java.util.NoSuchElementException-线程“ main”错误中的异常

Question

I'm not too sure about this error as I cannot figure out what's going on. Through the debugger, I can see that the file is been successfully read, but on the last index, I get an error. Anyone know why?

try {
    txtin = new Scanner(gameFile);
    //String line;
    while(txtin.hasNext()) {
        for(int i = 0; i < 15; i++) {
            Grid[i] = txtin.next();
        }

    }
} catch (FileNotFoundException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
finally {
    if (txtin != null)
        txtin.close();
}

The error I get is:

Exception in thread "main" java.util.NoSuchElementException

How do I fix this?

Answer 1

Every time you call Iterator#next() , it moves the underlying cursor forward. You are calling txtin.next() in a for loop for 15 times. There may be a case where there are less than 15 token and the cursor went to a place that doesn't have such element Thus NoSuchElementException

Answer 2

Replace

while(txtin.hasNext()) {
  for(int i = 0; i < 15; i++) {
    Grid[i] = txtin.next();
  }
}

with

int i=0;
while(txtin.hasNext()) {
  Grid[i++] = txtin.next();
}

For the reasons described by Gagan Chouhan.