Capitalize the first character of the given string : String Format « Data Type « Java Tutorial

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import java.util.Map;


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public class Main{
  /**
   * Capitalize the first character of the given string.
   *
   * @param string     String to capitalize.
   * @return           Capitalized string.
   *
   * @throws IllegalArgumentException    String is <kk>null</kk> or empty.
   */
  public static String capitalize(final String string)
  {
     if (string == null)
        throw new NullPointerException("string");
     if (string.equals(""))
        throw new NullPointerException("string");

     return Character.toUpperCase(string.charAt(0)) + string.substring(1);
  }
}