Exception Handling in JAVA 8

Exception Handling in JAVA 8

User defined Exception

You can also create your own exception subclass simply by extending java Exception class. You can define a constructor for your Exception sub class (not compulsory) and you can override the toString() function to display your customized message on catch.

Example:

class MyException extends Exception
{
 private int ex;
 MyException(int a)
 {
  ex=a;
 }
 public String toString()
 {
  return "MyException[" + ex +"] is less than zero";
 }
}

class Test
{
 static void sum(int a,int b) throws MyException
 {
  if(a<0 span="" style="color: #7f0055; font-weight: bold;">throw

new MyException(a); } else { System.out.println(a+b); } } public static void main(String[] args) { try { sum(-10, 10); } catch(MyException me) { System.out.println(me); } } } Output : MyException[-10] is less than zero

Points to Remember:

1. Extend the Exception class to create your own ecxeption class.

2. You don't have to implement anything inside it, no methods are required.

3. You can have a Constructor if you want.

4. You can override the toString() function, to display customized message.