import java.io.File;


public class DirSize {
	static int Size;
	public static int CountSize(String DuongDan){
		File TepTin = new File(DuongDan);
		if (TepTin.isFile()){
			Size += TepTin.length();
		} 
		else{
			
		File[] NoiDung = TepTin.listFiles();
		for (int i = 0; i < NoiDung.length; i++) {
			CountSize(NoiDung[i].getAbsolutePath());		
		}
		}
		return Size;
	}
	
	public static void main(String[] args) {
		
		String DuongDan = "D:\\Dir\\TKHDT.rar";
		System.out.println(CountSize(DuongDan) + " Bytes");
	}
}