CopyOnWriteArrayList clone() method in Java

Last Updated : 26 Nov, 2018

The clone() method of CopyOnWriteArrayList returns a shallow copy of the list. The shallow copy contains exactly the same elements at the same index.

Syntax:

public Object clone()

Parameters: The function does not accept any parameters.

Return Value: The function returns a clone of the list.

Below programs illustrate the above function:

Program 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()); 
    } 
} 

Output:

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

Program 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()); 
    } 
} 

Output:

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

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

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