August 1999
JP219 : JAVA PROGRAMMING

QUESTION 3

Total Marks: 20 Marks

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SUGGESTED SOLUTIONS
for Question 3
(a) Define what is meant by the term exception with reference to the Java programming language.

 

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(b) Give two examples of abnormal conditions which may disturb the normal flow of program execution.

 

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(c) State the purpose of an exception class.

 

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(d) State the purpose of an error class.

 

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(e) Consider the following Java class definition :

public class OutOfRange extends Exception {
   private String reason;
   public OutOfRange(String reason) {
   this. reason = reason ;
}

public String GetReason() {
   return reason ;
  }

}

(i) Give the definition of a Java class, called MyClass which will contain a constructor function taking two integer parameters a and b, and a String returning function Foo, which is capable of throwing an exception of type OutOfRange.

(ii) Using the Java keyword throw, define the member function Foo such that it will throw the exception OutOfRange if and only if param is equal to or greater than limit, with the string message "parameter out of range".

(iii) Using the keyword try and catch, implement the constructor function such that it will try to ensure a is b, and will catch the exception, printing out the reason if it is not.

 

  

 

 

 

 

 

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