Java Exception Handling - II

1. When handling exceptions within programs why might a programmer define multiple catch blocks for a single try block?

Programs will not compile unless at least two catch blocks are defined

Try blocks do not allow multiple catch blocks to be defined

To handle different kinds of Exceptions in different ways

To demonstrate their advanced coding ability

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.

Explanation

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.

2. Will this code compile?

try {

} catch (Exception e) {
   
} catch (ArithmeticException a) {
    
}

Yes

No

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.

Explanation

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.

3. Which of the following are true about Exceptions in the Java language?

They are only thrown when a user makes a mistake while using your program

All types of exceptions are instances of the same single class

They must be caught or declared to be thrown by your methods

Compiler helps with all types of exceptions

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.

Explanation

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.

4. There is a problem in the syntax of the regular expression pattern you have written. What exception will be thrown?

IncorrectRegExPatternException

IncorrectPatternException

InvalidPattternException

PatternSyntaxException

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.

Explanation

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.

5. Is the following code legal?

try {
    
} finally {
   
}

Yes

No

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.

Explanation

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.

6. In case of multiple catch blocks in a Java program

The superclass exception is caught first

The superclass exception is not caught first

The most specific exception to the error is caught first

None of these

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.

Explanation

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.

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