What does this code means ? getsupportactionbar().setdisplayhomeasupenabled(true); getsupportactionbar().setdisplayshowhomeenabled(true);

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Java

Android4x

I am trying to set a tool bar inside my mainactivity to set a navigation drawer, and then came across these two lines of code.

I tried google but no specific answer.

Please explain to me what does below lines of code do :

getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);

and also what is the use of getSupportActionBar ? does it returns the toolbar ?

What I have tried:

Tried google but not straight answer for the query. Please take a look at the code and explain to me. Thank you in advance.