Java Vector add() Method

The add() is a Java Vector class method which is used to insert the specified element in the given Vector. There are two different types of Java add() method which can be differentiated depending on its parameter. These are:

Java Vector add(int index, E element) Method
Java Vector add(E e) Method

Java Vector add(int index, E element)

This method is used to insert the specified element at the specified position in the given Vector.

Java Vector add(E e)

This method appends the specified element to the end of this vector.

Syntax

Following is the declaration of add() method:

public void add(int index, E element) 
public boolean add(E e)

Parameter

Parameter	Description	Required/Optional
index	It is the index at which the specified element is to be inserted.	Required
e	It is the element which will be appended to this vector.	Required
element	It is the element which will be inserted at the specified location.	Required

Return

The add(int index, E element) method does not return anything because its return type is void.

The add(E e) method returns true if the specified element added successfully, otherwise returns false.

Exceptions

ArrayIndexOutOfBoundsException- This method has thrown an exception if the index is out of range.

Compatibility Version

Java 1.2 and above

Example 1

import java.util.Vector;
public class VectorAddExample1 {  
	public static void main(String arg[]) {
		//Create an empty Vector with an initial capacity of 5      
	      Vector<String> vc = new Vector<>(4);
	      //Add elements in the vector by using add() method
	      vc.add("A");
	      vc.add("B");
	      vc.add("C");
	      vc.add("D");
	      vc.add("E");
	      //Print all the elements of a Vector
	      System.out.println("--Elements of Vector are--"); 	      
	      for (String str : vc) {         
	         System.out.println("Alphabet= " +str);
	      }
      }
}

Test it Now

Output:

--Elements of Vector are--
Alphabet= A
Alphabet= B
Alphabet= C
Alphabet= D
Alphabet= E

Example 2

import java.util.Vector;
public class VectorAddExample2 {  
	public static void main(String arg[]) {
        //Create vector object
        Vector<String> vr = new Vector<>();        
        vr.add(0, "Java");
        vr.add(1, "Android");
        vr.add(2, "Python");
        vr.add(3, "JavaTpoint");
        vr.add(4, "Hindi100");        
        System.out.println("Vector is: " + vr);
        }
}

Test it Now

Output:

Vector is: [Java, Android, Python, JavaTpoint, Hindi100]

Example 3

import java.util.Vector;
public class VectorAddExample3 {  
	public static void main(String arg[]) {		
		//Create a Vector and add elements		
		Vector<String> vector = new Vector<>();		
		vector.add("A");		
		vector.add("B");		
		vector.add("C");				  			
		vector.add(10,"H");	
		System.out.println("Elements in Vector : ");		
		for(int i=0; i < vector.size(); i++)	
			System.out.println("Element: "+vector.get(i));
        }
}

Test it Now

Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 10 > 3
	at java.base/java.util.Vector.insertElementAt(Vector.java:619)
	at java.base/java.util.Vector.add(Vector.java:857)
	at myPackage.VectorAddExample3.main(VectorAddExample3.java:11)

Example 4

import java.util.Vector;
public class VectorAddExample4 {  
	public static void main(String arg[]) {
		  Vector <String> colors = new Vector <String>();
	        colors.add("White");
	        colors.add("Green");
	        colors.add("Black");
	        colors.add("Pink");	 
	        for (String color: colors) {
	            System.out.println("Element at index: "+colors.indexOf(color) + " Color: " +color);
	        }	 
	        colors.add(1, "Yellow");	 
	        System.out.println("New color Yellow added at first position."); 
	        for (String color: colors) {
	            System.out.println("Element at index: "+colors.indexOf(color) + " Color: " +color);
	        }
       }
}

Test it Now

Output:

Element at index: 0 Color: White
Element at index: 1 Color: Green
Element at index: 2 Color: Black
Element at index: 3 Color: Pink
New color Yellow added at first position.
Element at index: 0 Color: White
Element at index: 1 Color: Yellow
Element at index: 2 Color: Green
Element at index: 3 Color: Black
Element at index: 4 Color: Pink

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