Java Learning notes-wrapper classes

Source: Internet
Author: User

Why do I need a wrapper class?

Java is not a purely object-oriented language. The Java language is an object-oriented language, but the basic data types in Java are not object-oriented. However, we often need to transform the basic data into objects in practical use, which is easy to operate. For example: The operation of the collection. At this point, we need to convert the basic type data into objects!

The wrapper classes are located in the Java.lang package, the corresponding relationship of the wrapper class and the base data type:

The role of the wrapper class:

-Provide: string, basic type of data, the way the object is converted to each other!

-Contains related attributes such as maximum, minimum, and so on for a variety of basic data types

All packaging classes (Wrapper Class) have similar methods.

Java Learning notes-wrapper classes

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