Java StringIndexOutOfBoundsException:字符串索引超出范围:-3
当我编译和运行测试时, 出现以下消息: StringIndexOutOfBoundsException:字符串索引超出范围:-3 我想我对子字符串做了一些错误的处理,但我不知道在哪里 这应该进行测试: parsePathname的参数:.mp3 输出getAuthor:空字符串 输出getTitle:空字符串 这是我的代码:Java StringIndexOutOfBoundsException:字符串索引超出范围:-3,java,string,indexing,indexoutofboundsexception,Java,String,Indexing,Indexoutofboundsexception,当我编译和运行测试时, 出现以下消息: StringIndexOutOfBoundsException:字符串索引超出范围:-3 我想我对子字符串做了一些错误的处理,但我不知道在哪里 这应该进行测试: parsePathname的参数:.mp3 输出getAuthor:空字符串 输出getTitle:空字符串 这是我的代码: public void parseFilename(String filename) { //Dateiendung entfernen int endin
public void parseFilename(String filename)
{
//Dateiendung entfernen
int ending;
ending = filename.lastIndexOf('.');
filename = filename.substring(0,ending);
filetype = filename.substring(filename.length()-3);
//Abfrage, ob Bindestrich(hyphen) vorhanden
//i+1 ist Position vom Bindestrich
boolean has_hyphen = false;
int i;
for(i=0; i<filename.length(); i++)
{
if(filename.charAt(i) == ' ' && filename.charAt(i+1) == '-' && filename.charAt(i+2) == ' ')
{
has_hyphen = true;
break;
}
}
if (!has_hyphen || (filename.length() == 1 && filename.charAt(0) == '-'))
{
author ="";
title = filename;
}
if (filename.length() == 0 || (filename.charAt(0) == ' ' && filename.charAt(1) == '-' && filename.charAt(2) == ' '))
{
author = "";
title = "";
}
if (has_hyphen)
{
author = filename.substring(0,i);
author = author.trim();
title = filename.substring(i+2);
title = title.trim();
}
}
我猜您的例外情况发生在这里:
ending = filename.lastIndexOf('.');
filename = filename.substring(0,ending);
filetype = filename.substring(filename.length()-3); //<- Here
您应该先获取文件类型,然后再删除它以获取文件名。在这一行之后:
filename = filename.substring(0,ending);
文件名不再包含文件扩展名
filename = filename.substring(0,ending);