The Collections class consists exclusively of static methods that operate on or return collections.
One of them is a copy() method, which needs a source list and a destination list at least as long as the source.
This method copies all elements of the source list to the destination list. After the copy index of the elements in both source and destination lists would be identical.
The destination list must be long enough to hold all copied elements. If it is longer than that, the rest of the destination list's elements would remain unaffected.
package net.javaguides.examples;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Different ways to copy a list into another list
*
* @author Ramesh Fadatare
*
*/
public class CopyListExamples {
public static void main(String[] args) {
List < String > fruits1 = new ArrayList < > ();
// Adding new elements to the ArrayList
fruits1.add("Banana");
fruits1.add("Apple");
fruits1.add("mango");
fruits1.add("orange");
System.out.println(fruits1);
// using the Collections.copy() method
List < String > fruits2 = new ArrayList < > (fruits1.size());
fruits2.add("1");
fruits2.add("2");
fruits2.add("3");
fruits2.add("4");
Collections.copy(fruits2, fruits1);
System.out.println(fruits2);
}
}
Output:
[Banana, Apple, mango, orange]
[Banana, Apple, mango, orange]
Checkout Copy a List to Another List in Java (5 Ways) - 5 different ways to copy a List to another List with an example.
- Using Constructor
- Using addAll() method
- Using Collections.copy() method
- Using Java 8
- Using Java 10
References
Java ArrayList Source Code Examples
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- Java - Copy a List to Another List using Collections.copy() method
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- Java ArrayList removeAll() Method Example
- Java ArrayList remove() Method Example
- How to Iterate over ArrayList in Java
- How to Remove Element from ArrayList in Java
- How to Access Elements of ArrayList in Java
- Create ArrayList from Another ArrayList in Java
- How to Create an ArrayList and Add Elements to It
ArrayList
Collection Framework
Collections
Java
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