Submitting code on CodeEval site

问题

A Java program on CodeEval had to accept a file path as an argument. I used a command line argument to do this, but I get an exception as below when I submitted my code on CodeEval. What are some potential solutions to this problem?

Exception in thread "main" java.util.NoSuchElementException
    at java.util.StringTokenizer.nextToken(StringTokenizer.java:349)
    at java.util.StringTokenizer.nextElement(StringTokenizer.java:407)
    at Main.FileRead(Main.java:61)
    at Main.main(Main.java:26)

回答1:

Here's the boilerplate Java code that I use for my Codeeval code. The specific problem code generally goes in the processLine method. I don't use Scanner or StringTokenizer. I use the String split method to process the input.

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class Main implements Runnable {

    private String fileName;

    public Main (String fileName) {
        this.fileName = fileName;
    }

    @Override
    public void run() {
        try {
            processFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void processFile() throws IOException {
        BufferedReader br = new BufferedReader(
                new FileReader(fileName));
        String line = "";
        while ((line = br.readLine()) != null) {
            processLine(line);
        }
        br.close();
    }

    private void processLine(String line) {
        System.out.println(line);
    }

    public static void main(String[] args) {
        new Main(args[0]).run();
    }

}

回答2:

Firstly, Check the name of class.Class name should be 'Main'. Second you have to give all the imports in CodeEval Editor which you are using in your program.

回答3:

This happens if you don't check to see if there are any more tokens (by calling hasMoreTokens). If no more tokens exist and you call nextToken, you will get this exception. However, without seeing the rest of your code, there is no way to know what is actually happening.

来源：https://stackoverflow.com/questions/22793253/submitting-code-on-codeeval-site

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