Question

Hi I am quite confused with how to use scanner for my java project? Can someone help me with this? Thanks

Answer 1

/* BELOW DOWN IS SIMPLE PROGRAM WHICH USE SCANNER CLASS TO INPUT STRING AND INTEGER */

import java.util.Scanner; // FIRST IMPORT THIS CLASS

public class Example {

public static void main(String[] args) {
Scanner sc = new Scanner(System.in); // DECLARE ITS OBJECT
System.out.print("Enter name: ");
String name = sc.nextLine(); // FOR STRING INPUT USE .nextLine() method
System.out.print("Enter first Integer: ");
sc = new Scanner(System.in); // to clear buffer
int a = sc.nextInt(); // for integer input use .nextInt() input
System.out.print("Enter second Integer: ");
sc = new Scanner(System.in);
int b = sc.nextInt();
System.out.println("Sum is: "+ (a+b));
}
}

/* OUTPUT*/

/* TYPE OF INPUT YOU WANT YOU CAN CALL METHOD FROM SCANNER CLASS

FOR EG: TO TAKE CHARACTER INPUT USE .next() */'

/* THIS IS LIST OF VARIOUS METHOD */

import java.util.Scanner;
import java.util.regex.Pattern;

public class Example {

   public static void main(String[] args) {

       // Initialize Scanner object
       Scanner scan = new Scanner("Vince1;Gandhi;Albert");
       // declare the delimiter to be used by Scanner object
       scan.useDelimiter(";");

       /*Initialize the String pattern which
       signifies that the String token contains
       characters of the alphabet only*/
       Pattern pattern = Pattern.compile("[A-Za-z]*");

       while(scan.hasNext()){
           // check if the token consists of declared pattern
           if(scan.hasNext(pattern)){
               System.out.println(scan.next());
           }
           else
               scan.next();
       }

       // closing the scanner stream
       scan.close();

   }

}

/* YOU NEED PATTERN CLASS TO MATCH REGEX */