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What is the CopyOnWriteArrayList.get() method in Java?

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The get method gets an element at a specific index of the CopyOnWriteArrayList object.

CopyOnWriteArrayList is a thread-safe version of an ArrayList. For all the write operations like add and set, CopyOnWriteArrayList makes a fresh copy underlying array and performs the operation on the cloned array. Due to this, the performance is lower when compared to ArrayList.

Syntax

public E get(int index)

Parameters

This method takes the integer value that represents the element’s index as an argument.

Return value

The get method returns the element present at the specific index.

This method throws IndexOutOfBoundsException if the index is negative or greater than the size of the list.

index < 0 || index >= size()

Code

The code below demonstrates the use of the get method.

import java.util.concurrent.CopyOnWriteArrayList;
class GetExample {
public static void main( String args[] ) {
// create CopyOnWriteArraySet object which can store integer object
CopyOnWriteArrayList<Integer> list = new CopyOnWriteArrayList<>();
// add elememts
list.add(1);
list.add(2);
list.add(3);
// Print list
System.out.println("The list is: " + list);
// use get method to rettrive element at index 0
System.out.println("\nlist.get(0) : " + list.get(0));
// use get method to rettrive element at index 1
System.out.println("\nlist.get(1) : " + list.get(1));
}
}
Example of the get method

Explanation

In the code above:

  • In line 1: We import the CopyOnWriteArrayList class.

  • In line 5: We create a CopyOnWriteArrayList object with the name list.

  • In lines 8-10: We use the add method to add elements to the list.

  • In line 16: We use the get method with 0 as an argument. We get the element at index 0 as a return value. In our case, the return value is 1.

  • In line 19: We use the get method with 1 as an argument. We get the element at index 1 as a return value. In our case, the return value is 2.

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java
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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