Variables in Java
Variables:
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Variables are named locations in memory that are used to hold a value that may be modified by the program.
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A variable may take different values at different times during execution.
Syntax for variable declaration :
DataType IdentifierName;e.g. int a = 20;
Types of Variable :
Local Variable
Instance Variables (Non-Static Fields)
Class Variables (Static Fields)
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Local Variable :
Local variables are those variables whose scope is local to block.A variable which is declared inside the method is called local variable.
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Instance Variables (Non-Static Fields)
A non-static variable which is declared inside the class but out side of the method is instance variable.
Non-static fields are also known as instance variables because their values are unique to each instance of a class(object), mean to say that every object has its own separate copy of instance variables..
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Class Variables (Static Fields)
A static variable which is declared inside the class is class variable.
Static variable cannot be local.
Example :
class Test{ int x = 50;//instance variable static int y = 100;//static variable void my_Method(){ int z = 150;//local variable } }
Next topic is Data Types
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