Answer:   Static block is used to initialize the static data member. It is executed before the main method, at the time of classloading.
1. class A2{
2. static{System.out.println("static block is invoked");}
3. public static void main(String args[]){
4. System.out.println("Hello main");
5. }
6. }
7. Output: static block is invoked
8. Hello main