Question

In Java

Create a simple GUI that gets the exam score and shows the corresponding letter grade by clicking on the “Convert Score to Letter Grade” button.

Answer 1

Here is code:

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import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Score extends JFrame implements ActionListener {

    JTextField txtdata;

    JButton calbtn = new JButton("Calc");

    JLabel outputLb = new JLabel();

    public Score() {

        JPanel myPanel = new JPanel();

        add(myPanel);

        myPanel.setLayout(new GridLayout(1, 2));

        JLabel label = new JLabel("Enter Score : ");

        myPanel.add(label);

        txtdata = new JTextField();

        myPanel.add(txtdata);

        myPanel.add(calbtn);

        calbtn.addActionListener(this);

        myPanel.add(outputLb);

    }

    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == calbtn) {

            int data = Integer.parseInt(txtdata.getText()); //perform your operation

            String result = "";

            if (data > 100) {

                result = "Bad score";

            } else if (data >= 85 && data <= 100) {

                result = "Letter grade : A";

            } else if (data >= 75 && data <= 84) {

                result = "Letter grade : B";

            } else if (data >= 60 && data <= 74) {

                result = "Letter grade : C";

            } else if (data >= 50 && data <= 59) {

                result = "Letter grade : D";

            } else if (data < 0) {

                result = "Bad score";

            } else if (data < 50) {

                result = "Letter grade : F";

            } else {

                result = "Bad score";

            }

            outputLb.setText(result);

        }

    }

    public static void main(String args[]) {

        Score g = new Score();

        g.setLocation(10, 10);

        g.setSize(500, 70);

        g.setVisible(true);

    }

}

Output: