Inserts an Object into an Object array at the index position. : Array Insert Remove « Collections Data Structure « Java






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

Inserts an Object into an Object array at the index position.

     
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{

    /*********************************************************************
    * Inserts an Object into an Object array at the index position.
    *
    * <p>
    * Example:
    * <code>
    * <pre>
    * String [ ]  stringArray
    *   = ( String [ ] ) ArrayLib.insert ( new String [ ] { }, "", 0 );
    * </pre>
    * </code>
    * </p>
    *
    * @throws NullArgumentException
    *
    *   If objectArray or o is null.
    *
    * @throws IndexOutOfBoundsException
    *
    *   If index < 0 or index > objectArray.length.
    *
    * @return
    *
    *   Returns a new array with the same component type as the old array.
    *********************************************************************/
    public static Object [ ]  insert (
      Object [ ]  objectArray,
      Object      o,
      int         index )
    //////////////////////////////////////////////////////////////////////
    {


      if ( ( index < 0                  )
        || ( index > objectArray.length ) )
      {
        throw new IndexOutOfBoundsException (
          "index out of range:  " + index );
      }

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


      System.arraycopy ( objectArray, 0, newObjectArray, 0, index );

      newObjectArray [ index ] = o;

      System.arraycopy ( objectArray, index, newObjectArray, index + 1,
        objectArray.length - index );

      return newObjectArray;
    }

}








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