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Java Vector copyInto() Method - GeeksforGeeks

Java Vector copyInto() Method

Last Updated : 11 Jul, 2025

In Java, the copyInto() method is used to copy all the components from one vector to another array, having enough space to hold all of the components of the vector. It is to be noted that the index of the elements remains unchanged. The elements present in the array are replaced by the elements of the vector starting from index 0.

Example: Here, we use the copyInto() method to copy all the elements from a Vector into an array of type Integer.

Java


 // Java program to demonstrate the 
// use of copyInto() with Integer type
import java.util.Vector;

class Geeks {
  
  public static void main(String[] args) {
    
        // Create a Vector and 
        // add some elements
        Vector<Integer> v = new Vector<>();
        v.add(1);
        v.add(2);
        v.add(3);

        // Display the Vector elements
        System.out.println("Vector: " + v);

        // Create an array with 
        // some initial elements
        Integer[] arr = new Integer[] { 10, 20, 30 };

        // Display the initial state of the array
        System.out.print("The initial array is: ");
        for (Integer i : arr) {
            System.out.print(i + " ");
        }
        System.out.println();

        // Use the copyInto() method to copy 
        // the elements from the Vector to the array
        v.copyInto(arr);

        // Display the final array after copying
        System.out.print("The final array is: ");
        for (Integer i : arr) {
            System.out.print(i + " ");
        }
    }    
}

Output

Vector: [1, 2, 3]
The initial array is: 10 20 30 
The final array is: 1 2 3

Syntax of Vector copyInto() Method

public void copyInto(Object[] array )

Parameter: The parameter array[] is of the type vector. This is the array into which the elements of the vector are to be copied.

Exceptions:

NullPointerException: If the provided array is null.
ArrayIndexOutOfBoundsException: If the array doesn't have enough space to hold all elements of the Vector.

Example 2: Here, we use the copyInto() method to copy all the elements from a Vector into an array of type String.

Java


 // Java program to demonstrate the 
// use of copyInto() with String type
import java.util.Vector;

class Geeks {
  
    public static void main(String[] args) {
      
        // Create a Vector and 
        // add some elements
        Vector<String> v = new Vector<>();
        v.add("Geeks");
        v.add("For");
        v.add("Geeks");

        // Display the Vector elements
        System.out.println("Vector: " + v);

        // Create an array with 
        // some initial elements
        String[] arr = new String[] { "Hello", "World", "Java" };

        // Display the initial state of the array
        System.out.print("The initial array is: ");
        for (String i : arr) {
            System.out.print(i + " ");
        }
        System.out.println();

        // Use the copyInto() method to copy 
        // the elements from the Vector to the array
        v.copyInto(arr);

        // Display the final array after copying
        System.out.print("The final array is: ");
        for (String i : arr) {
            System.out.print(i + " ");
        }
    }
}

Output

Vector: [Geeks, For, Geeks]
The initial array is: Hello World Java 
The final array is: Geeks For Geeks

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