Java.util.ArrayList.clone() Method


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Description

The java.util.ArrayList.clone() returns a shallow copy of this ArrayList instance(i.e the elements themselves are not copied).

Declaration

Following is the declaration for java.util.ArrayList.clone() method

public Object clone()

Parameters

  • NA

Return Value

This method returns a clone of this ArrayList instance.

Exception

  • NA

Example

The following example shows the usage of java.util.Arraylist.clone() method.

package com.tutorialspoint;

import java.util.ArrayList;

public class ArrayListDemo {
   public static void main(String args[]) {

   // create an empty array list
   ArrayList<StringBuilder> arrlist1 = new ArrayList<StringBuilder>();

   // use add for new value
   arrlist1.add(new StringBuilder("Learning-"));

   // using clone to affect the objects pointed to by the references.
   ArrayList arrlist2 = (ArrayList) arrlist1.clone();

   // appending the string
   StringBuilder strbuilder = arrlist1.get(0);
   strbuilder.append("list1, list2-both pointing to the same StringBuilder");

   System.out.println("The 1st list prints: ");

   // both lists will print the same value, printing list1
   for (int i = 0; i < arrlist1.size(); i++) {
   System.out.print(arrlist1.get(i) + " ");
   }

   System.out.println("The 2nd list prints the same i.e:");

   // both lists will print the same value, printing list2
   for (int i = 0; i < arrlist2.size(); i++) {
   System.out.print(arrlist2.get(i));
   }
   }
}

Let us compile and run the above program, this will produce the following result:

The 1st list prints:
Learning-list1, list2 - both pointing to the same StringBuilder
The 2nd list prints the same i.e:
Learning-list1, list2 - both pointing to the same StringBuilder

java_util_arraylist.htm

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