import java.util.*;
class alphabet
{
static Scanner in=new Scanner(System.in);
public static void main()
{
char c=’ ‘;
do
{
System.out.println(“Enter a character”);
String s=in.nextLine();
c=s.charAt(0);
if(Character.isLetter(c))
{
System.out.println(“Entered character =”+s);
if(Character.isLowerCase(c))
System.out.println(“Output = “+(Character.toUpperCase(c)));

if(Character.isUpperCase(c))
System.out.println(“Output = “+(Character.toLowerCase(c)));
}
else
System.out.println(“Input has a number or special character,program terminated”);
}while(Character.isLetter(c));
}
}

In this post i have shared a java program which is mostly asked by students of computer science.

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