Create custom exception - Java Program

Q. Write a program to create custom exception in java.

Answer:

Exception class is defined in Java library. But we can also create our own exception. This example of exception, shows how to create a custom exception and use it.

CustomException.java

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


CustomDemo.java

public class CustomDemo
{
      public static void main(String args[]) throws Exception
      {
           CustomDemo custom = new CustomDemo();
           custom.display();
      }
      public void display() throws CustomException
      {
           for(int i=2;i<20;i=i+2)
           {
                 System.out.println("i= "+i);
                 if(i==8) 
                 {
                       throw new CustomException("My Exception Occurred");
                 }
           }
      }
}


Output:

custom exception
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