Java – Arrays – Basic Programs

Java – Display first element of array

class Code {       public static void main(String[] args)       {                   int[] arr = {4, 2, 8, 9, 1, 6, 7, 4};                   int first = arr[0];                   System.out.println(“First element is : ” + first);       } }

It is recommended to check the array contains elements or not before accessing elements:

class Code {       public static void main(String[] args)       {                   int[] arr = {4, 2, 8, 9, 1, 6, 7, 4};                   if(arr.length==0)                   {                               System.out.println(“Empty array”);                   }                   else                   {                               int first = arr[0];                               System.out.println(“First element is : ” + first);                   }       } }

We can handle ArrayIndexOutOfBoundsException instead of check the length before accessing elements:

class Code {       public static void main(String[] args)       {                   int[] arr = {4, 2, 8, 9, 1, 6, 7, 4};                   try                   {                               int first = arr[0];                               System.out.println(“First element is : ” + first);                   }                   catch(ArrayIndexOutOfBoundsException e)                   {                               System.out.println(“Exception : No index to access elements”);                   }       } }

Java – Display first and last element of array

class Code {       public static void main(String[] args)       {                   int[] arr = {4, 2, 8, 9, 1, 6, 7, 4};                   int n = arr.length;                   int first = arr[0];                   int last = arr[n-1];                   System.out.println(“First element is : ” + first);                   System.out.println(“Last element is : ” + last);       } }

Find the sum of first and last elements in the array

class Code {       public static void main(String[] args)       {                   int[] arr = {4, 2, 8, 9, 1, 6, 7, 5};                   if(arr.length==0)                   {                               System.out.println(“Empty array”);                   }                   else                   {                               int n = arr.length;                               int first = arr[0];                               int last = arr[n-1];                               System.out.println(“Sum of First and Last elements : ” + (first+last));                   }       } }