ArrayList get() method in Java
In this article, we will see the get() method of ArrayList class in Java. This method is used to get an ArrayList element by its index.
Introduction
ArrayList is a widely used class to store and retrieve data in a collection framework.
ArrayList is an ordered collection i.e. it maintains the insertion order of the elements. Also, it allows duplicate elements in the list.
When we iterate over an ArrayList using a for loop, the variable i will be the current index of the list. We can use the variable i in the get(int index) method to get the element at index i.
We have seen a few methods of the ArrayList class before like add(), addAll(), remove(), set(), iterate(), clear() and contains().
Today we will see the get() method.
ArrayList get(int index) method
The get() method is used to get the ArrayList element by its index.
The method signature is given below.
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public E get(int index)
As shown in the above method signature, it returns the element E from the ArrayList.
It accepts the single parameter index of type int.
I have given an example Java program to get an ArrayList element by its index using the get() method.
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import java.util.ArrayList;
import java.util.List;
/**
* A Java program to get the element by
* its index using the get() method
*
* @author Gaurav Kukade at coderolls.com
*/
public class ArrayListGetExample {
public static void main(String[] args) {
List<String> list = new ArrayList<String>();
list.add("Monday");
list.add("Tuesday");
list.add("Wednesday");
list.add("Thursday");
list.add("Friday");
list.add("Saturday");
list.add("Sunday");
System.out.println("Arraylist:"+ list);
// get element at index 3
String element = list.get(3);
System.out.println("\nThe element at index 3 is "+ element);
System.out.println("\nUsing the get() method in for loop: \n");
// using the get(0 method in for loop
for(int i=0; i<list.size(); i++) {
System.out.println("The element at index "+i+" is "+ list.get(i));
}
}
}
Output:
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Arraylist:[Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday]
The element at index 3 is Thursday
Using the get() method in for loop:
The element at index 0 is Monday
The element at index 1 is Tuesday
The element at index 2 is Wednesday
The element at index 3 is Thursday
The element at index 4 is Friday
The element at index 5 is Saturday
The element at index 6 is Sunday
Conclusion
We can use the get(int index) method to get an Arraylist element by its index.
The element from an arrayList at index i can be obtained as
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arrayList.get(i);
The example java program used in the above article can be found at this GitHub repository.
Please write your thoughts in the comment section below.
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