java深拷贝代码实现

Java中实现深拷贝的方法有很多种，这里介绍其中两种较常用的方式： 1. 通过实现Serializable接口实现对象的深拷贝 参考代码如下： ``` import java.io.*; public class DeepCopy implements Serializable { private static final long serialVersionUID = 1L; private String name; private Age age; public DeepCopy(String name, int year, int value) { this.name = name; this.age = new Age(year, value); } public DeepCopy deepCopy() throws IOException, ClassNotFoundException, OptionalDataException { // 将对象写入流中 ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(this); // 从流中读出对象 ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray()); ObjectInputStream ois = new ObjectInputStream(bis); return (DeepCopy) ois.readObject(); } @Override public String toString() { return "DeepCopy{" + "name='" + name + '\'' + ", age=" + age + '}'; } public static void main(String[] args) throws ClassNotFoundException, IOException { DeepCopy deepCopy = new DeepCopy("Tom", 1990, 30); DeepCopy deepCopy1 = deepCopy.deepCopy(); System.out.println(deepCopy); System.out.println(deepCopy1); System.out.println(deepCopy.age == deepCopy1.age); // false，说明深拷贝成功 } private static class Age implements Serializable { private static final long serialVersionUID = 2L; private int year; private int value; public Age(int year, int value) { this.year = year; this.value = value; } @Override public String toString() { return "Age{" + "year=" + year + ", value=" + value + '}'; } } } ``` 2. 通过clone()方法实现对象的深拷贝 参考代码如下： ``` public class DeepCopy implements Cloneable { private String name; private Age age; public DeepCopy(String name, int year, int value) { this.name = name; this.age = new Age(year, value); } @Override public DeepCopy clone() throws CloneNotSupportedException { DeepCopy deepCopy = (DeepCopy) super.clone(); deepCopy.age = age.clone(); return deepCopy; } @Override public String toString() { return "DeepCopy{" + "name='" + name + '\'' + ", age=" + age + '}'; } public static void main(String[] args) throws CloneNotSupportedException { DeepCopy deepCopy = new DeepCopy("Tom", 1990, 30); DeepCopy deepCopy1 = deepCopy.clone(); System.out.println(deepCopy); System.out.println(deepCopy1); System.out.println(deepCopy.age == deepCopy1.age); // false，说明深拷贝成功 } private static class Age implements Cloneable { private int year; private int value; public Age(int year, int value) { this.year = year; this.value = value; } @Override public Age clone() throws CloneNotSupportedException { return (Age) super.clone(); } @Override public String toString() { return "Age{" + "year=" + year + ", value=" + value + '}'; } } } ``` --相关问题--: