Java custom exception class - Keys and Strokes

In this article, I am going to explain to you how to write custom exception class or user-defined exception, the custom exception class should extend from Exception, here instead of using FileNotFoundException I am using custom new ExcelFileNotFoundException class

User-defined exception:

package com.keys.examples;

public class ExcelFileNotFoundException extends Exception {

	private static final long serialVersionUID = 1L;

	public ExcelFileNotFoundException(String errorMessage) {
		super(errorMessage);

	}

}

package com.keys.examples;

public class ExcelFileNotFoundException extends Exception {

private static final long serialVersionUID = 1L;

public ExcelFileNotFoundException(String errorMessage) {

super(errorMessage);

}

Test class :

package com.keys.examples;

import java.io.IOException;

public class PDFManager {

	public PDFManager() {

	}

	public static void main(String[] args) throws IOException, Exception {
		try {
			ExcelReader.setExcelFile();
		} catch (ExcelFileNotFoundException e) {
			e.printStackTrace();
		}
	}
}

package com.keys.examples;

import java.io.IOException;

public class PDFManager {

public PDFManager() {

}

public static void main(String[] args) throws IOException, Exception {

try {

ExcelReader.setExcelFile();

} catch (ExcelFileNotFoundException e) {

e.printStackTrace();

}

Output :

About Author

Raj

A technology enthusiast and a professional blogger from India. Through out my IT career, I have had the pleasure of working on various new technologies and built products like www.ziprides.com and some other products. Unfortunately, my attempts have not given me the desired results and as a result, I have finally decided to build a professional blog where I would like to share all my learnings and hoping to learn from other enthusiasts around the world.