1. Compile and run below program.

2. Make sure to click on the Output Window.

3. Test the program by entering different characters. Take notes of below program and your observations and include in your comments:

• Note toUpperCase()method converting the input to upper case letters.

• Note if the user input more than one letter, note what charAt(0)do.

1. Submit your work.

   The international standard letter/number mapping found on the telephone is shown below:

1	2 ABC	3 DEF
4 GHI	5 JKL	6 MNO
7 PQRS	8 TUV	9 WXYZ
	0

I need notes at the end of the lines of code in Java. For example : import java.util.Scanner; //importing Java Scanner library

// Program # 1

import java.util.Scanner;

public class Program1 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

System.out.print("Enter a letter: ");

char ch = input.nextLine().charAt(0);

int number = 0;

switch (Character.toUpperCase(ch))

{

case 'A':

case 'B':

case 'C': number = 2; break;

case 'D':

case 'E':

case 'F': number = 3; break;

case 'G':

case 'H':

case 'I': number = 4; break;

case 'J':

case 'K':

case 'L': number = 5; break;

case 'M':

case 'N':

case 'O': number = 6; break;

case 'P':

case 'Q':

case 'R':

case 'S': number = 7; break;

case 'T':

case 'U':

case 'V': number = 8; break;

case 'W':

case 'X':

case 'Y':

case 'Z': number = 9; break;

default: System.out.println(ch + "is an invalid input ");

System.exit(1);

}

System.out.println("The corresponding number is " + number);

}

}