对null调用成员函数hasVerifiedEmail()

public class User {
    private boolean verifiedEmail;

    public boolean hasVerifiedEmail() {
        return verifiedEmail;
    }

    public static void main(String[] args) {
        User user = null;
        if (user != null) {
            boolean isVerified = user.hasVerifiedEmail();
            System.out.println("Email verified: " + isVerified);
        } else {
            System.out.println("User is null");
        }
    }
}

class User {
    constructor(verifiedEmail) {
        this.verifiedEmail = verifiedEmail;
    }

    hasVerifiedEmail() {
        return this.verifiedEmail;
    }
}

let user = null;
if (user !== null) {
    let isVerified = user.hasVerifiedEmail();
    console.log("Email verified: " + isVerified);
} else {
    console.log("User is null");
}

class User:
    def __init__(self, verified_email):
        self.verified_email = verified_email

    def has_verified_email(self):
        return self.verified_email

user = None
if user is not None:
    is_verified = user.has_verified_email()
    print("Email verified:", is_verified)
else:
    print("User is None")