we much have to sure that entered email address is valid of not and there for to check it followed method can be use

CheckEmail.java

public boolean eMailValidations(String emailstring){
        Pattern emailPattern = Pattern.compile(".+@.+\\.[a-z]+");
        Matcher emailMatcher = emailPattern.matcher(emailstring);
        return emailMatcher.matches();
}


//call method
eMailValidations("jet@jet.com");