What are the differences between member variables and local variables?

The differences are as follows:

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1. Declaration position

Local variables: in method body {}, formal parameters, code block {}

Member variables: outside methods in the class

• Class variables: with static modification

• Instance variable: no static modification

2. Modifier

Local variable: final

Member variables: public, protected, private, final, static, volatile, transient

3. Value storage location

Local variables: stack

Instance variables: heap

Class variables: method area

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4. Scope

Local variables: from declaration Start at and end at the }

Instance variable: "this." in the current class (sometimes this. can be defaulted), "object name." in other classes access

Class variable: In the current class, "class name." (sometimes the class name. can be omitted), in other classes, "class name. or "object name." Access

5, life cycle

Local variables: Each thread, each call execution is a new life cycle

Instance variables: initialized with the creation of the object, and destroyed as the object is recycled, each object Instance variables are independent

Class variables: initialized with the initialization of the class, and destroyed with the unloading of the class. The class variables of all objects of the class are shared.

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