Java Vector firstElement() Method

The firstElement() method of Java Vector class is used to get the first element ( at index 0 ) of the vector which is in use.

Syntax:

Following is the declaration of firstElement() method:

Parameter:

This method does not accept any parameter.

Returns:

The firstElement() method returns the first component of the vector which is in use.

Exceptions:

NoSuchElementException- This method has thrown an exception if the vector has an empty element.

Compatibility Version:

Java 1.2 and above

Example 1:

import java.util.*;
public class VectorFirstElementExample1 {  
	public static void main(String arg[]) {	
	    //Create an empty vector
	    Vector<Integer> vec = new Vector<>();
	    //Add element in the vector
	    vec.add(91);
	    vec.add(21);
	    vec.add(31);	    
	    vec.add(41);
	    vec.add(51);
	    //Get the first element
	    System.out.println("First element of the vector is = "+vec.firstElement());    
	    }            
}

Test it Now

Output:

First element of the vector is = 91

Example 2:

import java.util.*;
public class VectorFirstElementExample2 {  
	public static void main(String arg[]) {	
	    //Create an empty vector
	    Vector < String > colors = new Vector < String > ();
	    //Add elements in the vector
          colors.add("White");
          colors.add("Green");
          colors.add("Black");
          colors.add("Pink");
          //Get the element at specified index
          System.out.println("First color of this vector = " +colors.firstElement());       
	    }            
}

Test it Now

Output:

First color of this vector = White

Example 3:

import java.util.*;
public class VectorFirstElementExample3 {  
	public static void main(String arg[]) {	
	    //Create an empty vector
	    Vector<Integer> vecObject = new Vector<Integer>();	      	    
	    //Get the element at specified index
	    System.out.println("First element of the vector = "+vecObject.firstElement());    
	    }            
}

Test it Now

Output:

Exception in thread "main" java.util.NoSuchElementException
	at java.base/java.util.Vector.firstElement(Vector.java:511)
	at myPackage.VectorFirstElementExample3.main(VectorFirstElementExample3.java:8)

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