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【 Android Development for Beginners】 Lesson 3A : Object Oriented Programming - 2

This Notes is according to the udacity free course :

Android Development for Beginners

Lesson 3A : Object Oriented Programming

Output from a method

If you want to output from a method : return value is the key point.

Review









A method has a return data type
and there will need the return message

to return the value to the upper layer-----UI

The word write behind the return data can't be reachable because the declaration were done in  "return message".

If there is no need to use return value, the method return data type is void.


Use Return Value


Define and Call a Method


 The displayMessage Method - Quiz

First Step


Second Step




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【 Android Development for Beginners】 Lesson 3A : Object Oriented Programming - 4

(I think Lesson 3A is the most important but also the most difficult part for beginner so far ) This Notes is according to the udacity free course : Android Development for Beginners Lesson 3A : Object Oriented Programming Call Method on an objects If We want to call a method on an object object variable name . method name ( input argument ); ex: titleTextView.setText("News"); You need to make sure you put a right object so you can call the method