Prepends an Object to an Object array. : Array Insert Remove « Collections Data Structure « Java






  1. Java
  2. Collections Data Structure
  3. Array Insert Remove

Prepends an Object to an Object array.

     
import java.lang.reflect.Array;


     /*********************************************************************
     * Array manipulation for Java 1.1+.
     *
     * <p>
     * Java 1.1 compatible.
     * </p>
     *
     * @see
     *   ArrayLib2
     *
     * @version
     *   2003-04-07
     * @since
     *   2001-04-06
     * @author
     *   <a href="http://croftsoft.com/">David Wallace Croft</a>*/
public class Util{


    /*********************************************************************
    * Prepends an Object to an Object array.
    *
    * <p>
    * Example:
    * <code>
    * <pre>
    * String [ ]  stringArray
    *   = ( String [ ] ) ArrayLib.prepend ( new String [ ] { }, "" );
    * </pre>
    * </code>
    * </p>
    *
    * @throws NullArgumentException
    *
    *   If either argument is null.
    *
    * @return
    *
    *   Returns a new array with the same component type as the old array.
    *********************************************************************/
    public static Object [ ]  prepend ( Object [ ]  oldArray, Object  o )
    //////////////////////////////////////////////////////////////////////
    {


      Object [ ]  newArray = ( Object [ ] ) Array.newInstance (
        oldArray.getClass ( ).getComponentType ( ), oldArray.length + 1 );

      System.arraycopy ( oldArray, 0, newArray, 1, oldArray.length );

      newArray [ 0 ] = o;

      return newArray;
    }

}








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