Java Vector copyInto() Method

The copyInto() method of Java Vector class used to copy the elements of the vector which is in use into the specified array. In this, the position of the elements is the same in both the vector and an array.

Syntax:

Following is the declaration of copyInto() method:

Parameter:

Parameter	Description	Required/Optional
anArray	It is the array into which the components get copied.	Required

Returns:

The copyInto() method has return type void so, it does not return anything.

Exceptions:

NullPointerException- This method has thrown an exception if the specified array is null.

IndexOutOfBoundsException- This method has thrown an exception if the specified array is unable to hold all the components of this vector.

Compatibility Version:

Java 1.2 and above

Example 1:

import java.util.Vector;
public class VectorCopyIntoExample1 {  
	public static void main(String arg[]) {		
	    //Create an empty Vector1
	    Vector<Integer> vec = new Vector<>(5);	 
	    //Add elements in the vector
	    vec.add(1);
	    vec.add(2);
	    vec.add(3);
	    vec.add(4);
	    vec.add(5);	        	    
	    Integer[] arr = new Integer[5];	    
	    //copy elements of vector into an array
	    vec.copyInto(arr);  
	    System.out.println("Elements in an array are: ");
	    for(Integer num : arr)
	    {
	        System.out.println(num);
	    }	   
	 }            
}

Test it Now

Output:

Elements in an array are: 
1
2
3
4
5

Example 2:

import java.util.Vector;
public class VectorCopyIntoExample2 {  
	public static void main(String arg[]) {		
		//Create an empty Vector
            Vector<String> vector1 = new Vector<>();        
            //Add elements to the Vector
            vector1.add("Rahul");
            vector1.add("Vijay");
            vector1.add("Shyam");
            vector1.add("Rohan");        
            //Create an new Array with intial size 4
            String tempArray[] = new String[4];       
            //Copy Vector element to Array
            vector1.copyInto(tempArray);       
            System.out.println("Elements of the Array: ");
            //Print elements of an Array
            for(String temp : tempArray)
            {
                System.out.println(temp);
            }
	}            
}

Test it Now

Output:

Elements of the Array: 
Rahul
Vijay
Shyam
Rohan

Example 3:

import java.util.*;
public class VectorCopyIntoExample3 {  
	public static void main(String arg[]) {		
	     Vector<Integer> vec = new Vector<Integer>();
	     vec.add(4);
	     vec.add(3);
	     vec.add(2);
	     vec.add(1);	      
	     Integer anArray[] = new Integer[3];	            
	     //copy vector elements into an array
	     vec.copyInto(anArray);	      
	     for (Integer number : anArray) {         
	         System.out.println("Number= " + number);
	     }                
	}            
}

Test it Now

Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException
	at java.base/java.lang.System.arraycopy(Native Method)
	at java.base/java.util.Vector.copyInto(Vector.java:200)
	at myPackage.VectorCopyIntoExample3.main(VectorCopyIntoExample3.java:12)

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