Magento 2 success and error message

Today, we describe success and error messages in Magento 2.

messageManager
Display success and error messages with the help of the messageManager object .

protected messageManager;

public function __construct(
  ---------
  \Magento\Framework\Message\ManagerInterface $messageManager,
   ---------
){
 $this->messageManager = $messageManager;
}

public function myFucntion(){

  $message =$this->messageManager->addError(__("Error message"));
  $message =$this->messageManager->addWarning(__("Warning message"));
  $message =$this->messageManager->addNotice(__("Notice message"));
  $message =$this->messageManager->addSuccess(__("Success message"));
  return $message;
}

Observer
Display success and error messages with the help of the observer.

Throw exception from observer

throw new \Magento\Framework\Exception\CouldNotDeleteException(__("Prices have been changed!"));

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