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Java Program for Static Block 

class StaticBlock  

{
  public static void main(String[] args) 

  {
    System.out.println("Main method is executed.");
  }
 
  static 

  {
    System.out.println("Static block is executed before main method.");
  }
}

class StaticBlock 

{
  public static void main(String[] args)  

  {
    System.out.println("You are using Windows operating system.");
  }
 
  static 

  {
    String os = System.getenv("OS");
    if (os.equals("Windows_NT") != true)  

    {
      System.exit(1);
    }
  }
}