Java Exceptions and Programming Concepts

What is an exception in Java?

• A syntax error in the code

• A problem that interrupts the normal flow of a program during runtime

• A warning message from the compiler

• A feature to improve program performance

When does an ArithmeticException occur in Java?

• When attempting to divide a number by zero.

• When a file is not found.

• When accessing an invalid index in an array.

• When casting an object to an incompatible class.

What is a common cause of a NullPointerException?

• Accessing a file that does not exist.

• Performing an illegal arithmetic operation.

• Attempting to use a null reference as if it were a valid object.

• Casting an object to an unrelated class.

What leads to an ArrayIndexOutOfBoundsException?

• Using null in place of a valid object.

• Trying to access an array element with an invalid index.

• Dividing a number by zero.

• Casting an object to an incompatible type.

What does a FileNotFoundException signify?

• A file being accessed is missing or does not exist.

• An object is being cast to an invalid class.

• An invalid array index is being accessed.

• A null reference is being used in an operation.

When is a ClassCastException thrown?

• When attempting to use null as a valid object.

• When trying to cast an object to a class it is not an instance of.

• When an invalid array index is accessed.

• When there is an illegal arithmetic operation.

What is the purpose of the try block in Java?

• It always runs, regardless of exceptions.

• It catches the exception if one occurs.

• It places code that might throw an exception.

• It ensures a program crashes gracefully.

What does the catch block do in Java?

• It places code that might throw an exception.

• It handles an exception if it occurs in the try block.

• It runs cleanup code after the exception is handled.

• It always executes, even if there’s no exception.

What is the purpose of the finally block in Java?

• It runs code that might throw an exception.

• It handles the exception if one occurs in the try block.

• It runs regardless of whether an exception occurred, often for cleanup.

• It cancels the exception and keeps the program running normally.

In Java, what is the root class of the class hierarchy?

• Object

• String

• JFrame

• Exception