What are variables in java

In JAVA we describe variables through three elements: variable type, variable name and variable value.

Variables are quantities that can be changed.

For example: int represents a data type that can store integer types. int a; means you have defined a variable to store an integer. a is your variable name; int a = 10; means that the value you assign to this variable is 10

Rules for using variables in Java:

1. Variables in Java need to be declared first Use later;

2. When using variables, you can initialize them while declaring them, or you can declare them first and then assign them;

String love="imooc"; or String love;love=" I love imooc";

3. Only one value can be assigned to a variable at a time, but it can be modified multiple times;

4. The variables defined in the main method must be assigned a value first before they can be output. ;

5. Although there is no error in the syntax, in actual development, it is not recommended to use Chinese for variable names, which may easily cause security risks, such as garbled characters in later cross-platform operations.

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