java.util.Vector.toArray() Method

Description

The toArray(T[] a) method is used to return an array containing all of the elements in this Vector in the correct order.

Declaration

Following is the declaration for java.util.Vector.toArray() method

public <T> T[] toArray(T[] a)

Parameters

• a--This is the array into which the elements of the Vector are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.

Return Value

The method call returns an array containing the elements of the Vector.

Exception

• ArrayStoreException--This exception is thrown if the runtime type of a is not a supertype of the runtime type of every element in this Vector.

• NullPointerException--This exception is thrown if if the given array is null.

Example

The following example shows the usage of java.util.Vector.toArray() method.

package com.tutorialspoint;

import java.util.*;
import java.util.Arrays;

public class VectorDemo {
   public static void main(String[] args) {
      // create an empty Vector vec with an initial capacity of 4      
      Vector<Integer> vec = new Vector<Integer>(4);
      // create an array
      Integer[] anArray = new Integer[4];

      // use add() method to add elements in the vector
      vec.add(4);
      vec.add(3);
      vec.add(2);
      vec.add(1);
      
      // fill the array from the vector
      vec.toArray(anArray); 

      // check the content of the array
      System.out.println("Elements are: ");  
      for (int i = 0; i < anArray.length; i++) {
         System.out.println(anArray[i]);
      }
   }    
}

Let us compile and run the above program, this will produce the following result.

Elements are: 
4
3
2
1