Java - Write code to truncate string to a particular length

Requirements

Write code to truncate string to a particular length

Demo

public class Main {
  public static void main(String[] argv) {
    String string = "book2s.com";
    int length = 4;
    System.out.println(truncatString(string, length));
  }//  w w  w  . j a va 2s.  com

  /**
   * This method truncates string to a particular length
   * 
   * @param string
   * @param length
   *          size to which new string required
   * @return truncated string
   */
  public static String truncatString(String string, int length) {

    if (string == null)
      return "";

    if (string.length() < length)
      return string;

    return string.substring(0, length);

  }
}