簡述：

用位元組流的方式，複製Java物件

程式碼：

流克隆複製函式

    public static Object deepClone(Object obj){
        if(obj == null){
            return null;
        }
        try {
            ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
            Object cloneObj = null;
            ObjectOutputStream out = new ObjectOutputStream(byteOut);
            out.writeObject(obj);
            ByteArrayInputStream byteIn = new ByteArrayInputStream(byteOut.toByteArray());
            ObjectInputStream in = new ObjectInputStream(byteIn);
            cloneObj = in.readObject();
            return cloneObj;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
 

ObjectClone.java

package test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class ObjectClone {
    /**
     * 測試物件
     */
    private static class Person implements Serializable {
        private String name;
        private int age;
        Person(String name, int age){
            this.name = name;
            this.age = age;
        }
        @Override
        public String toString() {
            return String.format("name: %s\nage: %s", name, age);
        }
    }
    
    /**
     * 測試函式
     */
    public static void main(String[] args) {
        Person person = new Person("Henry", 22);
        Person newPerson = (Person)ObjectClone.deepClone(person);
        System.out.println(newPerson);
    }
    
    /**
     * 工具類
     * 
     * @param obj
     * @return
     */
    public static Object deepClone(Object obj){
        if(obj == null){
            return null;
        }
        try {
            ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
            Object cloneObj = null;
            ObjectOutputStream out = new ObjectOutputStream(byteOut);
            out.writeObject(obj);
            ByteArrayInputStream byteIn = new ByteArrayInputStream(byteOut.toByteArray());
            ObjectInputStream in = new ObjectInputStream(byteIn);
            cloneObj = in.readObject();
            return cloneObj;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
 

測試結果：

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