java search vs call hierarchy

lets say i have method called
 testSum(){
c=a+b;
}

i clicked on testSum
i did CONTROL+ALT+H i see call hierarchy results
if I clicked testSum did CONTROL+H  then i get search option with my method and its class, package selected automatically and i click SEARCH without changing anything(it says java search)

how above call hierarchy different from java search is different from previous one?

please advise
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gudii9Asked:
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girionisCommented:
Control + H is for search. You search for a string in the project/workspace. It searches for the given string anywhere in the project/workspace if you select the corresponding tab. Basically Control + H includes the call hierarchy search plus more.

Control + alt + H is for the call hierarchy. It shows you who calls your method. It only searches for the callers of your method.

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