Answer 1

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {

Scanner myLetter=new Scanner(System.in);
System.out.print("Enter letter: ");
char let=myLetter.next().charAt(0);
switch(let) {
case 'A':
System.out.println("Capital letter A");
break;
case 'a':
System.out.println("Small letter a");
break;
default:
System.out.println("Not letter A");
break;
}
}
}

Have a look at the isLowerCase() method on java docs... 😉