Hi Friend,

Try the following code:

import java.util.*;
import javax.swing.JOptionPane;

class TelephoneDigit{
public static void main(String args[]){

String input= JOptionPane.showInputDialog(null, "Input character in UpperCase :");
char ch = input.charAt(0) ;
if(ch=='A'||ch=='B'||ch=='C'){
JOptionPane.showMessageDialog(null,"Corresponding digit is = 2");
}
if(ch=='D'||ch=='E'||ch=='F'){
JOptionPane.showMessageDialog(null,"Corresponding digit is = 3");
}
if(ch=='G'||ch=='H'||ch=='I'){
JOptionPane.showMessageDialog(null,"Corresponding digit is = 4");
}
if(ch=='J'||ch=='K'||ch=='L'){
JOptionPane.showMessageDialog(null,"Corresponding digit is = 5");
}
if(ch=='M'||ch=='N'||ch=='O'){
JOptionPane.showMessageDialog(null,"Corresponding digit is = 6");
}
if(ch=='P'||ch=='R'||ch=='S'){
JOptionPane.showMessageDialog(null,"Corresponding digit is = 7");
}
if(ch=='T'||ch=='U'||ch=='V'){
JOptionPane.showMessageDialog(null,"Corresponding digit is = 8");
}
if(ch=='W'||ch=='X'||ch=='Y'){
JOptionPane.showMessageDialog(null,"Corresponding digit is = 9");
}
if(ch=='Q'||ch=='Z'){
JOptionPane.showMessageDialog(null,"No digit corresponding to this character.");
}
}
}
Thanks