개체 초기화 연습

Create a Friend class

Initializing cats

Create a Dog class

Create a Circle class

Let's put together a rectangle

A programmer creates a person

Initializing objects

Your attention, please! Now recruiting code entry personnel for CodeGym. So turn up your focus, let your fingers relax, read the code, and then... type it into the appropriate box. Code entry is far from a useless exercise, though it might seem so at first glance: it allows a beginner to get used to and remember syntax (modern IDEs seldom make this possible).