我正在尝试使用 else if 语句来验证电子邮件，但是它会在 else if(password.isEmpty) 上抛出错误，说“else without if”

Posted 2023-04-15

【中文标题】我正在尝试使用 else if 语句来验证电子邮件，但是它会在 else if(password.isEmpty) 上抛出错误，说“else without if”

【英文标题】：I am trying an else if statement for validation email however it throws an error on else if(password.isEmpty) saying "else without if"

【发布时间】：2021-09-02 03:48:55

【问题描述】：

@覆盖 受保护的无效 onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_main);

    Tmail = findViewById(R.id.login_email);
    Tpass = findViewById(R.id.login_password);
    Tconfirmpass = findViewById(R.id.loginRetype_password);
    Bar = findViewById(R.id.bar);
    button = findViewById(R.id.signin);

    mAuth = FirebaseAuth.getInstance();
    button.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 

            String email, password, confirm;

            email = Tmail.getEditText().getText().toString().trim();
            password = Tpass.getEditText().getText().toString().trim();
            confirm = Tconfirmpass.getEditText().getText().toString().trim();

            if (email.isEmpty())
                Tmail.getEditText().setError("Field should not be empty");
                Tmail.requestFocus();
            
            else if (!Patterns.EMAIL_ADDRESS.matcher(email).matches());
                Tmail.setError("Please enter a valid email Id");
                Tmail.requestFocus();
            
           else if (password.isEmpty())
                Tpass.setError("Please enter password");
                Tpass.requestFocus();
             else if (password.length() < 6) 
                Tpass.setError("Password too short");
                Tpass.requestFocus();
             else if (!confirm.equals(password)) 
                Tconfirmpass.setError("Password mismatch");
                Tconfirmpass.requestFocus();
             else mAuth.createUserWithEmailAndPassword(email, password)
    .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() 
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) 
            if (task.isSuccessful()) 
                // Sign in success, update UI with the signed-in user's information
                Log.d(TAG, "createUserWithEmail:success");
                FirebaseUser user = mAuth.getCurrentUser();
                updateUI(user);
             else 
                // If sign in fails, display a message to the user.
                Log.w(TAG, "createUserWithEmail:failure", task.getException());
                Toast.makeText(EmailPasswordActivity.this, "Authentication failed.",
                        Toast.LENGTH_SHORT).show();
                updateUI(null);
            
        
    );

            
        
    );

【参考方案1】：

请正确格式化您的代码。

删除else if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()); 行中的分号，您应该一切顺利。