JAVA EE: Java : Collection Framework : Vector (toArray Parameter)

Saturday 13 December 2014

Java : Collection Framework : Vector (toArray Parameter)

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VectorExample.java

import java.util.Vector;

/*
 *  Example of toArray(T[] a) method. 
 */
public class VectorExample
{
    public static void main( String[] args )
    {
        Vector<Integer> vector = new Vector<Integer>();

        vector.add(20);
        vector.add(30);
        vector.add(40);
        vector.add(50);

        System.out.println("vector  : " + vector + "\n");

        Integer[] integerArray = new Integer[vector.size()];

        /*
         * Returns an array containing all of the elements in this Vector in the
         * correct order; the runtime type of the returned array is that of the
         * specified array. If the Vector fits in the specified array, it is
         * returned therein. Otherwise, a new array is allocated with the
         * runtime type of the specified array and the size of this Vector.
         * 
         * If the Vector fits in the specified array with room to spare (i.e.,
         * the array has more elements than the Vector), the element in the
         * array immediately following the end of the Vector is set to null.
         * (This is useful in determining the length of the Vector only if the
         * caller knows that the Vector does not contain any null elements.)
         */

        integerArray = vector.toArray(integerArray);

        for( Integer value : integerArray )
        {
            System.out.println(value);
        }

    }
}