java constants, variables, and data type

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1. Constant

Constant: it refers to the Java program in fixed data.

2. Variables and Data Types

Variable: Constant data is fixed, then the amount of change in the program can be called variables.

Java, requires a variable can only hold one data must be explicitly saved data types.

Variable definition format consists of three elements: data type, variable name, data values.

Defines all the basic data types of variables, as follows:

Variable Name: braces in the same range, the variable name can not be the same.
Variable assignment: defined variables, no assignment can not be used.