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>*/publicclass 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. *********************************************************************/publicstatic Object [ ] insert ( Object [ ] objectArray, Object o, int index ) //////////////////////////////////////////////////////////////////////  { if ( ( index < 0 ) || ( index > objectArray.length ) ) { thrownew 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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