Question

Write a program in Java with arrays.

Answer 1

Explanation:

ArrayIndexOutOfBoundsException

//Java Program to demonstrate the case of.

//ArrayIndexOutOfBoundsException in a Java Array.

public class TestArrayException{

public static void main(String args[]){

int arr[]={50,60,70,80};

for(int i=0;i<=arr.length;i++){

System.out.println(arr[i]);

}

Answer 2

Algorithm:

• Accepting the elements of the Matrix using Scanner.
• Displaying the Matrix before processing it.
• Reversing each element of the Matrix by iterating over each element and reversing it by using the reverse method.
• Displaying the Matrix after processing it.

   

Program:

   public class ReverseNumbersInArray {

       static int[ ][ ] matrix = new int[3][4];

       static void displayMatrix(String title) {

           System.out.println(title);

           for (int[ ] rows : matrix)

               System.out.println(Arrays.toString(rows));

       }

       static int reverse(int number) {

           return Integer.parseInt(new StringBuilder(number + "").reverse( ).toString( ));

       }

       public static void main(String[ ] args) {

           Scanner sc = new Scanner(System.in);

           System.out.println("Enter elements of the Matrix (3 × 4) - ");

           for (int[ ] rows : matrix)

               for (int i = 0; i < rows.length; i++)

                   rows[i] = sc.nextInt( );

           displayMatrix("\nMatrix Before - ");

           for (int[ ] rows : matrix)

               for (int i = 0; i < rows.length; i++)

                  rows[i] = reverse(rows[i]);

           displayMatrix("\nMatrix After - ");

       }

   }