JAVA深度和浅度克隆的区别

在JAVA克隆对象不能简单的使用clone方法，clone方法只是进行浅克隆。请看下方：

 

深度克隆类：

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

public class DepthClone {
	
	public  final static Object objectCopy(Object oldObj) {
		Object newObj = null;
		
		try {
			ByteArrayOutputStream bo = new ByteArrayOutputStream();
			ObjectOutputStream oo = new ObjectOutputStream(bo);
			oo.writeObject(oldObj);//源对象
			ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray());
			ObjectInputStream oi= new ObjectInputStream(bi);
			newObj = oi.readObject();//目标对象
		} catch (IOException e) {
			e.printStackTrace();
		}catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		
		return newObj;
	}
}

 

浅度克隆类：

import java.io.Serializable;

public class SimpleClone implements Cloneable ,Serializable {

	private static final long serialVersionUID = -7552721152118950502L;
	
	public    String s = null;
    public Object o = null;
    public CloneObject cloneObject = null;
	
	
	public SimpleClone(CloneObject cloneObject) {
		this.cloneObject = cloneObject;
	}

	public Object clone() {
		SimpleClone newSimpleClone =  null;
		try {
			/* 浅克隆 */
			newSimpleClone = (SimpleClone)super.clone();
		} catch (CloneNotSupportedException e) {
			e.printStackTrace();
		}
		return newSimpleClone;
	}
}

 

 克隆对象：

import java.io.Serializable;

public class CloneObject implements Serializable{
	
	private static final long serialVersionUID = 4332788486669750696L;

	private String name ;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
}

 

克隆测试：

public class TestClone {
	
	public static void main(String[] arg) {
		CloneObject obj1 = new CloneObject();
		obj1.setName("cloneOne");
		CloneObject obj2 = new CloneObject();
		obj2.setName("cloneTwo");
		
		SimpleClone simpleClone1 = new SimpleClone(obj1);
		SimpleClone simpleClone2 = new SimpleClone(obj2);
		
		simpleClone1.s = "simpleClone1";
		simpleClone1.o = "simpleClone1Object";
		
		//simpleClone2 = (SimpleClone)simpleClone1.clone();
		
		simpleClone2 = (SimpleClone)DepthClone.objectCopy(simpleClone1);
		
		/* 如果是浅克隆， simpleClone1中的cloneObject会随着simpleClone2的cloneObject改变面改变*/
		simpleClone2.cloneObject.setName("cloneThree");
		
		System.out.println(simpleClone1.cloneObject.getName());
		System.out.println(simpleClone2.cloneObject.getName());
	}
	
}

 

评论

3 楼 bo_hai 2011-07-26  

非常感谢各位的批评。深度克隆和浅度克隆的区别我只是在程序层面理解，理解的很浅。

2 楼 csdxqzp 2011-07-25  

什么深度和浅度，描述都没描述清楚。

专业词汇应该叫 非顶级对象与顶级对象

1 楼 xiaoliefengfeng 2011-07-25  

深度克隆和浅度克隆 有啥区别了，你没说啊，我不懂