Java Custom exception

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Custom exception:

 

You can define your own exception also. These exceptions are known as custom exceptions.

Note:
1. For writing custom-checked exceptions, extend the Exception class.
2. For writing custom unchecked exceptions, extend the RuntimeException class.

Java Custom Exception Example

 

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

class Test{
	public void display() throws MyException {
	  throw new MyException("This is a custom exception.");
	}
}

public class CustomExceptionExample {
	public static void main(String args[]){
		//creating Test object.
		Test obj = new Test();
		
		//method call.
		try{
			obj.display();
		}catch(Exception e){
			System.out.println(e);
		}
	}
}

Output

com.w3schools.business.MyException: This is a custom exception.