Static Constructors – What is the output of the C# code?

.Net, Interview Questions, OOPs 1 Minute
class A
{
  public A(string text)
  {
    Console.WriteLine(text);
  }
}
 
class B
{
  static A a1 = new A(“a1”);
 
  A a2 = new A(“a2”);
 
  static B()
  {
    a1 = new A(“a3”);
  }
 
  public B()
  {
    a2 = new A(“a4”);
  }
}
 
class Program
{
  static void Main(string[] args)
  {
    B b = new B();
  }
}
Before any code of the type B gets executed, its static constructor will be invoked first. It initializes static data fields and then executes statements inside the static constructor. Therefore, it prints a line of “a1”, and then another line of “a3”.
When the execution flow reaches the statement B b = new B(), the ordinary constructor is invoked. It initializes its data fields first and then the statements in its constructor method, so it prints a line of “a2”, and then another line of “a4”.
Output:
a1
a3
a2
a4

Published by Sunil Kumar

I'm working as Project Lead in Oracle. I'm mainly into Microsoft technologies but quite interested in Java and C. I'm not a professional blogger, whatever I find interesting I read it and write a blog post just to share my understanding.

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