how to hide top bar in activity android code example

Example 1: kotlin remove name from an activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    try
    {
        this.getSupportActionBar().hide();
    }
    catch (NullPointerException e){}

    setContentView(R.layout.activity_main);
}

Example 2: hide the title bar android studio

getSupportActionBar().hide();