知識點1(java有9種傳遞函式引數時是傳值):

8大基礎資料型別加String:

1,位元組 byte  

2,短整型 short 

3,整型int 

4,長整形 long 

5,字元型 char 

6,浮點型 float 

7,雙精度型 double 

8,布林型 boolean

9,String

這8大基礎型別+String是傳值。

知識點2(深度克隆物件的三個方法):

方法1.

import java.util.ArrayList;

/**
 * 1.必須實現Cloneable介面.
 * 2.寫clone方法的話，在clone中程式碼上每一處都要實現深複製.
 * @author jianan
 */
class Work implements Cloneable{
	private String strText;
	private ArrayList<String> array = new ArrayList<String>();
	
	@SuppressWarnings("unchecked")
	@Override
	protected Work clone(){
		Work work;
		try {
			work = (Work)super.clone();
			 work.strText = this.strText;
			 work.array = (ArrayList<String>) (this.array.clone()); //深克隆
			return work;
		} catch (CloneNotSupportedException e) {
			e.printStackTrace();
		}
		return null;
	}
	
	public void addImage(String imgName){
		array.add(imgName);
	}
	
	public void setText(String strText){
		this.strText = strText;
	}
	
	public void display(String str){
		System.out.println(str);
		System.out.println("Text:" + strText);
		for(int i = 0; i < array.size(); i++){
			System.out.println("Image:" + array.get(i));
		}
		
		System.out.println();
	}
}

//測試函式
public class Main {

	public static void main(String[] args) {
		Work work = new Work();
		work.setText("111");
		work.addImage("1.png");
		work.addImage("2.png");
		work.addImage("3.png");
		work.display("111");
		
		Work work2 = work.clone();   
		work2.setText("2");
		work2.addImage("4.png");
		work2.addImage("5.png");
		work2.addImage("6.png");
		work2.display("222");
		
		work.display("111");
	}
}
 

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
/**
 * 1.實現Serializable介面即可.toString方法不用重寫因為該接口裡面本身就為空.
 * @author jianan
 */
//深克隆 工具
class DepthCloneUtil{
	public static Object depthClone(Object srcObj){
		Object cloneObj = null;
		try {
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			ObjectOutputStream oo = new ObjectOutputStream(out);
			oo.writeObject(srcObj);
			ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
			ObjectInputStream oi = new ObjectInputStream(in);
			cloneObj = oi.readObject();
		} catch (IOException e) {
			e.printStackTrace();
		}catch (ClassNotFoundException e) {
			e.printStackTrace();
		}		
		return cloneObj; 
	}
}

//
class Work implements Serializable{
	private static final long serialVersionUID = -3219618174845671783L;  //會自動補充的
	private String strText;
	private ArrayList<String> array = new ArrayList<String>();
	
	public void addImage(String imgName){
		array.add(imgName);
	}
	
	public void setText(String strText){
		this.strText = strText;
	}
	
	public void display(String str){
		System.out.println(str);
		System.out.println("Text:" + strText);
		for(int i = 0; i < array.size(); i++){
			System.out.println("Image:" + array.get(i));
		}
		
		System.out.println();
	}
}

//測試函式
public class Main {

	public static void main(String[] args) {
		Work work = new Work();
		work.setText("111");
		work.addImage("1.png");
		work.addImage("2.png");
		work.addImage("3.png");
		work.display("111");
		
		Work work2 = (Work)DepthCloneUtil.depthClone(work); //如果採用物件序列化的話，
		work2.setText("2");
		work2.addImage("4.png");
		work2.addImage("5.png");
		work2.addImage("6.png");
		work2.display("222");
		
		work.display("111");
	}
}
 

方法3

直接寫一個clone方法。

2種方式都實現了深度克隆,輸出結果都是：

/*
111
Text:111
Image:1.png
Image:2.png
Image:3.png

222
Text:2
Image:1.png
Image:2.png
Image:3.png
Image:4.png
Image:5.png
Image:6.png

111
Text:111
Image:1.png
Image:2.png
Image:3.png
*/