lettercheck.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

public class LetterCheck
{
   public static void main(String args[]) 
   {
      char symbol = 'A';
      symbol = (char)(128.0*Math.random());        // Generate a random character

      if(symbol >= 'A')                            // Is it A or greater?
      {
         if(symbol <= 'Z')                         // yes, so is it Z or less?
            // Then it is a capital letter
            System.out.println("You have the capital letter " + symbol);
         else                                      // It is not Z or less
            if(symbol >= 'a')                      // So is it a or greater?
               if(symbol <= 'z')                   // Yes, so is it z or less?
                  // Then it is a small letter
                  System.out.println("You have the small letter " + symbol);
               else                                // It is not less than z
                  System.out.println(
                            "The code is greater than a but it's not a letter");
            else
               System.out.println(
                            "The code is less than a and its not a letter");
       }
       else
          System.out.println("The code is less than A so it's not a letter");
   }
}