Exception

Exception

Event that occurs during the execution of a program that disrupts the normal flow of instructions.

Exception Handling

The process used to change the normal flow of code execution if a specified exception occurs.

Checked Exceptions.

Exceptions that occur during compilation

ClassNotFoundException

The class is not found.

IllegalAccessException

Access to a class is denied.

InstantiationException

Attempt to create an object of an abstract class or an interface.

NoSuchMethodException

A requested method does not exist.

Unchecked Exceptions

Exceptions that occur during execution. These are also known as runtime exceptions.

ArithmeticException

Arithmetic error, such as an integer divided by 0

ArrayIndexOutOfBoundsException

Accessing an invalid index of the array

ArrayStoreException

Assigning a value to an array index that does not match the expected data type

InputMismatchException

Entering a value that does not match the expected data type

NullPointerException

Invalid use of a null reference

NumberFormatException

Invalid conversion of a string to a numeric format

StringIndexOutOfBoundsException

Accessing an invalid index (character) of a string

try block

A block of code that might throw an exception that can be handled by a matching catch

catch block

A segment of code that can handle an exception that might be thrown by the try block that precedes it.

getMessage()

Method can be used to determine Java’s message about the exception.

Syntax of getMessage ()

System.out.println(exceptionName.getMessage());

(1) try block

Is accepted in a program but there can be multiple catch blocks

User-defined exception

Created by extending the Exception class.

finally block

Statements which are executed whether or not an

throw statement

Sends an exception out of a block or a method so it can be handled elsewhere.