怎么get不到testfield的值啊

Question

private void loginbutton(JFrame login) {
JPanel login1=new JPanel();//
login1.setLayout(null);

    JLabel userlabel1=new JLabel("administrator:");
    userlabel1.setBounds(60,20,80,20);
    JTextField usertext=new JTextField(10);
    usertext.setBounds(150,20,200,20);
    JLabel password=new JLabel("password:");
    password.setBounds(60,60,80,20);
    JPasswordField userpassword=new JPasswordField(10);
    userpassword.setBounds(150,60,200,20);

    //Object use=usertext.getText();
    //Object pass=userpassword.getText();

    JButton loginButton = new JButton("login");
    loginButton.setBounds(210, 340, 80, 20);
    loginButton.addActionListener(e -> {
        String url="jdbc:mysql://localhost:3306/test123?useUnicode=true"+
                "&userSSL=false&serverTimezone=GMT%2B8";
        String user="wsw";
        String pwd="123456";
        String sql="SELECT * from users";
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            Connection conn= DriverManager.getConnection(url,user,pwd);
            Statement stmt =conn.createStatement();
            ResultSet rs=stmt.executeQuery(sql);
            java.lang.System.out.println("user | pwd");
            while(rs.next()){
                String administrator=rs.getString("administrator");
                String password1 =rs.getString("password");
                java.lang.System.out.println(administrator+"|"+ password1);

                if(usertext.getText() == administrator&&userpassword.getText()== password1){
                    new System();
                }
            }
        } catch (Exception a) {
            a.printStackTrace();
        }
    }
    );

Answer 1

String 比较是否相等要用 它的 equal()方法。你的代码应该改成这样

          if(usertext.getText().equal(administrator)&&userpassword.getText().equal(password1)){
                 new System();
           }