IndexOutOfBounds异常，当指数真的是在边界

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 175, Size: 175 
    at java.util.ArrayList.rangeCheck(Unknown Source) 
    at java.util.ArrayList.remove(Unknown Source) 
    at GetData.main(GetData.java:42)

这就是我得到我的名单l上的异常，但是当我打电话l.size()，它返回188！IndexOutOfBounds异常，当指数真的是在边界

这里有一个SSCCE（当然，简明，因为我可以把它）：

import java.io.*; 
import java.util.*; 
import java.util.regex.*; 


public class GetData { 
    @SuppressWarnings("unchecked") 
    public static void main(String[] args) throws Exception { 
     //optimize(); 
     BufferedReader r = new BufferedReader(new FileReader(new File("countrydata - optimized.txt"))); 
     String str = ""; 
     String line = null; 
     int x = 0; 
     while ((line = r.readLine()) != null) { 
      str += line; 
      x ++; 
      if (x % 20 == 0) System.out.println("Reading file... // " + x/20 + " of 18"); 
     } 
     Pattern p = Pattern.compile("<strong>(.*?)</strong><br/>(.*?)<"); 
     Matcher m = p.matcher(str); 
     //PrintWriter w = new PrintWriter(new BufferedWriter(new FileWriter(new File("countrydata - verbose.xml")))); 
     //w.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); 
     ArrayList<HashMap<String, String>> l = new ArrayList<>(188); //This is one ugly line of code right here 
     HashMap<String, String> a = null; 
     String[] countries = "Afghanistan/Albania/Andorra/Angola/Antigua and Barbuda/Antigua and Barbuda 2/Argentina/Argentina 2/Australia/Astria/Azerbaijan/Bahamas/Bahrain/Bangladesh/Barbados/Barbados 2/Belgium/Belize/Benin/Bhutan/Bolivia/Bosnia and Herzegovina/Botswana/Brazil/Brunei/Bulgaria/Burkina Faso/Burundi/Cambodia/Cameroon/Canada/Cape Verde/Central African Republic/Chad/Chile/China/Colombia/Comoro Islands/Congo/Costa Rica/Cote d'Ivoire/Croatia/Cuba/Cyprus/Czech Republic/Denmark/Djibouti/Dominica/Dominican Republic/Dominican Republic 2/Ecuador/El Salvador/El Salvador 2/Eritrea/Estonia/Ethiopia/Fiji/Finland/French/Gabon/Gambia/Georgia/Germany/Ghana/Greece/Greece 2/Grenada/Guatemala/Guinea/Guinia-Bissau/Guyana/Haiti/Honduras/Hungary/Iceland/India/Indonesia/Iran/Iraq/Ireland/Israel/Italy/Jamaica/Jamaica 2/Jordan/Kazahkstan/Kenya/Kiribati/Kuwait/Kyrgyzstan/Laos/Latvia/Lebanon/Lebanon 2/Lesotho/Libya/Liechtenstein/Lithuania/Luxembourg/Macedonia/Madagascar/Malawi/Malaysia/Maldives/Mali/Mali 2/Malta/Mauritania/Mexico/Moldova/Monaco/Mongolia/Morocco/Mozambique/Myanmar/Namibia/Nepal/New Zealand/Nicaragua/Niger/North Korea/Norway/Oman/Oman 2/Panama/Papua New Guinea/Prarguay/Peru/Phillippines/Poland/Portugal/Qatar/Romania/Russia/Russia 2/St. Kitts and Nevis/St. Lucia/St. Vincent and the Grenedines/San Marino/Sao Tome and Principe/Saudi Arabia/Senegal/Seychelles/Sierra Leone/Singapore/Slovakia/Slovenia/Soloman Islands/Somalia/South Africa/South Korea/Spain/Spain 2/Sudan/Suriname/Swaziland/Sweden/Switzerland/Switzerland 2/Tawian/Tajikistan/Tanzania/Thailand/Togo/Tonga/Trinidad & Tobago/Tunisia/Turkey/Turkmenistan/Tuvalu/Uganda/Ukraine/United Arab Emirates/United Kingdom/United States/United States 2/Marshall Islands/Micronesia/Uruguay/Uzbekistan/Vanuatu/Vietnam/Samoa/Yemen/Zimbabwe/East Timor/???/Serbia".split("/"); 
     int ci = 0; 
     while (true) { 
      if (m.find()) { 
       //System.out.println((m.group(1).equals("Internet Users") ? "NEW COUNTRY\nInternet Users" : m.group(1)) + "|" + m.group(2)); 
       if (m.group(1).equals("Internet Users")) { 
        if (a != null) l.add(a); 
        if (ci == 188) break; 
        a = new HashMap<String, String>(); 
        a.put("Country Name", countries[ci++]); 
        a.put("Internet Users", m.group(2)); 
       } else { 
        a.put(m.group(1), m.group(2)); 
       } 
      } else break; 
     } 
     for (int i = 0; i < countries.length; i ++) { 
      if (countries[i].matches(".*2")) l.remove(i); 
     } 
     String[] data = "".split("\\."); 
     for (Object map : l.toArray()) { 
      a = (HashMap<String, String>) (map); 
      System.out.println(a.get("School System")); 
      System.out.println(a.get("Country Name")); 
     } 
     r.close(); 
    }

文件countrydata - optimized只是一堆形式<strong>(name of data)</strong><br/>(the data)<div id="...数据线，但是这可能不是这个问题很重要。

为什么l.size()返回188时，异常说它有175的大小？

来源

2012-11-11 Doorknob

你在哪里检查'l.size（）'？它不在你显示的代码中。哪一条是第42行？ – Eric

不要使用正则表达式来解析HTML。 –

@CoryKendall呃...我不解析HTML – Doorknob

ArrayList<HashMap<String, String>> l = new ArrayList<>(188);

188是initial capacity of the list，而不是它的大小。

你没有做肯定的，那i不会在以下超过列表的大小：

for (int i = 0; i < countries.length; i ++) { 
    if (countries[i].matches(".*2")) l.remove(i); 
}

来源

2012-11-11 21:40:54

我会在6分钟内接受这个，当SO让我。这是问题！ – Doorknob

如果(countries[i].matches(".*2"))是真实的，你从l删除元素，所以它的尺寸减小。 l的尺寸现在小于countries的尺寸，因此您不能将countries的索引映射到l，并期望获得相应的对象。

来源

2012-11-11 21:41:25 Kapep

IndexOutOfBounds异常，当指数真的是在边界

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