lettercheck.java

非常好的java事例以及带源码事例的java2教程

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

      if(Character.isUpperCase(symbol))
        System.out.println("You have the capital letter " + symbol);
      else
        if(Character.isLowerCase(symbol))
          System.out.println("You have the small letter " + symbol);
        else
          System.out.println("The code is not a letter");
   }
}