Final answer:
In Java, the keyword 'throws' is indeed used to declare exceptions in a method heading. However, not all exceptions are checked at compile-time; only checked exceptions are, while unchecked are not. A 'try' block can be followed by either a 'catch' or 'finally' block, and unchecked exceptions don't have to be explicitly caught or declared.
Step-by-step explanation:
A student has asked whether the following statements about exceptions in Java are true:
- You use the keyword 'throws' to declare exceptions in the method heading.
- Exceptions in Java are always checked at compile-time.
- The 'try' block must be followed by a 'catch' block in Java.
- Unchecked exceptions in Java must be explicitly caught or declared.
Here are the correct answers:
- The statement that you use the keyword 'throws' to declare exceptions in the method heading is true. This is how you indicate that a method might throw an exception that must be handled by the calling code.
- The statement that exceptions in Java are always checked at compile-time is false. There are two types of exceptions in Java: checked exceptions, which are checked at compile-time, and unchecked exceptions, which are not.
- The statement that the 'try' block must be followed by a 'catch' block is false. The 'try' block must be followed by either a 'catch' block or a 'finally' block, or both.
- The statement that unchecked exceptions in Java must be explicitly caught or declared is false. Unchecked exceptions, also known as runtime exceptions, do not need to be caught or declared, although it can be good practice to handle them appropriately.