Page 173 - CTS - CSA TP - Volume 2

COMPUTER SOFTWARE APPLICATION - CITS

EXERCISE 108 : Use the “throw” and “finally” keywords
handle user defined exceptions

Objectives

At the end of this exercise you shall be able to
• develop Java programs using “throw” and “finally” keywords handle user defined exceptions.

Requirements
Tools/Materials

• PC / laptop with windows OS
• SDK software
• Test editor (Visual studio/ subline/ notepad)

Procedure

// Custom exception class

class CustomException extends Exception {
public CustomException(String message) {
super(message);
}
}

public class ThrowFinallyExample {
public static void main(String[] args) {
try {
// Simulating a condition where a custom exception is thrown
throwCustomException();

} catch (CustomException e) {
System.out.println(“Caught CustomException: “ + e.getMessage());
} finally {
// Code in the finally block will always be executed

System.out.println(“Finally block: This will execute whether an exception is thrown or not.”);
}
}

// Method that throws a custom exception
private static void throwCustomException() throws CustomException {

// Using the ‘throw’ keyword to throw a custom exception
throw new CustomException(“This is a custom exception.”);
}
}

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