To analyze the given code and determine the correct statements, let's go through each option:
Option A) The try-catch block that encloses myref.test();
is mandatory for the code to compile.
This statement is correct. The test()
method in the Question20
class throws an exception. If the try-catch block is not included, the code will generate a compile-time error because the exception is not handled.
Option B) Prints: In Question20
This statement is incorrect. Since the test()
method is overridden in the Question20Sub
class, and the test()
method in Question20Sub
does not throw an exception, the code will execute the test()
method in Question20Sub
, which prints "In Question20Sub".
Option C) Prints: In Question20Sub
This statement is correct. As mentioned above, the test()
method in Question20Sub
is executed, and it prints "In Question20Sub".
Option D) Method test()
in class Question20Sub
has no obligation to declare a throws clause.
This statement is correct. The test()
method in Question20Sub
does not declare a throws
clause, indicating that it does not throw any checked exceptions. In Java, subclasses are not required to declare checked exceptions that are not declared by the superclass.
Option E) An exception is thrown at runtime.
This statement is incorrect. Although the test()
method in Question20
throws an exception, it is caught by the try-catch block in the main
method. Therefore, no exception will be thrown at runtime.
To summarize:
Option A) This option is correct because the try-catch block is mandatory for the code to compile.
Option B) This option is incorrect because it prints "In Question20Sub" instead of "In Question20".
Option C) This option is correct because it prints "In Question20Sub".
Option D) This option is correct because the test()
method in Question20Sub
has no obligation to declare a throws clause.
Option E) This option is incorrect because no exception is thrown at runtime.
The correct statements are A, C, and D.