//是否是邮箱
private boolean isEmailValid(String email) {
        //TODO: Replace this with your own logic
        return email.contains("@")&&email.contains(".");
    }
private boolean isEmailValid(String email) {
//TODO: Replace this with your own logic
return email.contains("@")&&email.contains(".");
}
private boolean isEmailValid(String email) {
//TODO: Replace this with your own logic
return email.contains("@")&&email.contains(".");
}
private boolean isEmailValid(String email) {
//TODO: Replace this with your own logic
return email.contains("@")&&email.contains(".");
}