Java CopyOnWriteArrayList clone()用法及代碼示例

CopyOnWriteArrayList的clone()方法返回列表的淺拷貝。淺拷貝在相同索引處包含完全相同的元素。

用法:

public Object clone()

參數：該函數不接受任何參數。

返回值：該函數返回列表的副本。

以下示例程序旨在說明上述函數：

示例1:

// Java Program to illustrate the  
// CopyOnWriteArrayList clone() method in Java 
import java.util.concurrent.CopyOnWriteArrayList; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create object of CopyOnWriteArrayList 
        CopyOnWriteArrayList<Integer> ArrLis 
            = new CopyOnWriteArrayList<Integer>(); 
  
        // Add elements 
        ArrLis.add(32); 
        ArrLis.add(67); 
        ArrLis.add(98); 
        ArrLis.add(100); 
  
        // print CopyOnWriteArrayList 
        System.out.println("CopyOnWriteArrayList: " 
                                           + ArrLis); 
  
        // clone of the arraylist 
        System.out.println("CopyOnWriteArrayList: "
                                    + ArrLis.clone()); 
    } 
}

輸出：

CopyOnWriteArrayList: [32, 67, 98, 100]
CopyOnWriteArrayList: [32, 67, 98, 100]

示例2:

// Java Program to illustrate the  
// CopyOnWriteArrayList clone() method in Java 
  
import java.util.concurrent.CopyOnWriteArrayList; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create object of CopyOnWriteArrayList 
        CopyOnWriteArrayList<String> ArrLis 
            = new CopyOnWriteArrayList<String>(); 
  
        // Add elements 
        ArrLis.add("gopal"); 
        ArrLis.add("gfg"); 
        ArrLis.add("jgec"); 
        ArrLis.add("sudo"); 
  
        // print CopyOnWriteArrayList 
        System.out.println("CopyOnWriteArrayList: " 
                                          + ArrLis); 
  
        // clone of the arraylist 
        System.out.println("CopyOnWriteArrayList: " 
                                  + ArrLis.clone()); 
    } 
}

輸出：

CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]

參考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#clone–

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