Variables
Local Variables
Any variables declared inside a method or constructor is called has local variables. Local variables need to be initialised before they are used. Local variables do not have default value.
Global Variables
Any variables declared inside the class but outside the methods or constructors are called has global variables. Global variables will take a default if u have not initialised it.
Instance variables the global variables declared without static keyword is called has instance variables. These variables get initialised whenever the object is created. Instance variables are one for the object.
Static variables the global variables declared with the static keyword are called has static variables. These variables will get initialized whenever the class loads into memory. These variables are one for the class.
An argument is an expression passed to a function or constructor, where a parameter is a reference declared in a function declaration or even constructor.
class Gift
{
void buy(String name , int cost) //name and cost r called has formal parameters
{
//some code hear
}
void Gift(double d , char c) //d and c are called has formal parameters
{
//some code
}
public static void main(String[] args)
{
double e = 5.5;
char v = ‘M’;
Gift g = new Gift(e , v); //e and v are the actual arguments
String hesaru = "barby";
int money = 200;
g.buy(hesaru , money); //hesaru and money are the actual arguments
}
}
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