JAVA里怎样对指定目录的文件按文件名排序

JAVA里怎样对指定目录的文件按文件名排序

public class FileUtil {
//for test
public static void main(String []args) {
File dirFile = new File("c://");

File [] sortedFiles = listSortedFiles(dirFile);
}

//list sorted files
public static File[] listSortedFiles(File dirFile) {
assert dirFile.isDirectory();

File[] files = dirFile.listFiles();

FileWrapper [] fileWrappers = new FileWrapper[files.length];
for (int i=0; i<files.length; i++) {
fileWrappers[i] = new FileWrapper(files[i]);
}

Arrays.sort(fileWrappers);

File []sortedFiles = new File[files.length];
for (int i=0; i<files.length; i++) {
sortedFiles[i] = fileWrappers[i].getFile();
}

return sortedFiles;
}
}

class FileWrapper implements Comparable {
/** File */
private File file;

public FileWrapper(File file) {
this.file = file;
}

public int compareTo(Object obj) {
assert obj instanceof FileWrapper;

FileWrapper castObj = (FileWrapper)obj;

if (this.file.getName().compareTo(castObj.getFile().getName()) > 0) {
return 1;
} else if (this.file.getName().compareTo(castObj.getFile().getName()) < 0) {
return -1;
} else {
return 0;
}
}

public File getFile() {
return this.file;
}
}