Find first and last element of ArrayList in java

Given an ArrayList, the task is to get the first and last element of the ArrayList in Java,

Examples:

Input: ArrayList = [1, 2, 3, 4] 
Output: First = 1, Last = 4

Input: ArrayList = [12, 23, 34, 45, 57, 67, 89] 
Output: First = 12, Last = 89

Approach:

Get the ArrayList with elements.
Get the first element of ArrayList with use of get(index) method by passing index = 0.
Get the last element of ArrayList with use of get(index) method by passing index = size – 1.

Below is the implementation of the above approach:

// Java code to find first and last element 
// of ArrayList 
  
import java.util.ArrayList; 
  
public class GFG { 
  
    // main method 
    public static void main(String[] args) 
    { 
  
        // creating an Empty Integer ArrayList 
        ArrayList<Integer> list = new ArrayList<Integer>(5); 
  
        // using add() to initialize values 
        list.add(1); 
        list.add(2); 
        list.add(3); 
        list.add(4); 
  
        // printing initial value ArrayList 
        System.out.print("ArrayList: " + list); 
  
        // find first element 
        int first = list.get(0); 
  
        // find last element 
        int last = list.get(list.size() - 1); 
  
        // print first and last element of ArrayList 
        System.out.println("\nFirst : " + first 
                           + ", Last : " + last); 
    } 
} 

Output:

ArrayList: [1, 2, 3, 4]
First : 1, Last : 4

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