How to clone an ArrayList to another ArrayList in Java?
The clone() method of the ArrayList class is used to clone an ArrayList to another ArrayList in Java as it returns a shallow copy of its caller ArrayList.
Syntax:
public Object clone();
Return Value: This function returns a copy of the instance of Object.
Below program illustrate the Java.util.ArrayList.clone() method:
Example:
Java
import java.util.ArrayList;
public class GFG {
public static void main(String a[])
{
ArrayList<String> ArrList1
= new ArrayList<String>();
ArrList1.add( "Mukul" );
ArrList1.add( "Rahul" );
ArrList1.add( "Suraj" );
ArrList1.add( "Mayank" );
System.out.println( "Original ArrayList = "
+ ArrList1);
ArrayList ArrList2
= (ArrayList)ArrList1.clone();
System.out.println( "Clone ArrayList2 = "
+ ArrList2);
}
}
|
Output
Original ArrayList = [Mukul, Rahul, Suraj, Mayank]
Clone ArrayList2 = [Mukul, Rahul, Suraj, Mayank]
Time complexity: O(N) where N is the size of ArrayList
Auxiliary Space: O(N)
Example 2:
Java
import java.io.*;
import java.util.*;
public class ArrayListDemo {
public static void main(String args[])
{
ArrayList<Integer> list = new ArrayList<Integer>();
list.add( 16 );
list.add( 32 );
list.add( 48 );
System.out.println( "First ArrayList: " + list);
ArrayList<Integer> sec_list
= (ArrayList<Integer>)list.clone();
sec_list.add( 64 );
System.out.println( "First ArrayList: " + list);
System.out.println( "Second ArrayList is: "
+ sec_list);
}
}
|
Output
First ArrayList: [16, 32, 48]
First ArrayList: [16, 32, 48]
Second ArrayList is: [16, 32, 48, 64]
Time complexity: O(N) where N is the size of ArrayList
Auxiliary Space: O(N)
Last Updated :
19 Jul, 2022
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