TDirectory* myDir = new TDirectory("myDirectory", "My Directory");
TFile f("myfile.root", "recreate"); TTree* myTree = new TTree("myTree", "My Tree"); myDir->cd(); myTree->Write(); f.Close();
TFile f("myfile.root"); TDirectory* myDir = (TDirectory*)f.Get("myDirectory"); myDir->ls();This code opens a file called "myfile.root" and retrieves the TDirectory object "myDirectory" from it. The ls() method is then called to display the contents of the directory. The package library that TDirectory belongs to is the ROOT framework's C++ library, which is used for scientific data analysis. ROOT is an open-source software toolkit that provides a wide range of tools and libraries for analysis and visualization of large data sets.