如何在Java中创建对象的深层副本？

import java.io.*;

public class DeepCopyUtil {
    public static <T extends Serializable> T deepCopy(T obj) throws IOException, ClassNotFoundException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(obj);
        oos.flush();

        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bis);
        return (T) ois.readObject();
    }
}

MyObject original = new MyObject();
MyObject copied = DeepCopyUtil.deepCopy(original);

public class MyObject implements Cloneable {
    private int field1;
    private String field2;
    private OtherObject field3;

    public MyObject clone() {
        try {
            MyObject clone = (MyObject) super.clone();
            clone.field3 = this.field3.clone();
            return clone;
        } catch (CloneNotSupportedException e) {
            throw new AssertionError();
        }
    }
}

MyObject original = new MyObject();
MyObject copied = original.clone();

public class MyObject {
    private int field1;
    private String field2;
    private OtherObject field3;

    public MyObject(MyObject original) {
        this.field1 = original.field1;
        this.field2 = original.field2;
        this.field3 = new OtherObject(original.field3);
    }
}

MyObject original = new MyObject();
MyObject copied = new MyObject(original);