Java based on file name to judge file type __java, tool class

/* AUTHOR:ZSS
* Date: March 31, 2017
* Function: According to the file name to determine the type
* Accept parameter type: String
* Return parameter type: String
* Note: The file type is not perfect, it is necessary to add
*/
public class FileType {
public string FileType (string fileName) {
if (FileName = = null) {
filename = "file name is empty. ";
return fileName;


} else {
Gets the file suffix name and converts it to write for subsequent comparisons
String FileType = filename.substring (Filename.lastindexof (".") + 1, filename.length ()). toLowerCase ();
Create an array of picture types
String img[] = {"BMP", "JPG", "JPEG", "PNG", "TIFF", "GIF", "PCX", "TGA", "Exif", "FPX", "SVG", "PSD",
"Cdr", "PCD", "DXF", "UFO", "EPS", "AI", "raw", "WMF"};
for (int i = 0; i < img.length; i++) {
if (Img[i].equals (FileType)) {
return "picture";
}
}


Creating an array of document types
String document[] = {"TXT", "Doc", "docx", "xls", "htm", "html", "JSP", "RTF", "WPD", "PDF", "ppt"};
for (int i = 0; i < document.length; i++) {
if (Document[i].equals (FileType)) {
Return "Document";
}
}
Creating an array of video types
String video[] = {"mp4", "avi", "mov", "wmv", "ASF", "Navi", "3GP", "mkv", "F4V", "rmvb", "WEBM"};
for (int i = 0; i < video.length; i++) {
if (Video[i].equals (FileType)) {
return "video";
}
}
Create an array of music types
String music[] = {"MP3", "WMA", "WAV", "mod", "RA", "CD", "MD", "ASF", "AAC", "VQF", "Ape", "mid", "Ogg",
"M4A", "VQF"};
for (int i = 0; i < music.length; i++) {
if (Music[i].equals (FileType)) {
return "Music";
}
}


}
return "other";
}
}