import java.io.*;
class Student implements Serializable {
    private String name;
    private int age;
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }
    // Getters and setters here...
    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}
public class DeepCopyExample {
    public static void main(String[] args) {
        Student original = new Student("John", 20);
        // 深拷貝
        Student copy = deepCopy(original);
        // 改變原始對象的屬性值
        original.setName("Tom");
        original.setAge(25);
        System.out.println("Original: " + original);  // 輸出 Original: Student{name='Tom', age=25}
        System.out.println("Copy: " + copy);          // 輸出 Copy: Student{name='John', age=20}
    }
    public static <T extends Serializable> T deepCopy(T object) {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(baos);
            oos.writeObject(object);
            oos.close();
            ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
            ObjectInputStream ois = new ObjectInputStream(bais);
            T copy = (T) ois.readObject();
            ois.close();
            return copy;
        } catch (Exception e) {
            throw new RuntimeException("Deep copy failed", e);
        }
    }
}

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
public class ZeroCopyMemoryMappedFileExample {
    public static void main(String[] args) throws IOException {
        File file = new File("data.txt");
        String content = "This is the content to be written.";
        // 寫入數(shù)據(jù)
        try (FileChannel channel = new RandomAccessFile(file, "rw").getChannel()) {
            MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, content.length());
            buffer.put(content.getBytes());
        }
        // 讀取數(shù)據(jù)
        try (FileChannel channel = new FileInputStream(file).getChannel()) {
            MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
            byte[] data = new byte[(int) channel.size()];
            buffer.get(data);
            System.out.println(new String(data));
        }
    }
}