How to create a Tree in a file?

I want to create a Tree in a new file, but now I only can create the new file and there is no tree in this file,like this:
This is my main code:

TFile fout("nin.root","recreate");
TTree tree("tree","p");
tree.Branch("tof1",&tof1,"tof1/F");//and other branches

I don’t know where’s the problem.

You have to Write the tree to the file (e.g. tree.Write();), or Write the file itself (e.g. fout.Write();); see examples here.

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