Input Mismatch Exception problem with code

Question

I'm having some trouble here. Basically, I am given the line of input

5,4 4,5 8,7=6,3 3,2 9,6 4,3=7,6=9,8=5,5 7,8 6,5 6,4

I am splitting by the =, then adjusting the coordinates, adding them back to array rows and shifting them either forward or backward.

The problem is, as soon as I start my program, it throws an input mismatch exception and not sure why.

Here is my code:

public class Pirate {
    
    int singleCoordinateX;
        int singleCoordinateY;
        PrintStream out;
        String position;
        Coordinate coordinates;
        CoordinateRow newSplitStringRow;
        String splitString;
        CoordinateRow adjustedSplitStringRow;
        CoordinateRow newAdjustedSplitStringRow;
    
    Pirate() {
    out = new PrintStream(System.out);
    position = "front";
            newSplitStringRow = new CoordinateRow();
            adjustedSplitStringRow = new CoordinateRow();
            newAdjustedSplitStringRow = new CoordinateRow();
    }
    
void start() {

    Scanner newCoordinateInputData = UIAuxiliaryMethods.askUserForInput().getScanner();

    String singleLineInputString = newCoordinateInputData.nextLine();

    splitLineString(singleLineInputString);

    printCoordinateRow();
}


void splitLineString(String singleLineInputString) {

    String[] newSingleLineStringArray = singleLineInputString.split("=");

    for(int i = 0; i < newSingleLineStringArray.length; i++) {

        splitString = newSingleLineStringArray[i];
        
        Scanner splitStringScanner = new Scanner(splitString);
        
        newCoordinateRow(splitStringScanner);
        
        placeCoordinateRow(newCoordinateRow(splitStringScanner));
    }
        
}


CoordinateRow newCoordinateRow(Scanner splitStringScanner) {
    
    splitStringScanner.useDelimiter("\\s+");
    
    while(splitStringScanner.hasNext()) {
        
        String coordinateString = splitStringScanner.next();
        
        coordinates = convertCoordinates(coordinateString);
        
        newSplitStringRow.addSingleCoordinateToBack(coordinates);
        
    }
    
    return newSplitStringRow;
    
}

Coordinate convertCoordinates(String coordinateString) {
    
    Scanner coordinateScanner = new Scanner(coordinateString);
    
    coordinateScanner.useDelimiter(",");
    
    while(coordinateScanner.hasNext()) {
        
        singleCoordinateX = coordinateScanner.nextInt();
        
        singleCoordinateY = coordinateScanner.nextInt();
        
        coordinates = new Coordinate(singleCoordinateX, singleCoordinateY);
    }
    
    return coordinates;
}



CoordinateRow placeCoordinateRow(CoordinateRow adjustedSplitStringRow) {

    if(position == "front") {

        newAdjustedSplitStringRow.addCoordinateRowFront(adjustedSplitStringRow);

        position = "back";

    } else if(position == "back") {

        newAdjustedSplitStringRow.addCoordinateRowBack(adjustedSplitStringRow);

        position = "front"; 
    }

    return newAdjustedSplitStringRow;

}

void printCoordinateRow() {

    for(int i = 0; i < newAdjustedSplitStringRow.numberOfElements; i++) {

        out.printf("%d, %d\n", newAdjustedSplitStringRow.newCoordinateArray[i].coordinateX, newAdjustedSplitStringRow.newCoordinateArray[i].coordinateY);           
    }

}

Stack trace:

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.nextInt(Scanner.java:2258)
    at java.base/java.util.Scanner.nextInt(Scanner.java:2212)
    at Pirate.Pirate.convertCoordinates(Pirate.java:81)
    at Pirate.Pirate.splitLineString(Pirate.java:63)
    at Pirate.Pirate.start(Pirate.java:47)
    at Pirate.Pirate.main(Pirate.java:257)

Output I am getting:

Output I should be getting

6,5
8,8
7,5
7,4
8,6
6,4
5,5
9,7
7,3
4,2
10,6
5,3
10,8

I'm not sure what is happening.

Please add the exception stack trace, it says why. Also, some of your global members/variables are not shown in your code. — Matthieu
– Matthieu, Commented Nov 7, 2021 at 8:39
Which line is line 81 of your program? The stack trace says it tries to read an int there but can’t. — Anonymous
– Anonymous, Commented Nov 7, 2021 at 8:52

user17223316 · Accepted Answer · 2021-11-07 08:52:01Z

2

It seems that there are two types of coordinate value delimiters, commas and blanks.

You should change

splitStringArrayScanner.useDelimiter(",");

to

splitStringArrayScanner.useDelimiter(",|\\s+");

answered Nov 7, 2021 at 8:52

user17223316

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5 Comments

Weightlifting Without Limits Over a year ago

O that worked, but it seems to print out my output twice

Weightlifting Without Limits Over a year ago

This is the output I get vs what is expected. (EXPECTED) 6,5 8,8 7,5 7,4 8,6 6,4 5,5 9,7 7,3 4,2 10,6 5,3 10,8 (MINE) 6, 4 5, 5 9, 7 7, 3 4, 2 10, 6 5, 3 8, 6 10, 8 6, 5 8, 8 7, 5 7, 4 6, 4 5, 5 9, 7 7, 3 4, 2 10, 6 5, 3 8, 6 6, 4 5, 5 9, 7 6, 4 5, 5 9, 7 7, 3 4, 2 10, 6 5, 3 6, 4 5, 5 9, 7 7, 3 4, 2 10, 6 5, 3 8, 6 10, 8

Weightlifting Without Limits Over a year ago

I have re-edited my code, but I seem to be getting alot more output then i should. Any ideas?

user17223316 Over a year ago

Now your "Input Mismatch Exception problem with code" has been resolved, it's a good idea to repost it as another question.

Weightlifting Without Limits Over a year ago

Well I would if my other thread was not closed.

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