布尔值在这个程序中是如何工作的？

Question

public class HelloWorld{

    public static void main(String [] args){

        boolean found = false;
        inputInfo = "do";

        String temp = "yes/no/do/you";
        Scanner scan = new Scanner(temp); // caseS scanner class

        scan.useDelimiter("/"); // Delimiter

        String[] caseArray = new String[100];

        while (scan.hasNext()) {

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

                caseArray[i] = scan.next();

            }

            for(int j = 0; j< caseArray.length; j++) {

                if(caseArray[j].equals(inputInfo)) {

                     found = true;
                     break;
                }
            }

        if(found){

            System.out.print("product found");
        } else{

            System.out.print("product not found");
        }
    }
  }
}

I have a variable called temp which stores a String value, which is separated by a Delimiter("/"). I would like to go through all the elements in the String and print "product found" if the element exists and print "product not found" if the elements doesn't exists.

While running the program I got an error like:

Exception in thread "main" java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Scanner.java:862)
    at java.util.Scanner.next(Scanner.java:1371)

Could someone tell as to why this error occurs and how to correct it?

Answer 1

caseArray has a hundred elements and you're next() for each even though the string you're splitting only has four elements in it.

Since the temp string is hard coded, you don't really need a scanner there. In fact, it would be much simpler to hold it as an array or a list to begin with:

List<String> cases = Arrays.asList("yes", "no", "do", "you");
found = cases.contains(inputInfo);