Constants Constants are declared with keyword final. Their values cannot be changed during program execution. For example:
final double PI = 3.1415926; // Need to initialize
A final local variable that has been declared but not yet initialized is called a blank final.
A variable is used to store a piece of data for processing. It is called variable because you can change the value stored.
A variable is a named storage location, which stores a value of a particular data type. In other words, a variable has a name, a type and stores a value of that type.
A variable has a type. A variable can store a value of that particular type.
int x = 100;
short y = 5;
float z = 365.24;
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