Problem Description:

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

Write a program that reads a letter and displays its corresponding digit.

Please finish the following tasks.

Analysis:

(Describe the problem using your words, including input, output, processing procedure in your own words.)

Design:

(Item the major steps for solving the problem. Draw a flowchart of the program.)

Testing:

(Describe how you test this program using different samples. You must use at least two normal and one wrong sample, and explain the results and reasons.)

Analysis, testing and Design are mandatory Code in java