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java - Program won't run after a while, and I get this

问题描述

I have really messed with this one for a while now, and I can't figure it out.

I'm in the process of making an breakout game, but I keep getting this error suddenly:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1
at com.spil.Start.sortTable(Start.java:388)
at com.spil.Start.printScores(Start.java:440)
at com.spil.Start.paintComponent(Start.java:304)
at java.desktop/javax.swing.JComponent.paint(JComponent.java:1074)
at java.desktop/javax.swing.JComponent.paintToOffscreen(JComponent.java:5255)
at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBufferedImpl(RepaintManager.java:1643)
at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1618)
at java.desktop/javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1556)
at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1323)
at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5203)
at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5013)
at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:865)
at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:848)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:848)
at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:823)
at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:772)
at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1884)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:316)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Here's the code for: at com.spil.Start.sortTable(Start.java:388)

public void sortTable() throws IOException {
    File f = new File("HighScores.txt");
    File temp = new File("temp.txt");
    TreeMap<Integer, ArrayList<String>> topTen = new TreeMap<Integer, ArrayList<String>>();
    BufferedReader br = new BufferedReader(new FileReader(f.getAbsoluteFile()));
    BufferedWriter bw = new BufferedWriter(new FileWriter(temp.getAbsoluteFile()));


    String line = null;
    while ((line = br.readLine()) != null) {
        if (line.isEmpty()) {
            continue;
        }
        String[] scores = line.split("Points: ");
        Integer score = Integer.valueOf(scores[1]); //this is line 388..
        ArrayList<String> players = null;


        if ((players = topTen.get(score)) == null) {
            players = new ArrayList<String>(1);
            players.add(scores[0]);
            topTen.put(Integer.valueOf(scores[1]), players);
        }
        else {
            players.add(scores[0]);
        }

    }

    for (Integer score : topTen.descendingKeySet()) {
        for (String player : topTen.get(score)) {
            try {
                bw.append(player + "Score: " + score + "\n");
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
        }
    }
    br.close();
    bw.close();
    try {
        makeNewScoreTable();
    } catch (IOException ioe) {
        ioe.printStackTrace();
    }
}

Can someone show me what I am doing wrong or missing? It worked well before, and suddenly it gives this.

标签： javaexception

解决方案

In the following code, the line.split doesn't seem to be returning you an array of size 2 (or more as per your requirement).

String[] scores = line.split("Points: ");
Integer score = Integer.valueOf(scores[1]);

You can get rid of the issue by checking the size of the array before trying to access an element from it e.g.

String[] scores = line.split("Points: ");
Integer score;
if(scores.length >= 2) {
    score = Integer.valueOf(scores[1]);
    //...
}

However, I would recommend you to find why line.split is not returning you an array of size 2 (or more as per your requirement). You need to check the content of the file.

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