&&逻辑运算符不起作用，但||运营商做了[关闭]

Question

我的&&逻辑运算符将无法工作，并始终返回false并返回第二个条件为true。但它对||非常有效运营商。我做错了什么？

我尝试使用||运算符，它工作正常，但我想使用&&运算符

@FXML
private void loginFunction() throws IOException {

    String username = this.username.getText();
    String password = this.username.getText();

    if (username.equals("username") && password.equals("password")) {

        // This Code is used to alert the user of any information in case the username
        // and password is all correct
        Alert alert2 = new Alert(Alert.AlertType.CONFIRMATION);
        alert2.setHeaderText("Login Successful");
        alert2.setTitle("Welcome");
        alert2.setContentText("Pleae Wait. You shall be redirected soon.");
        alert2.show();
    } else {
        Alert alert3 = new Alert(Alert.AlertType.WARNING);
        alert3.setTitle("Intruder Found");
        alert3.setContentText("Either your username or password is incorrect. Please try again.");
        alert3.setHeaderText("Enter the Right Details");
        alert3.show();
        return;
    }
}

我希望第一个条件返回为真，但事实并非如此。对于||，情况并非如此运营商。

Answer 1

好吧

String username = this.username.getText();
String password = this. username.getText();

意味着你的两个领域是相同的。改变它，像，

String username = this.username.getText();
String password = this.password.getText();

因为username中的文本不能同时是“用户名”和“密码”。

Answer 2

更改

String password = this.username.getText();

如，

String password = this.password.getText();