Instance Method
class Program
{
static void Main()
{
Program p = new Program();
p.ShowMessage();
}
public void ShowMessage()
{
Console.WriteLine("Message Showed");
Console.ReadLine();
}
}
Static Method
class Program
{
static void Main()
{
Program.ShowMessage();
}
public static void ShowMessage()
{
Console.WriteLine("Message
Showed");
Console.ReadLine();
}
}
Different
- Instance method is for object instance. However Static Method is for class.
- Instance cannot call static method.
- Static Method take value is use Class Name, this is not work
- Static Method - Input given and return output (no state), regular class - input, store/maintain current state.
- Static Method - No Abstract, no inherit , no implementing as interface.
Static Variables
no matter how many objects of the class are created, there is only one copy of the static member.
class StaticVar
{
public static int num;
public void count()
{
num++;
}
public int getNum()
{
return num;
}
}
static void Main(string[] args)
{
StaticVar s1 = new StaticVar();
StaticVar s2 = new StaticVar();
s1.count();
s2.count();
Console.WriteLine("Variable num
for s1: {0}", s1.getNum()); //Variable num for s1: 2
Console.WriteLine("Variable num
for s2: {0}", s2.getNum()); //
}
Static Function
Such functions can access only static variables. The static functions exist even before the object is created.
class StaticVarMethod
{
public static int num;
public void count()
{
num++; //calling normal method, but static value change
}
public static int getNum()
{
return num;
}
}
static void Main(string[] args)
{
StaticVarMethod s = new StaticVarMethod();
s.count();
s.count();
Console.WriteLine("Variable num: {0}", StaticVarMethod.getNum()); //
}
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