Question

4. Write a Java program to test if the first and the last element of an array list of integers are same
5. Write a Java program to test if the first and the last element of two array list of integers are same

Answer 1

// Java code to find first and last element 
// of ArrayList 

import java.util.ArrayList; 

public class Main{ 

        // 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.println("ArrayList1: " + list); 

                // find first element 
                int first = list.get(0); 

                // find last element 
                int last = list.get(list.size() - 1); 


                if(first==last)
                    System.out.println("first element and last element are equal");
                else
                    System.out.println("first element and last element are not equal");
                ArrayList<Integer> list1 = new ArrayList<Integer>(5); 

                // using add() to initialize values 
                list1.add(1); 
                list1.add(2); 
                list1.add(3); 
                list1.add(4); 
                
                System.out.println("ArrayList2: " + list); 

                // find first element 
                int first1 = list.get(0); 

                // find last element 
                int last1 = list.get(list.size() - 1); 

                // print first and last element of ArrayList 
                if(first==last && first1==last1)
                    System.out.println("first element and last element are equal in both lists");
                else
                    System.out.println("first element and last element are not equal in both lists");
                
                
        } 
} 

Output: