CODEWITHSUNDEEP
javajava.util.scannerinputmismatchexception
kylel95
kylel95

Reputation: 139

InputMismatchException when reading numbers and text using Scanner

I would like to have the user input a line of text as long as x is not equal to the value of numOfContestans. When I run the code, I get an InputMismatchException. Does anyone have an idea on how to solve this error?

try {
    int numOfContestants = scan.nextInt();
    int problems = scan.nextInt();
    scan.nextLine();
    int x = 0;

    while (x != numOfContestants) {
        String input = scan.nextLine();
        x++;
    }
    System.out.println(problems);
} catch(InputMismatchException e) {
    System.out.println("Something went wrong");
}

Upvotes: 0

Views: 259

Answers (1)

downeyt
downeyt

Reputation: 1306

You do not list the input that causes a problem. If you try this input,

3
2
line1
line2
line3

nextInt does not read the CR/LF at the end of the line. The first call to nextLine is empty. The loop runs the correct amount of times, but the first pass does not read a complete line. After reading the problems, read the next line.

int problems = scan.nextInt();        
String input = scan.nextLine();

You could also enter you data so it looks like

3
2 line1
line2
line3

Then your code works.

I could not generate an error, as long as the intergers were entered properly.

I do not know how nextLine could cause a TypeMismatchException. I have run this code and can only cause such an error if an integer is entered incorrectly. Please provide the input that causes the error.

Upvotes: 1

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