java - Forked Java VM 异常退出。 JUnit 测试？

Question

我有一个简单的 Java 程序，在上传到我学校的评分系统“WebCat”之前似乎运行良好，我假设它只是在运行 JUnit。它回击的错误是:

Forked Java VM exited abnormally. Please note the time in the report does not reflect the >time until the VM exit.

我已经研究过这个问题，第一个主要的故障排除步骤似乎是查看转储日志。不幸的是，在这种情况下我不能这样做。考虑到缺乏评分系统的反馈以及缺乏编译或运行时错误，我真的不知道如何开始解决这个问题。

如果有人熟悉此错误或至少可以给我一些从哪里开始进行故障排除的方向，请引用以下代码。非常感谢!

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.io.IOException;



class PlayerApp {
    public static void showMenu()
    {
        System.out.println("Player App Menu");
        System.out.println("P - Print Report");
        System.out.println("A - Add Score");
        System.out.println("D - Delete Score");
        System.out.println("L - Find Lowest Score");
        System.out.println("H - Find Highest Score");
        System.out.println("Q - Quit");
    }
    public static void main(String[] args) throws IOException 
    {   
        if (args.length == 0)
        {
            System.out.println("File name was expected as a run argument.");
            System.out.println("Program ending.");
            System.exit(0);
        }
        String fileName = args[0];
        Scanner sc = new Scanner(System.in);
        String stnew = "";
        boolean exit = false;
        Player p = null;
        double[] scoreList;

        File dbFile = new File(fileName);
        FileInputStream fis = new FileInputStream(fileName); 
        InputStreamReader inStream = new InputStreamReader(fis); 
        BufferedReader stdin = new BufferedReader(inStream);
       String name = stdin.readLine();
       stnew = stdin.readLine();
       int numScore = Integer.parseInt(stnew);
       scoreList = new double[numScore];
       for (int i = 0; i < numScore; i++)
       {
          stnew = stdin.readLine();
          scoreList[i] = Double.parseDouble(stnew);
       }

       p = new Player(name, numScore, scoreList);

       stdin.close();

        System.out.println("File read in and Player object created.");
       showMenu();
       while (exit == false)
       {

        System.out.print("\nEnter Code [P, A, D, L, H, or Q]:");
        String choice = sc.nextLine().toLowerCase();
        if (choice.equals("p"))
        {
            System.out.println(p.toString());
        }
        else if (choice.equals("a"))
        {
            System.out.print("   Score to add: ");
            stnew = sc.nextLine();
            double scoreIn = Double.parseDouble(stnew);
            p.addScore(scoreIn);
        }
        else if (choice.equals("d"))
        {
            System.out.print("   Score to delete: ");
            stnew = sc.nextLine();
            double scoreIn = Double.parseDouble(stnew);
            p.deleteScore(scoreIn);
            System.out.println("   Score removed.");
        }
        else if (choice.equals("l"))
        {
            System.out.println("   Lowest score: " + p.findLowestScore());
        }
        else if (choice.equals("h"))
        {
            System.out.println("   Highest score: " + p.findHighestScore());
        }
        else if (choice.equals("q"))
        {
            exit = true;
        }
        }


   }
}

休息

import java.text.DecimalFormat;



public class Player {

    //Variables
    private String name;
    private int numOfScores;
    private double[] scores = new double[numOfScores];

    //Constructor
    public Player(String nameIn, int numOfScoresIn, double[] scoresIn) {
       name = nameIn;
       numOfScores = numOfScoresIn;
       scores = scoresIn;
   }

    //Methods
    public String getName() {
       return name;
    }
    public double[] getScores() {
       return scores;
    }
    public int getNumScores() {
       return numOfScores;
    }
    public String toString() {

        String res = "";
        DecimalFormat twoDForm = new DecimalFormat("#,###.0#");
      DecimalFormat twoEForm = new DecimalFormat("0.0");
        res += "   Player Name: " + name + "\n   Scores: ";
        for (int i = 0; i < numOfScores; i++)
        {
            res += twoDForm.format(scores[i]) + " ";
        }
        res += "\n   Average Score: ";
        res += twoEForm.format(this.computeAvgScore());
        return res;
    }
    public void addScore(double scoreIn) {
       double newScores[] = new double[numOfScores +1 ];
       for (int i = 0; i < numOfScores; i++)
       {
           newScores[i] = scores[i];
       }
       scores = new double[numOfScores + 1];
       for(int i = 0; i < numOfScores; i++)
       {
           scores[i] = newScores[i];
       }
       scores[numOfScores] = scoreIn;
       numOfScores++;
    }
    public boolean deleteScore(double scoreIn) {
        boolean found = false; 
        int index = 0;
        for (int i = 0; i < numOfScores; i++)
        {
           if (scores[i] == scoreIn)
            {
                found = true;
                index = i;
            }
        }
        if (found == true)
        {
            double newScores[] = new double[numOfScores -1 ];
            for (int i = 0; i < index; i++)
            {
               newScores[i] = scores[i];
            }
            for (int i = index + 1; i < numOfScores; i++)
            {
                newScores[i - 1] = scores[i];
            }
            scores = new double[numOfScores - 1];
            numOfScores--;
            for (int i = 0; i < numOfScores; i++)
            {
                scores[i] = newScores[i];
            }
            return true;
        }
        else
        {
            return false;
        }


    }
    public void increaseScoresCapacity() 
    {
        scores = new double[numOfScores + 1];
        numOfScores++;
    }
    public double findLowestScore() {
        double res = 100.0;
        for (int i = 0; i < numOfScores; i++)
        {
            if (scores[i] < res)
            {
                res = scores[i];
            }
        }
        return res;
    }
    public double findHighestScore() {
        double res = 0.0;
        for (int i = 0; i < numOfScores; i++)
        {
            if (scores[i] > res)
            {
                res = scores[i];
            }
        }
        return res;
    }
    public double computeAvgScore() {
        double res = 0.0;
      if (numOfScores > 0) {
           for (int i = 0; i < numOfScores; i++)
        {
               res += scores[i];
           }
           return res / (double)(numOfScores);
      }
      else {
         //res = 0.0;
         return res;
      }
    }

}

Answer 1

您的程序正在为某些输入调用 System.exit(0)。不要那样做!这正是消息告诉您的内容:在评分代码完成之前，JVM 在文本中间退出。不用调用 exit()，只需使用 return 尽早从 main() 返回。