private

In this chapter you will learn:

Use Properties to get and set private member variable
private static and const Fields
Using Methods to change private fields

Use private access modifiers

using System;//  j a va2s.co m

class Circle{
    private int radius;
    
    public int Radius{
        get{
            return(radius);
        }
        set{
            radius = value;
        }
    }

}
class MainClass
{
    public static void Main()
    {
        Circle c = new Circle();
        c.Radius = 35;
    }
}

private static and const Fields

using System;/*  j  a v a2 s. c  om*/

class MainClass
{
    static void Main(string[] args)
    {
        MyTV tv = new MyTV();
    }
}
public class MyTV
{
    public MyTV()
    {
        channel = 2;
    }
    private static int channel = 2;
    private const int maxChannels = 200;
}

Using Methods to change private fields

The private field can only be changed through methods in the same class. The following code shows how to update private fields through methods.

using System;//from  j  ava 2 s .c o  m

class Class1
{
  static void Main(string[] args)
  {
        MyCar car = new MyCar();
        int refChan = 0;
    int chan = 0;

        car.GetSpeed( chan );
        car.GetSpeed( ref refChan );
  }
}
public class MyCar
{
       private static int speed = 2;
       private const int maxSpeed = 200;
       
       public bool ChangeSpeed(int newSpeed)
       {
           if( newSpeed > maxSpeed )
               return false;

           speed = newSpeed;

           return true;
       }
       public void GetSpeed( int param )
       {
           param = speed;
       }

       public void GetSpeed( ref int param )
       {
           param = speed;
       }
}