4. Method

Summary

In this video, the presenter explains the concept of methods in programming, focusing on their use within classes. Methods are similar to functions, with the ability to accept parameters and return values. Through a hands-on example, the presenter demonstrates how to define a method, call it using an object, and use parameters and return values. The video emphasizes that methods behave like functions but are specific to objects within classes. Viewers are shown how to create, call, and test methods in a simple, step-by-step manner.

Takeaways

• 😀 A method is a function that belongs to a class in programming.
• 😀 Methods, like functions, can have parameters and return values.
• 😀 To create a method, you define it inside a class using the appropriate syntax.
• 😀 Methods can be called using an object followed by a dot (.) and the method name.
• 😀 Example: In a `Car` class, a method called `road()` can print a string when called.
• 😀 When calling a method, you use the object name and then call the method with parentheses.
• 😀 Methods can be tested by running the program to ensure they execute as expected.
• 😀 Methods can return values, just like functions. For example, a method can return a string.
• 😀 When a method returns a value, it must be printed or used to display the output.
• 😀 The behavior of methods is similar to that of functions in terms of parameters, return types, and execution.
• 😀 Understanding methods in programming is essential for organizing and structuring code within classes.

Q & A

What is the main focus of the video?

The video explains methods in programming, specifically in the context of functions within a class, how to define and use methods, and demonstrates with an example.

What is the difference between a method and a function in the context of this video?

In this video, the terms 'method' and 'function' are used interchangeably. However, the term 'method' specifically refers to a function that is part of a class.

What is the purpose of a method in a class?

A method in a class is used to define behavior for objects of that class. It can take parameters, return values, and be invoked on instances of the class.

How does the video demonstrate the creation of a method in a class?

The video shows the creation of a method called 'road' in the 'car' class, which prints 'Neng' when called. It also demonstrates how to create and invoke the method using an object of the class.

What steps did the speaker take to test the method?

The speaker copied code from a properties file, created a new file for the method, added the method definition, and then called the method using an object variable to print the output.

What is the role of the object when calling a method?

The object serves as the instance of the class, and the method is called by using the object’s name followed by a dot and the method name.

What does the 'road' method do in the car class?

The 'road' method prints the text 'Neng' when it is called from an object of the car class.

Can methods in a class have parameters or return values?

Yes, methods in a class can have parameters and return values, just like functions. The video demonstrates this with a method that returns a string.

How does the speaker add a return value to a method?

The speaker modifies the method by specifying a return type (e.g., string), and then returns a string value from the method, which is printed when called.

What is the significance of using 'void' for the 'road' method?

'Void' indicates that the method does not return any value. The 'road' method only performs an action (printing text) without returning anything.