Java Exception Handling - II
- 1.
Which of the following are true about Exceptions in the Java language?
- A.
They are only thrown when a user makes a mistake while using your program
- B.
All types of exceptions are instances of the same single class
- C.
They must be caught or declared to be thrown by your methods
- D.
Compiler helps with all types of exceptions
Correct Answer
C. They must be caught or declared to be thrown by your methodsExplanation
Exceptions in Java are implemented as objects and must be either caught or thrown by your methods when you call a method that can throw Exceptions. Exceptions can be instances of many different classes e.g. IOException, SQLException, NullPointerException.Rate this question:
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- 2.
There is a problem in the syntax of the regular expression pattern you have written. What exception will be thrown?
- A.
IncorrectRegExPatternException
- B.
IncorrectPatternException
- C.
InvalidPattternException
- D.
PatternSyntaxException
Correct Answer
D. PatternSyntaxExceptionExplanation
The correct answer is PatternSyntaxException. This exception is thrown when there is a problem in the syntax of a regular expression pattern. It indicates that the pattern is invalid or contains errors that prevent it from being parsed correctly.Rate this question:
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- 3.
When handling exceptions within programs why might a programmer define multiple catch blocks for a single try block?
- A.
Programs will not compile unless at least two catch blocks are defined
- B.
Try blocks do not allow multiple catch blocks to be defined
- C.
To handle different kinds of Exceptions in different ways
- D.
To demonstrate their advanced coding ability
Correct Answer
C. To handle different kinds of Exceptions in different waysExplanation
When handling exceptions within programs, a programmer might define multiple catch blocks for a single try block to handle different kinds of exceptions in different ways. By having multiple catch blocks, the programmer can specify different exception types and provide specific handling for each type of exception. This allows for more precise and tailored error handling, improving the robustness and reliability of the program.Rate this question:
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- 4.
In case of multiple catch blocks in a Java program
- A.
The superclass exception is caught first
- B.
The superclass exception is not caught first
- C.
The most specific exception to the error is caught first
- D.
None of these
Correct Answer(s)
B. The superclass exception is not caught first
C. The most specific exception to the error is caught firstExplanation
In case of multiple catch blocks in a Java program, the most specific exception to the error is caught first. This means that if there are multiple catch blocks for different exceptions, the catch block for the exception that is the most specific will be executed first. This is because Java follows an inheritance hierarchy for exceptions, where more specific exceptions are subclasses of more general exceptions. Therefore, if an exception occurs, Java will try to find the catch block that matches the most specific exception type before moving on to more general catch blocks.Rate this question:
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- 5.
Is the following code legal? try { } finally { }
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
Yes, it's legal — and very useful A try statement does not have to have a catch block if it has a finally block. If the code in the try statement has multiple exit points and no associated catch clauses, the code in the finally block is executed no matter how the try block is exited. Thus it makes sense to provide a finally block whenever there is code that must always be executed. This include resource recovery code, such as the code to close I/O streams.Rate this question:
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- 6.
Will this code compile? try { } catch (Exception e) { } catch (ArithmeticException a) { }
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
This first handler catches exceptions of type Exception; therefore, it catches any exception, including ArithmeticException. The second handler could never be reached. This code will not compile.Rate this question:
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