () -> System.out.println("Hello from thread: " + Thread.currentThread().getName());
new Thread(task).start();

6. 网络编程（基于Socket的简单通信）：

try (ServerSocket serverSocket = new ServerSocket(8080);
     Socket clientSocket = serverSocket.accept();
     PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
     BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))) {
 
    String inputLine = in.readLine();
    out.println("Hello, " + inputLine);
} catch (IOException e) {
    e.printStackTrace();
}

7. 反射：

try {
    Class<?> clazz = Class.forName("java.lang.String");
    Constructor<?> constructor = clazz.getConstructor(String.class);
    Object instance = constructor.newInstance("Hello");
    Method method = clazz.getMethod("charAt", int.class);
    Object result = method.invoke(instance, 0);
    System.out.println(result);
} catch (Exception e) {
    e.printStackTrace();
}

8. 数据库编程（JDBC）：

try (Connection connection = DriverManager.getConnection(url, username, password);
     Statement statement = connection.createStatement();
     ResultSet resultSet = statement.executeQuery("SELECT * FROM my_table")) {
 
    while (resultSet.next()) {
        System.out.println(resultSet.getString("my_column"));
    }
} catch (SQLException e) {
    e.printStackTrace(