Definition and example analysis of variables in Java

Variable

Concept:

1. It is a storage area in memory

2. This area has its own name (variable name) and type (data type )

3. Each variable in java must be declared (defined) first, and then used

4. The data in this area can continue to change within the same type range (for example, declare int i first = 1; then declare i = 2; then the value of i changes from 1 to 2)

5. Variables access this area through variable names

Define variable format: Data type Variable name = initialization value

Note:

1. The scope of the variable: valid between a pair of { }

2. There must be an initialization value (the first time Assigning a value to a variable): For example, int i = 0; If only int m; is used directly, it is an error because the variable is not initialized

3. The = in the process of declaring a variable is different from the = in the mathematical sense, in Java Indicates assignment

Classification of variables - by data type (except for the 8 basic data types, the others are reference data types)

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