java rename file extension
// java rename file extension
import java.io.File;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RenameFileExtension
{
public static boolean renameExtension(String strSource, String strNewExtension)
{
String target;
String strCurrent = findExtension(strSource);
if(strCurrent.equals(""))
{
target = strSource + "." + strNewExtension;
}
else
{
target = strSource.replaceFirst(Pattern.quote("." + strCurrent) + "$",Matcher.quoteReplacement("." + strNewExtension));
}
return new File(strSource).renameTo(new File(target));
}
public static String findExtension(String strFile)
{
String strExtension = "";
int a = strFile.lastIndexOf('.');
if(a > 0 && a < strFile.length() - 1)
{
strExtension = strFile.substring(a + 1);
}
return strExtension;
}
public static void main(String[] args) throws IOException
{
System.out.println(RenameFileExtension.renameExtension("A:\\java.txt", "pdf"));
}
}