Vector firstElement() Method in Java
The java.util.vector.firstElement() method in Java is used to retrieve or fetch the first element of the Vector. It returns the element present at the 0th index of the vector
Syntax:
Vector.firstElement()
Parameters: The method does not take any parameter.
Return Value: The method returns the first element present in the Vector. Below programs illustrate the Java.util.Vector.firstElement() method:
Program 1:
Java
import java.util.*;
public class VectorDemo {
public static void main(String args[])
{
Vector<String> vec_tor = new Vector<String>();
vec_tor.add("Welcome");
vec_tor.add("To");
vec_tor.add("Geeks");
vec_tor.add(" 4 ");
vec_tor.add("Geeks");
System.out.println("Vector: " + vec_tor);
System.out.println("The first element is: "
+ vec_tor.firstElement());
}
}
|
Output:
Vector: [Welcome, To, Geeks, 4, Geeks]
The first element is: Welcome
Program 2:
Java
import java.util.*;
public class VectorDemo {
public static void main(String args[])
{
Vector<Integer> vec_tor = new Vector<Integer>();
vec_tor.add( 10 );
vec_tor.add( 15 );
vec_tor.add( 30 );
vec_tor.add( 20 );
vec_tor.add( 5 );
System.out.println("Vector: " + vec_tor);
System.out.println("The first element is: "
+ vec_tor.firstElement());
}
}
|
Output:
Vector: [10, 15, 30, 20, 5]
The first element is: 10
Time complexity: O(1).
Auxiliary Space: O(n). // n is the size of the vector.
Last Updated :
24 May, 2023
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