1, variable
1.1 What Variables are
Everything procedures are needed in terms of digital computers are a bunch of 0-1, which is the data. The variable is the name of a small container with the provisions of this container to accommodate what kind of data
1.2 categorical variables
The range of different influencing variables, and local variables divided members. Member variable is defined in an outer class method variables, local variables defined in the method or the method variables in the argument list.
2, Constant
2.1 What is constant
In the Java program fixed data.
2.2 classification, constant
Constants can be divided into integer constant decimal constants, character constants, string constants, Boolean constant, constant empty null.
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