Java Vector AddAll() Method with Examples

Java Vector addAll() Method with Examples

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In the previous article we have discussed Java Vector addElement() Method with Examples

In this article you will see the use of Vector addAll() method in java along with suitable examples.

Java Vector addAll() Method with Examples

Let’s see addAll() method with examples to understand it more clearly.

Void addAll(Collection c):

This java.util.Vector.addAll(Collection c) method adds all the elements inside a collection to the end of a vector at once. This method is of type void hence it does not return anything.

Syntax-

vectorName.addAll(Collection col)

Where,

  • vectorName refers to the name of your Vector.
  • Collection col refers to the collection that will be added into the vector.

Approach:

  • Create a vector of type Integer and add elements into it.
  • Create a Collection of type Integer and add elements into it.
  • Add the collection to vector by using addAll(Collection col) method.
  • Print the new vector.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args)
    {
        // Create a Vector of Integer datatype with size 6
        Vector<Integer> vec = new Vector<Integer>(6);
        // Adding some elements to the vector
        vec.add(11);
        vec.add(65);
        vec.add(82);
        vec.add(27);
        vec.add(89);
        vec.add(46);
        // Prints the old vector elements and the vector size
        System.out.println("The old vector is "+vec+" of size "+vec.size());
        
        //collection created
        Collection<Integer> col = new ArrayList<Integer>();
        col.add(29);
        col.add(38);
        col.add(74);
        
        //Adding a collection to Vector
        vec.addAll(col);
        
        // Prints the vector elements and the vector size
        System.out.println("The new vector is "+vec+" of size "+vec.size());
    }
}
Output:

The old vector is [11, 65, 82, 27, 89, 46] of size 6
The new vector is [11, 65, 82, 27, 89, 46, 29, 38, 74] of size 9

Void addAll(int Index, Collection c):

This java.util.Vector.addAll(int Index, Collection c) method adds all the elements inside a collection to the specified index of a vector at once. This method is of type void hence it does not return anything.

Syntax-

vectorName.addAll(int Index, Collection col)

Where,

  • int Index refers to the index of vector where Collection will be added.

Approach:

  • Create a vector of type Integer and add elements into it.
  • Create a Collection of type Integer and add elements into it.
  • Add the collection to the specified index of vector by using addAll(int Index, Collection col) method.
  • Print the new vector.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args)
    {
        // Create a Vector of Integer datatype with size 6
        Vector<Integer> vec = new Vector<Integer>(6);
        // Adding some elements to the vector
        vec.add(11);
        vec.add(65);
        vec.add(82);
        vec.add(27);
        vec.add(89);
        vec.add(46);
        // Prints the old vector elements and the vector size
        System.out.println("The old vector is "+vec+" of size "+vec.size());
        
        //collection created
        Collection<Integer> col = new ArrayList<Integer>();
        col.add(29);
        col.add(38);
        col.add(74);
        
        //Adding a collection from index-1 of the Vector
        vec.addAll(1,col);
        
        // Prints the vector elements and the vector size
        System.out.println("The new vector is "+vec+" of size "+vec.size());
    }
}
Output:

The old vector is [11, 65, 82, 27, 89, 46] of size 6
The new vector is [11, 29, 38, 74, 65, 82, 27, 89, 46] of size 9

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