public class stringbufferparm
{
   public static void alterstring(StringBuffer str)
   {

      // Replace characters of existing object.
      str.replace(0, str.length(),
		  "String from alterstring() method!");
      
      System.out.println("str = " + str);
   }
   
   public static void main(String[] args)
   {
      StringBuffer s;
      
      // Must use constructor
      s = new StringBuffer("String from main() method.");
      System.out.println("s = " + s);
      
      alterstring(s);
      
      System.out.println("s = " + s);
   }
}