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
// Java program to clone an ArrayList to another ArrayList import java.util.ArrayList; public class GFG { public static void main(String a[]) { // create ArrayList ArrayList<String> ArrList1 = new ArrayList<String>(); // Insert elements in ArrayList ArrList1.add( "Mukul" ); ArrList1.add( "Rahul" ); ArrList1.add( "Suraj" ); ArrList1.add( "Mayank" ); // print ArrayList1 System.out.println( "Original ArrayList = " + ArrList1); // clone ArrayList ArrayList ArrList2 = (ArrayList)ArrList1.clone(); // print ArrayList2 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
// Java code to illustrate clone() method import java.io.*; import java.util.*; public class ArrayListDemo { public static void main(String args[]) { // Creating an empty ArrayList ArrayList<Integer> list = new ArrayList<Integer>(); // Use add() method // to add elements in the list list.add( 16 ); list.add( 32 ); list.add( 48 ); // Displaying the list System.out.println( "First ArrayList: " + list); // Creating another linked list and copying // creates a shallow copy ArrayList<Integer> sec_list = (ArrayList<Integer>)list.clone(); sec_list.add( 64 ); // Displaying the list System.out.println( "First ArrayList: " + list); // Displaying the other linked 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)
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