How to ask 10 random math questions for a math quiz program for kids?

Question

I am trying to create a math program for kids for a school project that asks 10 questions. I am having trouble finding out how and where to apply a loop in my code. I have tried to use for loop inside my enterbtnListener and startBtnListener but unfortunately none have work. This is the output of the program. program_OUTPUT

Here is the code of the startBtnListener

class startBtnListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        if (add.isSelected()) {
            ansBtn.setEnabled(true);
            input.setEditable(true);
            result = num1 + num2;
            question = ("What is " + num1 + " + " + num2 + " = ");

            questionTOP.setVisible(false);
            questionHERE.setText(question);
            questionHERE.setVisible(true);
            input.setVisible(true);

            add.setEnabled(false); //disables buttons until END button is clicked
            subtract.setEnabled(false);
            multiply.setEnabled(false);
            beginner.setEnabled(false);
            intermediate.setEnabled(false);
            advanced.setEnabled(false);


        } else if (subtract.isSelected()) {
            ansBtn.setEnabled(true);
            input.setEditable(true);
            result = num1 - num2;
            question = ("What is " + num1 + " - " + num2 + " = ");

            questionTOP.setVisible(false);
            questionHERE.setText(question);
            questionHERE.setVisible(true);
            input.setVisible(true);

            add.setEnabled(false); //disables buttons until END button is clicked
            subtract.setEnabled(false);
            multiply.setEnabled(false);
            beginner.setEnabled(false);
            intermediate.setEnabled(false);
            advanced.setEnabled(false);

        } else if (multiply.isSelected()) {
            ansBtn.setEnabled(true);
            input.setEditable(true);
            result = num1 * num2;
            question = ("What is " + num1 + " * " + num2 + " = ");

            questionTOP.setVisible(false);
            questionHERE.setText(question);
            questionHERE.setVisible(true);
            input.setVisible(true);

            add.setEnabled(false); //disables buttons until END button is clicked
            subtract.setEnabled(false);
            multiply.setEnabled(false);
            beginner.setEnabled(false);
            intermediate.setEnabled(false);
            advanced.setEnabled(false);

        } else {
            ansBtn.setEnabled(false);
            input.setEditable(false);
            JOptionPane.showMessageDialog(null, "You need to choose below!", "PLEASE NOTE", JOptionPane.WARNING_MESSAGE);
        }

    }
}

Here is the code of the enterBtnListener

class enterListener implements KeyListener {
    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_ENTER) {
            if (beginner.isSelected()) {
                num1 = (int) (Math.random() * 11);
                num2 = (int) (Math.random() * 11);
            } else if (intermediate.isSelected()) {
                num1 = (int) (Math.random() * 9 + 11);
                num2 = (int) (Math.random() * 9 + 11);
            } else if (advanced.isSelected()) {
                num1 = (int) (Math.random() * 17 + 13);
                num2 = (int) (Math.random() * 17 + 13);
            }

            // checking answer is correct or wrong
            while (true) {
                double doubleOfInput = Double.parseDouble(input.getText()); // getting string to double
                if (doubleOfInput == result) {
                    JOptionPane.showMessageDialog(null, "correct");
                    input.setText(" "); // clearing input after user entered answer
                    break;
                } else {
                    JOptionPane.showMessageDialog(null, "Wrong, Try Again!");
                    input.setText(" ");
                }
            }

            //generating formula
            if (add.isSelected()) {
                result = num1 + num2;
                question = ("What is " + num1 + " + " + num2 + " = ");
            } else if (subtract.isSelected()) {
                result = num1 - num2;
                question = ("What is " + num1 + " - " + num2 + " = ");
            } else if (multiply.isSelected()) {
                result = num1 * num2;
                question = ("What is " + num1 + " * " + num2 + " = ");
            } else {
                result = num1 + num2;
                question = ("What is " + num1 + " + " + num2 + " = ");
            }

            questionHERE.setText(question);//setting new question
        }

    }

I would very much appreciate if someone can help me. Thanks.

Answer 1

Looks good! My opinion would be to have a design where

1. A start button -> listener will initiate this math quiz.

2. A next button -> listener will have a iterate a class (instance level) variable and you can have it until it reaches your desired count (10 say)

3. An End button -> listener will terminate this math quiz and possibly should post the results. Possibly have this terminate and show result logic in a separate method and call here. (method name: terminateQuiz (say))

The next button whose listener will look roughly like,

class nextBtnListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
       //count++;
       //when count reaches 10 (say) it should call terminateQuiz
    }
}

All other things looks fine..

Note: Reason for Next button gives better look and feel than an enter key.

//Happy learning!

Answer 2

I am assuming your enterListener class is one which is handling ANSWER button for gui and flow is like below:

StartButton - will initialize the quiz and show the initial question Answer Button - will accept the answer entered by user and will show next button.

So your loop may go like below in enterListener

class enterListener implements KeyListener {
public void keyPressed(KeyEvent e) {
    if (e.getKeyCode() == KeyEvent.VK_ENTER) {
        if (beginner.isSelected()) {
            num1 = (int) (Math.random() * 11);
            num2 = (int) (Math.random() * 11);
        } else if (intermediate.isSelected()) {
            num1 = (int) (Math.random() * 9 + 11);
            num2 = (int) (Math.random() * 9 + 11);
        } else if (advanced.isSelected()) {
            num1 = (int) (Math.random() * 17 + 13);
            num2 = (int) (Math.random() * 17 + 13);
        }
        for(int i = 1 ; i < 10 ;i++){ //start your loop with 1 till 9 showing 9 questions as first one is already start with startbutton
            // checking answer is correct or wrong
            while (true) {
                double doubleOfInput = Double.parseDouble(input.getText()); // getting string to double
                if (doubleOfInput == result) {
                    JOptionPane.showMessageDialog(null, "correct");
                    input.setText(" "); // clearing input after user entered answer
                    break;
                } else {
                    JOptionPane.showMessageDialog(null, "Wrong, Try Again!");
                    input.setText(" ");
                }
            }

            //generating formula
            if (add.isSelected()) {
                result = num1 + num2;
                question = ("What is " + num1 + " + " + num2 + " = ");
            } else if (subtract.isSelected()) {
                result = num1 - num2;
                question = ("What is " + num1 + " - " + num2 + " = ");
            } else if (multiply.isSelected()) {
                result = num1 * num2;
                question = ("What is " + num1 + " * " + num2 + " = ");
            } else {
                result = num1 + num2;
                question = ("What is " + num1 + " + " + num2 + " = ");
            }

            questionHERE.setText(question);//setting new question
        }
    }

}