如何消除索引错误超出范围异常[重复]

Question

此问题已经在这里有了答案：

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您好，我继续在if（numList.get（x）==“” && numList.get（x + 1）==“”）行中获取java.lang.IndexOutOfBoundsException。我该如何解决？

BufferedReader br = null;
        String row;
        String[] data = null;
        List<String> numList = new ArrayList<String>();

        BufferedReader csvReader = new BufferedReader(new FileReader("input file lab5.csv"));
        while ((row = csvReader.readLine()) != null) {
            data = row.split(",");
            // do something with the data

            for(int x=0; x<data.length; x++) {
                numList.add(data[x]);
            }
            numList.add(" ");
        }

        System.out.println("Make sure excel file is on src.\nNumbers extracted from file: "+numList);
        int n=0;

        for(int x=0; x<numList.size(); x++) {
            if(numList.get(x) == " " && numList.get(x+1) == " ") {
                n = x+1;
                break;

Answer 1

为最后的索引处理添加一个签入if子句（x

if (numList.get(x) == " " && x < numList.size()-1 && numList.get(x+1) == " ") {

Answer 2

在最后一个for循环中，最大的迭代器值为numList.size()，但是您引用的是x+1，因此可能要多一个。您必须降低限制：

for(int x = 0; x < numList.size() - 1; x++) {
    if(numList.get(x).equals(" ") && numList.get(x + 1).equals(" ")) {
        n = x + 1;
        break;