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Questions tagged [inputmismatchexception]

Use this tag on questions regarding input mismatch exceptions that occur when using the `Scanner` object.

The InputMismathException is a Java I/O exception that is thrown when the Scanner object encounters an input which it does not expect. An example would be expecting a double, but receiving a String token instead. This is a runtime exeception that inherits from NoSuchElementException.

258 questions
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How to input 1~2 instead of 1 2. InputMismatchException

So I was solving a problem on Techgig which goes like this : There I have to print the sequence of Fibonacci numbers till 10 places in array and the first two inputs were entered by the user. My code goes like: import java.io.*; import…
Aishwary Srivastava
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Why does this code keep on looping if there's an InputMismatchException?

Why does this code keep on looping if there's an InputMismatchException? When you input a zero, the catch works, but if you enter a string, the loop becomes infinite. import java.util.*; public class TryCatch { public static void…
gendave
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inputMismatchException java

( ANSWER: in the switch case I forgot my break statements and I guess that was throwing the Scanner off! ) I'm writing a program to read a file that contains three kinds of shapes, followed by their corresponding dimension and write them into an…
Evan Jones
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Issue with Reading two Int values from a file

I have file with the below data A,8,43 B,7,42, C,9,34 I am using the below code to read the data Scanner input = new Scanner(new File("D:\\test.txt")); input.useDelimiter(",|\n"); while(input.hasNext()) { String name = input.next(); int…
user7076183
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Getting an "Exception in thread "main" java.util.InputMismatchException" error inside a do While Loop

import java.util.Random; import java.util.Scanner; public class Jogo { Scanner scanner = new Scanner(System.in); int tipoJogo; int turno; Barco[] jfA,jfB; Random random = new Random(); public Jogo(Barco[]fA, Barco[]fB, int tamanhomax, int tj) { …
João Fróis
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Can't use scanner for string and integer at the same time

I'm working on this code which takes an integer as a test case then takes a string and an integer for each test case But I keep getting this exception: Exception in thread "main" java.util.InputMismatchException at…
Maharsh Mangal
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Constant loop when InputMismatchExpection has been caught instead of retrying/scanning keyboard input again

Whenever an Input Mismatch is caught there is an infinite loop (example entering ];), instead of trying the "option = scanner.nextInt();" again. However typing a normal invalid input like "7" works fine. I don't want to use a "break;" because I want…
Alex
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Scanner Mismatch Exception when reading text file

My scanner is reading from a text file with the use of a delimiter. However when I run the program the only line that gets printed out is the first line of data then I get thrown an input mismatch exception. I believe the error is that it doesn't…
Luke G
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Java InputMismatchException Error

I've been given a task to make some conversions from ft and in to cm. I've gotten most of this down and the conversions do work. I also want to include the statement of A negative number... or A non-digit... when I type a string, for example, or a…
adhamncheese
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System input in java doesn't work correctly

I'm trying to make a program that takes Ints and give me sum and I want to make it using regex. Input contains numbers, symbols and letters. For example when I write: java GiveMeSum 4 2 1 -5 or java GiveMeSum 4k "2 1 !-5 program should write 2 But…
Elliot Wayne
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Why am i getting this error?(Double Array Method)

I am getting the error "Exception in thread "main" java.util.InputMismatchException at java.util.Scanner.throwFor(Scanner.java:909) at java.util.Scanner.next(Scanner.java:1530) at java.util.Scanner.nextInt(Scanner.java:2160) at …
user6267046
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Cannot find reason for InputMismatchException

I'm having an issue with Scanner in that it seems to be taking the input value type and forcing the next time the user inputs a value to be of the same type. I cannot find any reason why this code is not working and gives me an…
UnionSquareBanter
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InputMismatchException in thread "main"

First of all i am compete noob in Java. I tried to get the user input. Eclipse shows this error whenever i try to type double variable: Exception in thread "main" java.util.InputMismatchException at java.util.Scanner.throwFor(Unknown Source) at…
user7332667
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persistent InputMismatchException errors

In this code, I create a scanner to read a file full of ASCII values, which are ints. I put them in a 2d array of chars using nested loops after I typecast them to type 'char', and then proceed to print the resulting arrays in a separate method. the…
redbull_nowings
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Exception Handling for no user input in Java

I am trying to get my program to exception handle for if the user inputs nothing so they will get an error message of "Error, enter a dollar amount greater than 0" or "Error, Enter a 1, 2 or 3". As of now, the program does nothing if the user just…
ecooper10
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