The Difference Between int and Integer in Java (Primitive Data Type and Reference Data Type)

Firstly, let's talk about the difference between int and Integer

　　int is a basic data type, with a default value of 0, and does not require instantiation.

　　Integer is a reference data type, which is the encapsulation type of int, with a default value of null. An instance needs to be created for this type.

　　Basic data types can be compared using '==', while reference data types cannot, and usually the equals method is used to achieve comparison.

Secondly, let's talk about the difference between basic data types and reference data types?

Characteristics:

1From the conceptual aspect

　　Basic data type: The variable name points to the specific numerical reference. Reference data type: The variable name points to the memory address of the stored data object, that is, the variable name points to the hash value.

2From the aspect of memory construction

　　Basic data type: After the variable is declared, Java will immediately allocate memory space for it.

　　Reference data type: It points to the object entity (specific values) in a special way (similar to C pointers), and this variable does not allocate memory when declared, just storing a memory address.

3From the aspect of usage

　　Basic data type: It needs to be assigned a specific value when used, and the '==' sign is used for judgment.

　　Reference data type: It can be assigned null when used, and the equals method is used for judgment.

The above is what the editor introduces to everyone about the difference between int and Integer in Java (basic data type and reference data type), hoping it will be helpful to everyone!

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