What is throw keyword?

Throw keyword is used to throw the exception manually. It is mainly used when the program fails to satisfy the given condition and it wants to warn the application.The exception thrown should be subclass of Throwable.

  public void parent(){
  try{
   child();
  }catch(MyCustomException e){ }
  }


  public void child{
  String iAmMandatory=null;
   if(iAmMandatory == null){
    throw (new MyCustomException("Throwing exception using throw keyword");
   }
  }