Java Programming
Numeric variables
Declare and initialize
Variables and data types
- A variable stores a value that can change as a program executes.
- Java provides for eight primitive data types that you can use for storing values in memory.
- The int data type is used for storing integers (whole numbers).
- The double data type is used for storing numbers that can have one or more decimal places.
How to declare and initialize variables
- To initialize a variable, you declare a data type and assign an initial value to the variable.
- An assignment statement assigns a value to a variable. This value can be a literal value, another variable, or an expression.
- If a variable has already been declared, the assignment statement doesn't include the data type of the variable.
Naming recommendations for variables
- Start variable names with a lowercase letter and capitalize the first letter in all words after the first word.
- Each variable name should be a noun or a noun preceded by one or more adjectives.
- Try to use meaningful names that are easy to remember.