Concatenate String and variable in JOptionPane window

Question

I have the following method in a test environment, I'm trying to attach the variable count "loginAttempts" to the JOptionPane window so the user would know how many failed login attempts they've had so far. Essentially, I want to concatenate another string and a variable to this line if possible .

JOptionPane.showMessageDialog(null, "Enter a valid username and a password. You've had ||loginAttempts|| "failed login attempts", "Error", JOptionPane.ERROR_MESSAGE);


Here's the method out of the application" 

private void loginButton(java.awt.event.ActionEvent evt) {                             
    username = userName.getText();
    password = userPassword.getText();
    if (username.equals(finalusername) && password.equals(finalpassword) && loginAttempts <= 3) {
        loginSuccess = true;
    } else {
        loginSuccess = false;
        loginAttempts = loginAttempts + 1;
    }
    if (loginSuccess) {
        JOptionPane.showMessageDialog(null, "You have successfully logged in", "Success", JOptionPane.DEFAULT_OPTION);
    } else if (loginAttempts > 3) {
        JOptionPane.showMessageDialog(null, "You have had 3 failed login attempt, your account has been locked","Locked", JOptionPane.ERROR_MESSAGE);
    } else if (!loginSuccess) {
        JOptionPane.showMessageDialog(null, "Enter a valid username and a password", "Error", JOptionPane.ERROR_MESSAGE);
    }
}

it would be like this `JOptionPane.showMessageDialog(null, "Enter a valid username and a password , failed attempts " + loginAttempts , "Error", JOptionPane.ERROR_MESSAGE);` should check this http://stackoverflow.com/questions/3753869/how-do-i-concatenate-two-strings-in-java — Dev. Joel, Oct 14 '16 at 15:03
So where is the problem? Do you not know how to concatenate strings in Java? (e.g.: using the + operator) Or what exactly are you looking for? — UnholySheep, Oct 14 '16 at 15:03
I wasn't sure if concatenation works within showMessageDialog() Dev.Joel and L.Cabonne provided the solution. — Mr.Maze, Oct 14 '16 at 15:08

score 0 · Accepted Answer · answered Oct 14 '16 at 15:03

You can concatenate this way (replace the last else with that ) :

    } else if (!loginSuccess) {
        JOptionPane.showMessageDialog(null, "Enter a valid username and a password, Number of attempts : "+loginAttempts , "Error", JOptionPane.ERROR_MESSAGE);
    }

Concatenate String and variable in JOptionPane window

1 Answers1