JAVA: variables

What is a variable?
A variable is like a container that holds a value.

syntax: <data type> <variable name> = <value>
eg: int i=10;
where i is an integer that holds a value of 10.

Scope of variable:

• Local Variable : its local which means its inside the method
• Instance Variable : its inside the class but outside the method.
• Class/Static Variable : its declared as static

INSTANCE VARIABLE:

• declared inside the class but outside the method.
• visible to all methods.

STATIC VARIABLE:

• declared with the static keyword in a class but outside the method.
• it is stored in static memory.

LOCAL VARIABLE:

• declared inside the method.
• are accessible only during the method execution.

Confused? let me show you an example with a program.

public class scope{

int a=10; //<----instance variable

static int c=20; //<----static variable

public static void main(String args[]){

int x=30; //<----local variable

}

}

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