// http://www.java2s.com/Tutorial/Java/0120__Development/Replaceonestringwithanotherstring.htm

public class MainClass
{
   public static void main( String args[] )
   {
      String firstString = "This sentence ends in 5 stars *****";
         
      System.out.printf( "Original String 1: %s\n", firstString );

      // replace 'stars' with 'carets'
      firstString = firstString.replaceAll( "stars", "carets" );

      System.out.printf(
         "\"carets\" substituted for \"stars\": %s\n", firstString );

   }
}k