Variables in Java || Difference between Local, Instance and Static Variables in Java - In Details
A variable is a container which holds the value while the Java program is executed. A variable is assigned with a data type.
Watch full video for Data Types in Java - • Data Types in Java || Primitive Data Types...
0:00 - Introduction
01:49 - How to declare variables
02:42 - Types of variables
03:08 - Local variables
07:06 - Instance variables
11:11 - Static variables
A variable is a name which is associated with a value that can be changed.
For example when I write int i=10;
== here variable name is i which is associated with value 10, int is a data type that represents that this variable can hold integer values.
=== How to Declare a variable in Java ===
To declare a variable follow this syntax:
data_type variable_name = value;
=== There are three types of variables in Java: ===
1 . Local Variables
2. Instance Variables
3. Static Variables
1) Local Variables:
A variable declared inside the body of the method is called local variable. You can use this variable only within that method and the other methods in the class aren't even aware that the variable exists.
A local variable cannot be defined with "static" keyword.
2) Instance Variables:
A variable declared inside the class but outside the body of the method, is called instance variable. It is not declared as static.
It is called instance variable because its value is instance specific and is not shared among instances.
3) Static Variables:
A variable which is declared as static is called static variable. It cannot be local.
You can create a single copy of static variable and share among all the instances of the class.
Memory allocation for static variable happens only once when the class is loaded in the memory.
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