Programming - 4 - Exceptions

Question 1

What is an Exception?

Answer 1

Indication of a problem that occurs during rpgram execution

Question 2

Example of Checked Exceptions

Answer 2

IOException

Question 3

Examples of Unchecked Exceptions

Answer 3

• ArrayIndexOutOfBoundsException when trying to access an array element with a too large index
• ArithmeticException for integer division by zero
• InputMismatchException when an inappropriate input to what expected is passed, e.g. an integer is expected from the standard input and a double or a string is passed
• NumberFormatException e.g. when trying to convert a string to an integer but the string does not have the appropriate format, “12” is ok but “1b” isn’t
• NullPointerException when trying to access an object through a null object reference

Question 4

Basic Exception Code

Answer 4

try {

//code you test on

}

catch(NumberFormatExcepion e) { //you can print the exception }

catch(ArithmeticException e) {…}