10 Questions
What does the 'try' keyword specify in Java?
A block where exception code should be placed
When does the 'finally' block in Java get executed?
Whether an exception is handled or not
What is the purpose of the 'throw' keyword in Java?
To explicitly throw an exception
When does an ArrayIndexOutOfBoundsException occur in Java?
When inserting a value in the wrong index
What is recommended regarding the code within a Java 'try' block?
It should contain code that might throw an exception
What is an exception in Java?
An error that occurs during the execution of a program
How does Java handle exceptions?
By diverting control to special program blocks called exception handlers
What causes an ArithmeticException in Java?
Dividing any number by zero
When does a NullPointerException occur in Java?
Using a null value in a variable
What may cause a NumberFormatException in Java?
The wrong formatting of any value
Study Notes
Exception Handling in Java
- The 'try' keyword specifies a block of code to be tested for exceptions.
Finally Block
- The 'finally' block in Java gets executed regardless of whether an exception is thrown or not, and is used to perform cleanup code.
Throw Keyword
- The 'throw' keyword is used to explicitly throw an exception in Java.
ArrayIndexOutOfBoundsException
- An ArrayIndexOutOfBoundsException occurs in Java when an array is accessed with an index that is outside the bounds of the array.
Try Block Best Practices
- It is recommended to keep the code within a Java 'try' block as short as possible and only include the code that may throw an exception.
Exceptions in Java
- An exception in Java is an event that occurs during the execution of a program, such as runtime errors or unexpected conditions.
Exception Handling
- Java handles exceptions through a combination of try, catch, and finally blocks, which allow developers to anticipate and recover from exceptions.
ArithmeticException
- An ArithmeticException in Java is caused by invalid arithmetic operations, such as division by zero.
NullPointerException
- A NullPointerException occurs in Java when an attempt is made to access or manipulate a null object reference.
NumberFormatException
- A NumberFormatException in Java may be caused by attempting to convert a string that does not represent a valid number to a numeric value.
Test your knowledge of exception handling and file IO streams in Java with this quiz. Learn about the powerful mechanisms to handle runtime errors and how to maintain the normal flow of the application.
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