why i am getting Input MIsmatch Exception in this code?

Question

I am just trying to read integer, double , string values from keyboard. it just working fine for integer and double. but when it comes to string, it was throwing a Input Mismatch Exception, so i cant able to read string from keyboard.

import java.util.Scanner;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int i = scan.nextInt();
        double d= scan.nextInt();
        String s=scan.nextLine();

        // Write your code here.

        System.out.println("String: " + s);
        System.out.println("Double: " + d);
        System.out.println("Int: " + i);
    }
}

@user158302 can you tell me why you import the Scanner class separately?? — Akash
– Akash, Commented Jan 4, 2020 at 14:23
"but when it comes to string, it was throwing a Input Mismatch Exception," is very had to believe since string can represent any characters provided by users so it shouldn't be mismatched. Other problem is that nextLine() most likely will return empty string (see Scanner is skipping nextLine() after using next() or nextFoo()? for more details). — Pshemo
– Pshemo, Commented Jan 4, 2020 at 14:57
Anyway to get proper answers we need to edit your question and provide proper minimal reproducible example (a.k.a. SSCCE) which aside from code also should include input you used while running your code and exact error message you are getting. — Pshemo
– Pshemo, Commented Jan 4, 2020 at 14:58

Ashish Modi · Accepted Answer · 2020-01-04 15:17:45Z

1

You have used double d= scan.nextInt();

instead use

double d= scan.nextDouble();

Moreover String is working fine for following input and output: 1 1 Hello

String: Hello

Double: 1.0

Int: 1

edited Jan 4, 2020 at 15:17

Ashish Modi

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answered Jan 4, 2020 at 14:31

Mr Nobody

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2 Comments

Soner from The Ottoman Empire Over a year ago

I think it has nothing to do with the object type since the result of the input is promoted automagically to double.

Mr Nobody Over a year ago

1 1.0 Hello Exception in thread "main" java.util.InputMismatchException

WJS · Accepted Answer · 2020-01-04 14:23:04Z

0

First, you're doing a scan.nextInt() for a double. Not the best thing to do. Second, try scan.next() to get an arbitrary type token.

        int i = scan.nextInt();
        double d= scan.nextDouble();
        String s=scan.next();

answered Jan 4, 2020 at 14:23

WJS

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Comments

Ranjith Bokkala · Accepted Answer · 2020-01-04 15:16:16Z

0

please check the below code. it is working for me.

      public class Solution {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        System.out.println("enter i value ");
        int i = scan.nextInt();
        System.out.println("enter d value ");
        double d= scan.nextDouble();
        System.out.println("enter s value ");
        String s=scan.next();


        // Write your code here.

        System.out.println("String: " + s);
        System.out.println("Double: " + d);
        System.out.println("Int: " + i);
    }

}

answered Jan 4, 2020 at 15:16

Ranjith Bokkala

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Comments

Soner from The Ottoman Empire · Accepted Answer · 2020-01-04 15:31:06Z

0

I think String s=scan.nextLine(); consumes the newline character coming from the followed calling double d= scan.nextInt();.

Here is my two cents.

double d = scan.nextInt();
scan.nextLine();
String s = scan.nextLine();

edited Jan 4, 2020 at 15:31

answered Jan 4, 2020 at 15:22

Soner from The Ottoman Empire

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