August 2000
JP219 : JAVA PROGRAMMING

QUESTION 3

Total Marks: 15 Marks

• Question 1
• Question 2
• Question 4
• Question 5
• Cover Page

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SUGGESTED SOLUTIONS
for Question 3

(a) State what is meant by an exception in a Java program, and give an example of a situation which might reasonably be expected to result in an exception. [2 marks]

(b) Define a method, called Divide, which takes as parameters two doubles, x and y. The method should first ensure that y is non zero, returning the result of dividing x by y if it is not, and throwing the relevant ArithmeticException if it is. [5 marks]

(c) Define a method, called FooBar, which will call the method Divide with the parameters a and b. Should the calling of Divide result in an exception, FooBar should indicate this by printing out the appropriate error message. If the method has attempted to call Divide, it should also print out a message stating this, regardless of success or failure. [4 marks]

(d) Declare an exception class called MyArithmeticException, which extends the standard ArithmeticException. The class should contain the member string Reason, and a constructor function which takes as a parameter a string, and initialises Reason appropriately. [4 marks]