Boxing and unboxing in java

#1. What is boxing? What is unboxing?

Boxing: The process of converting a basic type into a wrapper type.

Unboxing: The process of converting a wrapper type into a basic type.

Online learning video sharing: java online tutorial

2. What is the execution process of boxing and unboxing

Boxing is achieved by calling the valueOf method of the wrapper class;

Unboxing is achieved by calling the xxxValue method of the wrapper class, xxx represents the corresponding basic data type.

For example: the valueOf(int) method of Integer is automatically called when int is boxed; Integer is automatically called when unboxing##intValue method of #Integer.

3. Frequently Asked Questions

(1) Integer packaging class

valueOf When the method returns an object, within the commonly used value range, The cache object will be returned.

(2) Floating-point wrapper class

valueOf method returns a new object.

(3) Boolean wrapper class

valueOf method BooleanStatic constant of class TRUE | FALSE.

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