Java Vector firstElement() Method with Examples

by Online Tutorials Library July 22, 2022

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());          }              }  

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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());             }              }  

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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());          }              }  

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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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Java Vector firstElement() Method with Examples

Java Vector firstElement() Method

Syntax:

Parameter:

Returns:

Exceptions:

Compatibility Version:

Example 1:

Example 2:

Example 3:

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