04-Default-Exception-Handler-in-Java.md

Default Exception Handler in Java

What is the Default Exception Handler?

• Java has a built-in mechanism that handles uncaught exceptions.
• If an exception is not caught by any catch block, Java's default exception handler takes over.

What does it do?

• It prints the exception name.
• It shows the message associated with the exception.
• It displays the stack trace, which tells where the exception happened.
• It terminates the program.

Example

public class DefaultExceptionHandlerExample { public static void main(String[] args) { int a = 10; int b = 0; int result = a / b; // this will cause ArithmeticException System.out.println(result); } }

Output (conceptually)

Exception in thread "main" java.lang.ArithmeticException: / by zero at DefaultExceptionHandlerExample.main(DefaultExceptionHandlerExample.java:6)

Important Point

• The default exception handler is not a replacement for proper exception handling.
• We should use try-catch to handle exceptions gracefully.

Summary

• If an exception is not handled, Java prints the error details and stops the program.
• The default exception handler is useful for debugging but not for user-friendly error management.