Write a problem to throw an exception

Ritendra Mall

6y972Visual Basic .NET

create a class that can have only five instances and should throw an exception if more than 5 is created ?

3 Replies

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Munib Butt6y ago
The solution is creating a class similar to a singleton pattern. However, instead of only creating and returning one class, here you would maintain a static counter and return upto 5 instances of the class. After that simply throw an exception.
Jignesh Kumar6y ago
Hey,

Please try This one, You can use loop to create instance if you want.
class MyClass
    {
        static int count = 0;
        public MyClass()
        {
            count++;
            if (count > 5)
            {
              //raise error or here you reached max number of instance creation
            }
        }
    }
    class Program
    {

        static void Main(string[] args)
        {
            MyClass obj = new MyClass();
            MyClass obj1 = new MyClass();
            MyClass obj2 = new MyClass();
            MyClass obj3 = new MyClass();
            MyClass obj4 = new MyClass();
            MyClass obj5 = new MyClass();
            MyClass obj6 = new MyClass();
         }
}
Rajanikant Hawaldar6y ago
Hello Ritendra mall,
Refer in C# and Java:
class Sample
{
   private static int i = 0;

   private Sample()
   {
   }

  public static Sample CreateInstance()
   {
      if(i <5)
      {
          i++;
          return new Sample();
      }
      else
        throw new Exception("Can not create more then 5 instance of this class");
   }
}
https://stackoverflow.com/questions/1251445/limit-instances-creation-of-a-class
https://stackoverflow.com/questions/3399191/write-a-java-class-to-have-only-five-instance-of-it-created
https://stackoverflow.com/questions/4322147/how-to-make-class-to-allow-creation-of-3-objects-only