How do you create an ArrayList equal to an ArrayList?

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 ArrList1

= new ArrayList[];

// 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]

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 list = new ArrayList[];

// 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 sec_list

= [ArrayList]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]




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Copy Elements of One ArrayList to Another ArrayList with Java Collections Class

Java 8Object Oriented ProgrammingProgramming

In order to copy elements of ArrayList to another ArrayList, we use the Collections.copy[] method. It is used to copy all elements of a collection into another.

Declaration −The java.util.Collections.copy[] method is declared as follows −

public static void copy[List

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