How to quit android application programmatically

Question

I Found some codes for quit an Android application programatically. By calling any one of the following code in onDestroy() will it quit application entirely?

Answer 1

There is no application quitting in android, SampleActivity.this.finish(); will finish the current activity.

When you switch from one activity to another keep finish the previous one

Intent homeintent = new Intent(SampleActivity.this,SecondActivity.class);
startActivity(homeintent);
SampleActivity.this.finish();