Special value used to signify the target is not a valid data element. In Processing, you may run across the keyword null when trying to access data which is not there.


  • String content = "It is a beautiful day.";
    String[] results;  // Declare empty String array
    results = match(content, "orange");
    // The match statement above will fail to find
    // the word "orange" in the String 'content', so
    // it will return a null value to 'results'.
    if (results == null) {
      println("Value of 'results' is null.");  // This line is printed
    } else {
      println("Value of 'results' is not null!");  // This line is not printed