what does e.close(); do?

Question

what is the work of e.close(); ??
In this example code, there are no work of e.close(); but what about others? when to use it? and for what? I need a good explaination ☺

Example :
import java.util.Scanner;
public class GetEqual{
public static void main(String[]args){

int a,b,sum;
Scanner e=new Scanner(System.in);
System.out.println("Enter 1st Num : ");
a= e.nextInt();
System.out.println("Enter 2nd Num : ");
b=e.nextInt();
e.close();
sum=a+b;
System.out.println("Answer is : "+sum);
}
}

Answer 1

https://www.google.com/url?q=https://www.tutorialspoint.com/java/util/scanner_close.htm&sa=U&ved=0ahUKEwihvebj_9PaAhUD0xQKHQFFAqkQFggLMAA&usg=AOvVaw3w6obaDWp3UOZMQlYj1W3u

https://www.quora.com/Why-do-we-need-to-close-the-scanner-class-in-java&sa=U&ved=0ahUKEwihvebj_9PaAhUD0xQKHQFFAqkQFggYMAM&usg=AOvVaw2UaABtlHsmhfXxA3_MB6f4