Example Analysis of variables in Java

This article will explain in detail the sample analysis of variables in Java. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Variable

Concept:

1. Is a storage area in memory

two。 The area has its own name (variable name) and type (data type)

Each variable in 3.java must be declared (defined) before using the

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

5. The variable accesses this area through the variable name

Define variable format: data type variable name = initialization value

Note:

1. Scope of variable: valid between pair {}

two。 Must have an initialization value (assign a value to the variable for the first time): for example, int I = 0; if only int m; it is wrong because the variable is not initialized

3. The = in the process of declaring a variable, unlike the mathematical =, represents an assignment in java.

Classification of variables-by data type (all but 8 basic data types are reference data types)

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