Home > Java > Javagetting Started > body text

What are packaging classes? What does the packaging class do?

王林
Release: 2020-06-28 17:16:41
forward
9123 people have browsed it

What are packaging classes? What does the packaging class do?

What is a wrapper class?

(Recommended tutorial: java introductory program)

A core principle in Java design is that everything is an object, that is to say, everything must be described in the form of an object. But primitive data types are not objects. So how to solve this problem? You can wrap basic data types into an object and use these types with an object-oriented approach.

What does the packaging class do?

(Video tutorial recommendation: java video tutorial)

Use basic data type packaging to describe the function to make the function more robust, for example: Integer is not int by default 0 but null, then compared to the basic data type, the wrapper class object has one more state.

Another more intuitive thing is that the packaging class provides us with many methods to use, for example: data can be converted to binary, view the maximum and minimum values, etc.

In addition to the above, there is another important point: basic data types cannot be stored in collections, only objects, so when using collections, we need to use wrapper class objects.

The above is the detailed content of What are packaging classes? What does the packaging class do?. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:csdn.net
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template