To answer this question, let's go through the code step by step:
- We start by executing the
main
method in the Hawk
class.
- The first line in the
main
method is System.out.print("pre ");
, which prints "pre ".
- The next line is
new Hawk();
, which creates a new instance of the Hawk
class.
- Since
Hawk
extends Raptor
, which extends Bird
, the first thing that happens when we create a new instance of Hawk
is the execution of the Bird
constructor.
- The
Bird
constructor contains an instance initializer block, which prints "bl ".
- Then, the
Bird
constructor itself prints "b2 ".
- After the
Bird
constructor is executed, we move on to the Raptor
constructor.
- Before the
Raptor
constructor, there is a static initializer block, which prints "r1 ".
- Then, the
Raptor
constructor itself prints "r2 ".
- Next, there is another instance initializer block in the
Raptor
class, which prints "r3 ".
- Finally, there is another static initializer block in the
Raptor
class, which prints "r4 ".
- After the
Raptor
constructor is executed, we move back to the Hawk
constructor.
- Since there are no instance initializer blocks in the
Hawk
class, we move directly to the Hawk
constructor, which does not contain any print statements.
- After the
Hawk
constructor is executed, we go back to the main
method.
- The last line in the
main
method is System.out.println("hawk ");
, which prints "hawk ".
Based on the above explanation, the result will be:
D. r1 r4 pre b1 b2 r3 r2 hawk