10 Questions
What is the purpose of marking a method as 'throws' a particular exception?
It forces any code calling the method to handle the potential exception.
What happens if an exception occurs in a try block and none of the catch blocks match the exception type?
The current method ends and execution jumps to the calling method.
Which statement best describes the purpose of a catch block?
It defines the code to be executed if an exception occurs.
What is the relationship between Errors and Exceptions in Java?
Errors and Exceptions are both subclasses of the Throwable class.
Which type of exception is typically thrown for coding errors or invalid user input?
RuntimeException
If a method throws multiple exceptions, how can you handle them in the calling code?
Use multiple catch blocks in the order of the most specific to the most general exception types.
What is the purpose of the 'finally' block in a try-catch statement?
It executes regardless of whether an exception occurs or not.
Which statement is true about compile-time errors in Java?
They are identified by the Java compiler and prevent the program from compiling.
What is the purpose of the 'throw' statement in Java?
It is used to manually throw an exception in your code.
Which exception type is typically thrown when accessing a file or network resource?
IOException
Study Notes
Exception Handling
- Exception handling is used to handle error conditions that occur during the execution of a method.
- There are five keywords used in exception handling: try, catch, throw, throws, and finally.
What is an Exception?
- An exception is an event that occurs during the execution of a program, interrupting the normal flow of the program's instructions.
- Exceptions are generated when a recognized error condition arises during the execution of a method.
- Java includes a system for running exceptions, tracking the potential for each method to throw specific exceptions.
Types of Errors
- There are two types of errors: compile-time errors and run-time errors.
- Compile-time errors are syntax errors identified by the Java compiler during compilation.
- Run-time errors occur during the execution of a program.
Exception Handling Mechanism
- The exception handling mechanism involves try, catch, and finally blocks.
- Try block: contains the "risky" code that may throw an exception.
- Catch block: used to catch and handle the exception.
- Finally block: used to guarantee the execution of code regardless of whether an exception is thrown.
Throwing Exceptions
- There are two ways to throw an exception: using the throw statement and using the throws statement.
- The throw statement is used to explicitly throw an exception.
- The throws statement is used to declare that a method may throw an exception.
Creating and Using Your Own Exception Classes
- You can create and use your own exception classes to handle specific exceptions.
Objectives
- Learn the exception handling mechanism.
- Write try-catch structures to catch expected exceptions.
- Use finally blocks to guarantee execution of code.
- Throw/throws exceptions.
Test your knowledge on Java exception handling with this quiz covering the basics of try, catch, throw, throws, and finally. Understand how exceptions are generated and handled in Java applications. Explore the importance of error-handling to manage exceptional situations.
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