help needed in makin GUI (in netbeans) for a maths program(with lots of loops).

[F Boomboom]

hey i'm new in java. i need to make GUI for my program but i'm confused as to what to wirte in GUI codes and what to write in Main codes etc. could someone please help me?

mathprogram.java main class

public class mathprogram {
    public  static void main (String[] args){

         addition add = new addition();
         random ran = new random();
         subtraction sub=new subtraction();
         multiplication mult=new multiplication();
         division divide=new division();
         mathmenu mm=new mathmenu();
         mm.setVisible(true);
            
        
        int grade = 1;
        int equation = 10;
        int equationtype;
        int range1 = 0;
        int range2 = 0;
        int question1;
        int question2;
        int questionAnswer = 0;
        int answer = 0;
        int totalCorrect = 0;

         Scanner scanner = new Scanner(System.in);
        boolean menu = true;

        while (menu) {
            try {
                System.out.println("What is your grade: ");
                grade = scanner.nextInt();
            } catch (Exception ex) {
                System.out.println("Incorrect grade. Please re-enter.\n");
                continue;
            }
            if (grade < 1 || grade > 6) {
                System.out.println("Incorrect grade. Please re-enter.\n");
            } else {
                menu = false;
            }
            switch (grade) {
                case 1:
                    range1 = 1;
                    range2 = 20;
                    break;
                case 2:
                    range1 = 1;
                    range2 = 50;
                    break;
                case 3:
                    range1 = 10;
                    range2 = 50;
                    break;
                case 4:
                    range1 = 10;
                    range2 = 100;
                    break;
                case 5:
                    range1 = 50;
                    range2 = 100;
                    break;
                case 6:
                    range1 = 100;
                    range2 = 500;
                    break;//is used to break the loop or the block of statemnt
            }
        }
        menu = true;

        while (menu) {
            try {
                System.out.println("How many equations you want to solve? (10, 20, 30 or 50): ");
                equation = scanner.nextInt();
            } catch (Exception ex) {
                System.out.println("Incorrect numbers. Please re-enter.\n");
                continue;
            }
            switch (equation) {
                case 10:
                case 20:
                case 30:
                case 50:
                    menu = false;
                    break;
                default:
                    System.out.println("Incorrect numbers. Please re-enter.\n");
            }
        }
         menu = true;
    System.out.println("wat do u want to solve ure equations in?:\n 1.addition\n 2.substraction\n 3.multiplication\n 4.dividion");
  equationtype=scanner.nextInt();
        for (int i = 0; i < equation; i++) {
            System.out.println("Question " + (i + 1));
            question1 = ran.random(range1, range2);
            question2 = ran.random(range1, range2);

    if (equationtype==1){
            System.out.println(question1 + " + " + question2);
            questionAnswer = add.addition(question1, question2);
            }
            else if(equationtype==2){
            System.out.println(question1 + " - " + question2);
            questionAnswer = sub.subtraction(question1, question2);
            }
            else if(equationtype==3){
                System.out.println(question1 + " * " + question2);
            questionAnswer = mult.multiplication(question1, question2);
            }
            else if(equationtype==4){
                System.out.println(question1 + " / " + question2);
            questionAnswer = divide.division(question1, question2);
            }
            else{
                System.out.println("Incorect");
    }
            menu = true;
            while (menu) {
                try {
                    System.out.print("Your answer: ");
                    answer = scanner.nextInt();
                } catch (Exception ex) {
                    System.out.println("Incorrect answer. Please re-enter.\n");
                    continue;
                }
                if (answer == questionAnswer) {
                    System.out.println("Correct!\n");
                    totalCorrect++;
                } else {
                    System.out.println("Wrong!\n");
                }
                menu = false;
            }
            }
        System.out.println("Total Questions: " + equation);
        System.out.println("Total Corrects: " + totalCorrect);
        System.out.println("Total Wrongs: " + (equation-totalCorrec
            }
    }

random.java class

import java.util.Random;
public class random {
    public int random(int ran1, int ran2) {
        Random random = new Random();
        return random.nextInt(ran2-ran1+1) + ran1;
    }
}

addition.java class

public class addition {
    public int addition(int num1, int num2) {
        return num1+num2;
    }
}

subtraction.java class

public class subtraction {
public int subtraction (int num3, int num4){
return  num3 -num4;
}
}

multiplication.java class

public class multiplication {
 public int multiplication(int num5, int num6) {
        return num5*num6;
    }
}

division.java class

public class division {
 public int division(int num7, int num8) {
        return num7/num8;
    }
}

mathmenu.java guiclass(i just started learning about gui like literally yesterday, all i know is how to design the GUI and how to let the user key in- im confused how to code in this class, and am i supose to write all the loops here instead of the mathprogram.java(main class). could someone show me how to do it?

public class mathmenu extends javax.swing.JFrame {
    public mathmenu() {
        initComponents();
    }
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jTabbedPane1 = new javax.swing.JTabbedPane();
        jPanel1 = new javax.swing.JPanel();
        questionlabel1 = new javax.swing.JLabel();
        answer3 = new javax.swing.JTextField();
        questionlabel2 = new javax.swing.JLabel();
        answer2 = new javax.swing.JTextField();
        questionlabel3 = new javax.swing.JLabel();
        answer1 = new javax.swing.JTextField();
        jPanel2 = new javax.swing.JPanel();
        jPanel3 = new javax.swing.JPanel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        questionlabel1.setText("wat grade do u study in?");

        answer3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                answer3ActionPerformed(evt);
            }
        });

        questionlabel2.setText("how many questions do u wish to solve:10, 20, 30,50?");

        answer2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                answer2ActionPerformed(evt);
            }
        });

        questionlabel3.setText("watdo u wish to  use while solving equation:+ - * /");

        answer1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                answer1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(questionlabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 187, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(answer3, javax.swing.GroupLayout.PREFERRED_SIZE, 368, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addContainerGap(97, Short.MAX_VALUE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(questionlabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addGap(89, 89, 89))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(answer2, javax.swing.GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE)
                        .addGap(89, 89, 89))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(questionlabel3)
                        .addContainerGap(115, Short.MAX_VALUE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(answer1, javax.swing.GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE)
                        .addGap(89, 89, 89))))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(questionlabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(answer3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(questionlabel2)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(answer2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(questionlabel3)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(answer1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(23, Short.MAX_VALUE))
        );

        jTabbedPane1.addTab("tab1", jPanel1);

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 477, Short.MAX_VALUE)
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 227, Short.MAX_VALUE)
        );

        jTabbedPane1.addTab("tab2", jPanel2);

        javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
        jPanel3.setLayout(jPanel3Layout);
        jPanel3Layout.setHorizontalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 477, Short.MAX_VALUE)
        );
        jPanel3Layout.setVerticalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 227, Short.MAX_VALUE)
        );

        jTabbedPane1.addTab("tab3", jPanel3);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jTabbedPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 485, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(400, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(46, 46, 46)
                .addComponent(jTabbedPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 265, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(36, Short.MAX_VALUE))
        );
        pack();
    }

    private void answer3ActionPerformed(java.awt.event.ActionEvent evt) {
     try{
        int grade= Integer.parseInt(
                this.answer3.getText());
    }
   catch(Exception ex){
    JOptionPane.showMessageDialog(this, "error!-wrong option", null,  JOptionPane.ERROR_MESSAGE);
  return;
    }
    }
     private void answer2ActionPerformed(java.awt.event.ActionEvent evt) {
         try{
        int question= Integer.parseInt(
                this.answer2.getText());
    }
   catch(Exception ex){
    JOptionPane.showMessageDialog(this, "error!-wrong option", null,  JOptionPane.ERROR_MESSAGE);
  return;
    }
     }

     private void answer1ActionPerformed(java.awt.event.ActionEvent evt) {
    try{
        int grade= Integer.parseInt(
                this.answer1.getText());
    }
   catch(Exception ex){
    JOptionPane.showMessageDialog(this, "error!-wrong option", null,  JOptionPane.ERROR_MESSAGE);
  return;
    }
     }
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new mathmenu().setVisible(true);
            }
        });
    }
    private javax.swing.JTextField answer1;
    private javax.swing.JTextField answer2;
    private javax.swing.JTextField answer3;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JTabbedPane jTabbedPane1;
    private javax.swing.JLabel questionlabel1;
    private javax.swing.JLabel questionlabel2;
    private javax.swing.JLabel questionlabel3;

}

[Greg Brannon]

Cross posted in DIC.

[Ashutosh M Kulkarni]

First of all, welcome to the Ranch and the fascinating world of Java.

About your JFrame class, it pretty much looks like you have posted the code of a frame that you designed in NetBeans (or similar IDE). The whole code in initComponents() method declaration is auto-generated. Since you are providing the user with a Swing interface, it's only recommended to use the frame itself for coding rather than having a separate class.
With an IDE such as NetBeans, it's quite easy to do this. All you need to do is just use the GUI design mode and use the components context menus.

For example, consider you have a Frame named myFrame, in which you have few textfields and a Submit and a Cancel button. Your aim would to be close/kill the window on clicking "Cancel". For this, in design mode, you just right-click the "Cancel" button and go to
Events-> action -> actionPerformed.
When you click on actionPerformed, you will be taken to source code and a method will be readily created of the form

public void <button-name>ActionPerformed(){
  //TO-DO Your code goes here
}

Now all you need to do here is, write this in your method.

public void <button-name>ActionPerformed(){
    myFrame.dispose();
}

Also, this could help you a lot in what you wish to do. This should give you a basic idea... Keep digging in.
http://java.sun.com/developer/technicalArticles/tools/nb_guibuilder/

Also, if possible, please post a screenshot of your frame here so it would help others to assist you better.

Cheers,
Ashutosh.