Wait for process to finish before proceeding in Java -

essentially, i'm making small program that's going install software, , run basic commands afterwards prep program. however, happening program starts install, , moves on following lines (registration, updates, etc). of course, can't happen until it's installed, i'd find way of waiting on first process before running second. example,

    main.say("installing...");     process p1 = runtime.getruntime().exec(dir + "setup.exe /silent");     //wait here, need finish installing first!     main.say("registering...");     process p2 = runtime.getruntime().exec(installdir + "program.exe /register aaaa-bbbb-cccc");     main.say("updating...");     process p4 = runtime.getruntime().exec(installdir + "program.exe /update -silent"); 

call process#waitfor(). javadoc says:

causes current thread wait, if necessary, until process represented process object has terminated.

bonus: exit value of subprocess. can check whether exited code 0, or whether error occured (non-zero exit code).