convertstring.java

Java程序设计技巧与开发实例附书源代码。

public class ConvertString {
   public static String switchCase(String s) {
      String newString = new String("");
      for (int i = 0; i < s.length(); i++) {
         char cc = s.charAt(i);
         if (Character.isLetter(cc)) {
            if (Character.isUpperCase(cc)) {
               cc = Character.toLowerCase(cc);
            }
            else if (Character.isLowerCase(cc)) {
               cc = Character.toUpperCase(cc);
            }
         }
         newString += cc;
      }
      return newString;
   }

   public static void main(String args[]) {
      System.out.print("Enter input string:  ");
      String input = Console.readString();
      System.out.println("String converted to: " + switchCase(input));
   }
}