convert this code to GUI

convert this code to GUI

import java.util.Scanner;
public class StudentGrade {
     double totalMarks;
    String grade;

    public void setTotalMarks(double totalMarks) {
        this.totalMarks = totalMarks; //"this" keyword refer to current instance of the method on which it is use
    }

    public double getTotalMarks() {
        return totalMarks;
    }

    public void setGrade(String grade) {
        this.grade = grade;//"this" keyword refer to current instance of the method on which it is use 
    }

    public String getGrade() {
        return grade;
    }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter number of students in class: ");
        int num = input.nextInt();

        StudentGrade data[] = new StudentGrade[num];
        for (int a = 0; a < data.length; a++) {
            System.out.print("Enter student programming marks: ");

            double marks = input.nextDouble();
            data[a] = new StudentGrade();
            data[a].setTotalMarks(marks);

            if (marks < 40) {
                data[a].setGrade("E");
            }

            if (marks >= 40 && marks <= 44) {
                data[a].setGrade("D");
            }

            if (marks >= 45 && marks <= 49) {
                data[a].setGrade("D+");
            }

            if (marks >= 50 && marks <= 54) {
                data[a].setGrade("C-");
            }

            if (marks >= 55 && marks <= 59) {
                data[a].setGrade("C");
            }

            if (marks >= 60 && marks <= 64) {
                data[a].setGrade("C+");
            }

            if (marks >= 65 && marks <= 69) {
                data[a].setGrade("B-");
            }

            if (marks >= 70 && marks <= 74) {
                data[a].setGrade("B");
            }

            if (marks >= 75 && marks <= 79) {
                data[a].setGrade("B+");
            }

            if (marks >= 80 && marks <= 84) {
                data[a].setGrade("A");
            }

            if (marks >= 85 && marks <= 100)
                data[a].setGrade("A+");
        }

        int grade1 = 0;
        int grade2 = 0;
        int grade3 = 0;
        int grade4 = 0;
        for (int a = 0; a < num; a++) {
            StudentGrade show = data[a];
            String i = show.getGrade();
            if (i.equals("A+")) {
                grade1++;
            }
            if (i.equals("A")) {
                grade2++;
            }
            if (i.equals("D")) {
                grade3++;
            }
            if (i.equals("E")) {
                grade4++;
            }
        }
        System.out.println("Student that getting A and A+ grade: "
         + (grade1 + grade2));

        System.out.println("Student that getting D and E grade: "
         + (grade3 + grade4));
    }
}
View Answers

November 9, 2011 at 11:16 AM

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class StudentGrade {
     double totalMarks;
    String grade;

    public void setTotalMarks(double totalMarks) {
        this.totalMarks = totalMarks;
        }

    public double getTotalMarks() {
        return totalMarks;
    }

    public void setGrade(String grade) {
        this.grade = grade;
        }

    public String getGrade() {
        return grade;
    }

    public static void main(String[] args) {
        JLabel lab=new JLabel("Enter number of students in class: ");
        final JTextField text=new JTextField(20);

        JButton b=new JButton("Find");
        lab.setBounds(10,10,150,20);
        text.setBounds(180,10,100,20);
        b.setBounds(180,40,100,20);

        JFrame f=new JFrame();
        f.setLayout(null);
        f.add(lab);
        f.add(text);
        f.add(b);
        f.setSize(300,100);
        f.setVisible(true);
        b.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){


        int num = Integer.parseInt(text.getText());
        StudentGrade data[] = new StudentGrade[num];
        for (int a = 0; a < data.length; a++) {
           String input=JOptionPane.showInputDialog(null,"Enter student programming marks: ");

            double marks = Double.parseDouble(input);
            data[a] = new StudentGrade();
            data[a].setTotalMarks(marks);

            if (marks < 40){
                data[a].setGrade("E");
            }

            if (marks >= 40 && marks <= 44) {
                data[a].setGrade("D");
            }

            if (marks >= 45 && marks <= 49) {
                data[a].setGrade("D+");
            }

            if (marks >= 50 && marks <= 54) {
                data[a].setGrade("C-");
            }

            if (marks >= 55 && marks <= 59) {
                data[a].setGrade("C");
            }

            if (marks >= 60 && marks <= 64) {
                data[a].setGrade("C+");
            }

            if (marks >= 65 && marks <= 69) {
                data[a].setGrade("B-");
            }

            if (marks >= 70 && marks <= 74) {
                data[a].setGrade("B");
            }

            if (marks >= 75 && marks <= 79) {
                data[a].setGrade("B+");
            }

            if (marks >= 80 && marks <= 84) {
                data[a].setGrade("A");
            }

            if (marks >= 85 && marks <= 100)
                data[a].setGrade("A+");
        }

        int grade1 = 0;
        int grade2 = 0;
        int grade3 = 0;
        int grade4 = 0;
        for (int a = 0; a < num; a++) {
            StudentGrade show = data[a];
            String i = show.getGrade();
            if (i.equals("A+")) {
                grade1++;
            }
            if (i.equals("A")) {
                grade2++;
            }
            if (i.equals("D")) {
                grade3++;
            }
            if (i.equals("E")) {
                grade4++;
            }
        }
        JOptionPane.showMessageDialog(null,"Student that getting A and A+ grade: " + (grade1 + grade2));

        JOptionPane.showMessageDialog(null,"Student that getting D and E grade: "+ (grade3 + grade4));
            }
        });
    }
}

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