What and How you Call a Custom Exception ?

The simple word I can say that exceptions are events. which occurs during the execution of a program and that disrupts the normal flow of a program. Here are some examples of exceptions

• Arithmetic Exception
• ArrayIndexOutOfBoundException
• ClassNotFoundException
• FileNotFoundException
• NullPointerException
• NumberFormatException

What Is a Custom Exception?

Java Provides a facility to create an exception as per their needs. so the exception is created by the users that are called a custom exception.

Check Also: Checked Exception VS Unchecked Exception In Java

package co.java.exception;
@SuppressWarnings("serial")
public class MyException extends Exception 
{
   //not compulsory
   public MyException()
   {
      super();
      System.out.println("MyException");
   }
   public String getFaultMessage()
   {
      return "U r not an adult ....";
   }
}
</pre>
<pre class="lang:default decode:true" title="Call Custom_Exception">package co.java.exception;
import java.util.Scanner;
public class CallCustomException
{
   @SuppressWarnings("resource")
   public static void main(String[] args) 
   {
      Scanner s = new Scanner(System.in);
      System.out.println("Enter age: ");
      int age = s.nextInt();
      try
      {
         if(age < 18)
         {
            throw new MyException();
         }
      }
      catch(MyException e)
      {
         System.out.println(e.getFaultMessage());
      }
      finally {
         System.out.println("finally");
      }
   }
   
}

Explanation: