java - How to get file path dynamically? -

i write application load other classes other folder :

public static void main(string[] args) throws exception {     string rootpath = null;     rootpath = system.getproperty("user.dir");     //system.out.println(rootpath);      file operatorfile = new file(rootpath + "business\\");     url operatorfilepath = operatorfile.tourl();     url[] operatorfilepaths = new url[]{operatorfilepath};     classloader cl = new urlclassloader(operatorfilepaths);      // plus , minus,multiply,divide classes in business folder     class[] operatorclass = new class[]{ cl.loadclass("plus"), cl.loadclass("minus"),cl.loadclass("multiply") , cl.loadclass("divide") }; 

i want dynamically business folder path(my main class in myfolder). both myfolder , business folders in drive d:\ . app dose not work because think below statement dose not correct :

file operatorfile = new file(rootpath + "business\\"); 

can me?

since have remeber points .

• where home drive pointed :system.getproperty("user.home");//either c or d whatever .

or :

 rootpath = system.getproperty("user.dir")+system.getproperty("file.separator")+"business"; 

or

  string  rootpath = system.getproperty("user.dir")+system.getproperty("file.separator")+"d"+system.getproperty("file.separator")+"myfolder";   rootpath=rootpath.replaceall("myfolder", "");//remove myfolder url   rootpath=rootpath+"business";//add business on url    system.out.println(""+rootpath);//print file path 

that return home directory business folder