Why am I getting Input mismatch exception error continously

Question

import java.util.*;
import java.lang.*;
import java.io.*;
class Main
{
    public static void main (String[] args)
    {
        Scanner sc=new Scanner(System.in);
        Servicecentre[] ab=new Servicecentre[4];
        String n,b;
        double c;
        boolean o;
        System.out.println("enter the details");
        for(int i=0;i<4;i++)
        {
            n=sc.nextLine();
            b=sc.nextLine();
            c=sc.nextDouble();
            sc.nextLine();
            o=sc.nextBoolean();
            ab[i]=new Servicecentre(n,b,c,o);
        }
        double ans1=findavg(ab);
        if(ans1==0)
        {
            System.out.println("No online service available");
        }
        else
        {
            System.out.format("%.1f",ans1);
        }
    }
    public static double findavg(Servicecentre[] ab)
    {
        double s=0;
        double c=0;
        for(int i=0;i<ab.length;i++)
        {
            if(ab[i].getonline())
            {
                s=s+ab[i].getcharge();
                c=c+1;
            }
        }
        if(c==0)
            return 0;
        else
            return s/c;
    }
}

class Servicecentre
{
    String name;
    String branch;
    double charge;
    boolean online;
    Servicecentre(String name, String branch,double charge,boolean online)
    {
        this.name=name;
        this.branch=branch;
        this.charge=charge;
        this.online=online;
    }
    String getname()
    {
        return name;
    }
    String getbranch()
    {
        return branch;
    }
    double getcharge()
    {
        return charge;
    }
    boolean getonline()
    {
        return online;
    }
}

This is the code of my program. I am asked to get input of following types

Name – String
branch – String
Charge – double
Online – boolean.

and I am asked to find average of the charge only when online is true.the below are their inputs.

TVS
Cochin
2000
false
Bajaj
Chennai
1500
true
TCH
TVM
1000
false
Arrow
Chennai
2500
true

I am repeatedly getting error on that bold line and I don't know what I have done wrong .the error is like

"Exception in thread "main" java.util.InputMismatchException at java.base/java.util.Scanner.throwFor(Scanner.java:939)
at java.base/java.util.Scanner.next(Scanner.java:1594)
at java.base/java.util.Scanner.nextDouble(Scanner.java:2564)
at HelloCodiva.main(Main.java:19)"

Kindly help me with the code. I am new to java.

Does this answer your question? [Scanner is skipping nextLine() after using next() or nextFoo()?](https://stackoverflow.com/questions/13102045/scanner-is-skipping-nextline-after-using-next-or-nextfoo) (if you enter your inputs one at a time, you'll notice this is the problem, i.e., it's skipping the first `nextLine` in the second iteration of your loop) — Federico klez Culloca, May 05 '21 at 06:53
As a tangent, you don't need to import `java.lang.*`. That's implicitly imported, so to speak. — Federico klez Culloca, May 05 '21 at 06:56

score 0 · Answer 1 · edited May 05 '21 at 06:50

0

Generally you get a java.util.InputMismatchException when you accidentally feed the wrong input. Validate your input before using it, and you won't receive this error.

Ex.

    Scanner sc = new Scanner(System.in);
    int number;
    System.out.println("Please enter a number:");
    while (!sc.hasNextInt()) {
        System.out.println("That's not a number!");
        sc.next(); // this is important as it clears the input buffer
    }
    number = sc.nextInt(); // finally recieve that input

edited May 05 '21 at 06:50

Dharman

21,838
18
57
107

answered May 05 '21 at 06:44

Forrest Lowe

21
5

Thank you for the quick answer. But when I tried the above method ,my input testcase passed until 7th one,even before entering 1500,it says that is not a number.I don't know why that happens. But https://codebashers10.blogspot.com/2021/04/TCS-Xplore-CPA-24-April-2021-Shift-2-Java-Coding-Solution.html have also solved the same way I did. But I get an error like input mismatch. – HARINI M May 05 '21 at 07:11

Why am I getting Input mismatch exception error continously

1 Answers1