字符串索引超出界限異常錯誤
[英]String index out of Bounds Exception error
問題描述
我正在編寫一個程序來讀取.java文件，並從中提取所有注釋，並將其寫入html文件。 該文件主要工作，但是我在提取每個方法的名稱時遇到了麻煩，因為它混淆了“ Exception {”作為單獨的類/方法。
到目前為止，這是我擁有的代碼，我相信它已經完成了。
public class ParseDoc {
static String fileName = null;
static String outputR = "";
static String inputR = "";
static String[] lines;
static String [] classnames;
static StringBuilder classn = new StringBuilder();
static String classnam = "";
/**
* This Method asks the user for path to input and output file
* then it reads the file and places it on a string for easier sorting.
* The string is sorted line by line into an array and cleaned.
* @return Array of DOC comments
* @throws Exception
*/
public static String[] scanread() throws Exception{
System.out.println("NOTICE: If a valid file path is not entered, the program will not return a DOCHTML document.");
Scanner inputReader = new Scanner(System.in);
System.out.println("Please enter path to input file (ex: C:/Program Files/Code.java : " );
inputR = inputReader.nextLine();
System.out.println("Please enter path to html output file (ex: C:/Program Files/Output.html : " );
outputR = inputReader.nextLine();
inputReader.close();
FileReader file = new FileReader(inputR);
BufferedReader reader = new BufferedReader(file);
String line = reader.readLine();
//NAME OF THE SOURCE FILE
int index = inputR.lastIndexOf("/");
fileName = inputR.substring(index + 1);
int z = 0;
//This loop turns the input file into an String for easier access
while (line!= null){
line = reader.readLine();
z += 1;
}
reader.close();
file.close();
FileReader file2 = new FileReader(inputR);
BufferedReader reader2 = new BufferedReader(file2);
String line2 = reader2.readLine();
lines = new String[z];
int j = 0;
while(line2 != null)
{
line2 = line2.trim();
lines[j] = line2;
line2 = reader2.readLine();
j += 1;
}
reader2.close();
file2.close();
return lines;
}
/**
* Removes all the comments from the Array containing strings
* @param lines contains strings made of input file
* @return Array with removed strings
*/
public static String[] removeComments(String[] lines){
for (int i=0; i <lines.length;i++){
if (lines[i].startsWith("//"))
{
lines[i]="";
}
}
return lines;
}
/**
* This method scans the entire code for name of the classes and methods
* along with their parameters and stores them in an Array for further use
* @param lines
* @return lines array without changing any content
*/
public static String[] classNames(String[] lines)
{
int total = 0;
String[] matches = new String[] {"public ", "class ","private "};
for(int b = 0; b <lines.length;b++)
{
Matcher num = Pattern.compile("\\S+\\s*\\(([^)]*)\\)").matcher(lines[b]);
for (int n = 0; n < 3 ;n++)
{
if (lines[b].contains(matches[n]))
{
while(num.find())
{
total += 1;
}
}
}
}
classnames = new String[total];
for(int z = 0; z<lines.length;z++)
{
Matcher mzz = Pattern.compile("\\w+\\s*\\{").matcher(lines[z]);
for (int k = 0; k < 3; k++)
{
if (lines[z].contains(matches[k])&& !(lines[z].contains("throws "))) //&& !(lines[z].contains("throws "))
{
while(mzz.find())
{
classn.append( mzz.group()+"break");
}
}
}
}
for(int z = 0; z <lines.length;z++)
{
//This matcher with Regex looks for class/method names along with any parameters inside
Matcher m = Pattern.compile("\\S+\\s*\\(([^)]*)\\)").matcher(lines[z]);
int i = 0;
for (int k = 0; k < 3; k++)
{
if (lines[z].contains(matches[k]) )
{
while(m.find())
{
classn.append( m.group()+"break");
continue;
}
}
}
}
classnam = classn.toString();
classnames = classnam.split("break");
/*for(int step = 0; step<classnames.length;step++)
{
System.out.println(classnames[step]);
}*/
return lines;
}
/**
* This method removes all the code from the Array and leaves on the
* Doc comments intact.
* @param lines
* @return lines array with only comments remaining ( code is removed )
*/
public static String[] removeCode(String[] lines)
{
int rep = 0;
while ( rep <lines.length){
lines[rep] = lines[rep].replaceAll("\\*", "Z");
if(!(lines[rep].startsWith("Z") || (lines[rep].startsWith("/")))){
lines[rep]="";
}
lines[rep] = lines[rep].replaceAll("Z", "\\*");
rep += 1;
}
for(int num = 0; num <lines.length; num++)
{
if(lines[num].isEmpty()){
lines[num] = null;
}
}
return lines;
}
/**
* This method removes the remaining stars, slashes and properly formats each comment
* before printing it.
* @param lines The array contains parsed Java Doc comments
* @return
* @throws Exception
*/
public static String[] writeTo(String[] lines) throws Exception
{
BufferedWriter outputWriter = null;
outputWriter = new BufferedWriter(new FileWriter(outputR));
StringBuilder writeTo = new StringBuilder();
writeTo.append("<html>\n<body>\n<h2><mark> JAVA DOC COMMENTS</mark> </h2>\n<pre>\n"
+"<big><b>Source File:</b> </big>" +"<big>"+ fileName+"</big>" + "\n\n");
for(int step = 0; step<lines.length;step++)
{
if(!(lines[step] == null))
{
lines[step] = lines[step].replace("@author", "<b>Author: </b>\n   ");
lines[step] = lines[step].replace("@since", "<b>Since: </b>\n   ");
lines[step] = lines[step].replace("@version", "<b>Version: </b>\n   ");
lines[step] = lines[step].replace("@param", "<b>Parameter: </b>\n   ");
lines[step] = lines[step].replace("@return", "<b>Return: </b>\n   ");
//lines[step] = lines[step].replace("*", "");
}
}
outputWriter.write(writeTo.toString());
//write to HTML
int countz = 0;
int comcount = 0;
//classnames[]
for(int resum = 0; resum<lines.length;resum++)
{
if(lines[resum] != null)
{
if( lines[resum].charAt(0) == '*' )
{
lines[resum] = lines[resum].replace("*","");
}
}
}
for(int i = 0; i < classnames.length; i++)
{
System.out.println(classnames[i]);
}
for(int resum = 0; resum<lines.length;resum++)
{
if(lines[resum] != null)
{
if( lines[resum].charAt(0) == '/' )
{
if(lines[resum].endsWith("*"))
{
lines[resum] = lines[resum].replace("/**","<b>"+classnames[countz]+"</b>");
countz++;
}
}
if( lines[resum].charAt(0) == '/' )
{
lines[resum] = lines[resum].replace("/","\n");
}
}
}
/*for(int resum = 0; resum<lines.length;resum++)
{
}*/
for(int f = 0; f<lines.length;f++)
{
if(lines[f] != null)
{
/*if(lines[f].startsWith("//") && lines[f].length() == 2)
{
lines[f] = "TEEEST";
countz++;
}*/
outputWriter.write(lines[f]+"\n");
}
}
outputWriter.close();
return null;
}
}
安慰：
Please enter path to input file (ex: C:/Program Files/Code.java :
I:\ICS4U0\DocParse\src\java_doc_parse\ParseDoc.java
Please enter path to html output file (ex: C:/Program Files/Output.html :
I:\ICS4U0\DocParse\src\java_doc_parse\ParseDochh.html
ParseDoc {
scanread()
removeComments(String[] lines)
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(Unknown Source)
at java_doc_parse.ParseDoc.writeTo(ParseDoc.java:285)
at java_doc_parse.Execute.main(Execute.java:14)
classNames(String[] lines)
removeCode(String[] lines)
writeTo(String[] lines)
我不確定是什么導致此錯誤。 有沒有辦法解決它，還是我應該完全放棄在注釋中添加類名？
抱歉，如果我缺少一些信息，但是我很困惑。
2 個解決方案
解決方案1
1 已采納 2015-03-23 17:46:21
該錯誤似乎是因為您在似乎是空字符串的地方調用了charAt（0）。
上面您已經有一個null檢查，我不知道它是否有效（您的行是否可以為null？），但是我會將其更改為一個長度檢查，可能與現有的null檢查結合使用。
if (lines[resum] != null && lines[resum].length > 0) {
解決方案2
0 2015-03-23 17:49:19
我認為這是您的錯誤所在：
for(int resum = 0; resum<lines.length;resum++)
{
if(lines[resum] != null)
{
if( lines[resum].charAt(0) == '/' )
{
if(lines[resum].endsWith("*"))
{
lines[resum] = lines[resum].replace("/**","<b>"+classnames[countz]+"</b>");
countz++;
}
}
if( lines[resum].charAt(0) == '/' )
{
lines[resum] = lines[resum].replace("/","\n");
}
}
}
嘗試以下操作，在進入for循環之前移動null檢查：
if(lines[0] != null)
{
for(int resum = 0; resum<lines.length;resum++)
{
if( lines[resum].charAt(0) == '/' )
{
if(lines[resum].endsWith("*"))
{
lines[resum] = lines[resum].replace("/**","<b>"+classnames[countz]+"</b>");
countz++;
}
}
if( lines[resum].charAt(0) == '/' )
{
lines[resum] = lines[resum].replace("/","\n");
}
}
}
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