31. String isEmpty( ) example

• Code that uses the isEmpty method:

  
  String customerNumber = "";
  //if ( customerNumber.equals("") )    // old way
  //if ( customerNumber.length() == 0 ) // old way
  if ( customerNumber.isEmpty() ) {     // Java 1.6+
      System.out.println(
          "customerNumber contains an empty string.");
  }