Exceptions

Question 1

Exception

Answer 1

an exception is an event that alters program flow

Question 2

Error

Answer 2

Error means something went so horribly wrong that your program should not attempt to recover from it.

Question 3

RuntimeException

Answer 3

Runtime exceptions tend to be unexpected but not necessarily fatal.

For example, accessing an invalid array index is unexpected.
Runtime exceptions are also known as unchecked exceptions.

Question 4

Checked exception

Answer 4

A checked exception includes Exception and all subclasses that do not extend RuntimeException.

Question 5

Runtime Exceptions

Answer 5

ArithmeticException
ArrayIndexOutOfBoundsException
ClassCastException
IllegalArgumentException
NullPointerException
NumberFormatException

Question 6

Checked Exceptions

Answer 6

FileNotFoundException

IOException

Question 7

Errors

Answer 7

ExceptionInInitializerError
StackOverflowError
NoClassDefFoundError

Question 8

ArithmeticException

Answer 8

Thrown by the JVM when code attempts to divide by zero

Question 9

ArrayIndexOutOfBoundsException

Answer 9

Thrown by the JVM when code uses an illegal

index to access an array

Question 10

ClassCastException

Answer 10

Thrown by the JVM when an attempt is made to cast an exception to a subclass of which it is not an instance

Question 11

IllegalArgumentException

Answer 11

Thrown by the programmer to indicate that a method has been passed an illegal or inappropriate argument

Question 12

NullPointerException

Answer 12

Thrown by the JVM when there is a null reference where an object is required

Question 13

NumberFormatException

Answer 13

Thrown by the programmer when an attempt is made to convert a string to a numeric type but the string doesn’t have an appropriate format

Question 14

FileNotFoundException

Answer 14

Thrown programmatically when code tries to reference a file that does not exist

Question 15

IOException

Answer 15

Thrown programmatically when there’s a problem reading or writing a file

Question 16

ExceptionInInitializerError

Answer 16

Thrown by the JVM when a static initializer throws

an exception and doesn’t handle it

Question 17

StackOverflowError

Answer 17

Thrown by the JVM when a method calls itself too many times (this is called infnite recursion because the method typically calls itself without end)

Question 18

NoClassDefFoundError

Answer 18

Thrown by the JVM when a class that the code uses is available at compile time but not runtime