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    <p>Here you can see the nature of <a href="http://www.cs.utexas.edu/users/ndale/Scanner.html" rel="nofollow noreferrer">Scanner</a>:</p> <blockquote> <p>double nextDouble()</p> <p>Returns the next token as a double. <strong>If the next token is not a float or is out of range, InputMismatchException is thrown.</strong></p> </blockquote> <p>Try to catch the exception</p> <pre><code>try { // ... } catch (InputMismatchException e) { System.out.print(e.getMessage()); //try to find out specific reason. } </code></pre> <p><strong>UPDATE</strong></p> <p><strong>CASE 1</strong></p> <p>I tried your code and there is nothing wrong with it. Your are getting that error because <strong>you must have entered <code>String</code> value</strong>. When I entered a numeric value, it runs without any errors. But once I entered <code>String</code> it <code>throw</code> the same <code>Exception</code> which you have mentioned in your question. </p> <p><strong>CASE 2</strong></p> <p>You have entered something, which is <strong>out of range</strong> as I have mentioned above. </p> <p>I'm really wondering what you could have tried to enter. In my system, it is running perfectly without changing a single line of code. Just copy as it is and try to compile and run it. </p> <pre><code>import java.util.*; public class Test { public static void main(String... args) { new Test().askForMarks(5); } public void askForMarks(int student) { double marks[] = new double[student]; int index = 0; Scanner reader = new Scanner(System.in); while (index &lt; student) { System.out.print("Please enter a mark (0..30): "); marks[index] = (double) checkValueWithin(0, 30); index++; } } public double checkValueWithin(int min, int max) { double num; Scanner reader = new Scanner(System.in); num = reader.nextDouble(); while (num &lt; min || num &gt; max) { System.out.print("Invalid. Re-enter number: "); num = reader.nextDouble(); } return num; } } </code></pre> <p>As you said, you have tried to enter <code>1.0</code>, <code>2.8</code> and etc. Please try with this code.</p> <p><strong>Note : Please enter number one by one, on separate lines. I mean, enter <code>2.7</code>, press enter and then enter second number (e.g. <code>6.7</code>).</strong></p>
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    1. POWhy am I getting InputMismatchException?
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    1. POWhy am I getting InputMismatchException?
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    1. COLike I said, I only type in double value such as 1.0, 5.8, etc and that still displays the same message
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    2. CO@TrầnTrung copy whole code and compile and run it. And, try to give some input, which you have tried earlier. Also, please check my **Note** at the last of my answer. And, let me know.If you got the solution, then also let me know.
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    3. COI think I found the problem, because my computer only recognize the ',' as for the fractional part while the inputs I used are with '.', this is why it wouldn't work.
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