Question

create scientific calculator using java language with OOP rule and interfaces.

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class JavaCalculator extends JFrame {
    private JButton Num1;
        private JButton Num2;
        private JButton Num3;
        private JButton Num4;
        private JButton Num5;
        private JButton Num6;
        private JButton Num7;
        private JButton Num8;
        private JButton Num9;
        private JButton Num0;
    private JButton jbtEqual;
        private JButton jbtAdd;
        private JButton jbtSubtract;
        private JButton jbtMultiply;
        private JButton jbtDivide;
        private JButton jbtSolve;
        private JButton jbtClear;
        private double TEMP;
        private double SolveTEMP;
    private JTextField jtfResult;
    String display = "";

    public JavaCalculator() {
        JPanel c = new JPanel();
        c.setLayout(new GridLayout(4, 3));
        c.add(Num1 = new JButton("1"));
        c.add(Num2 = new JButton("2"));
        c.add(Num3 = new JButton("3"));
        c.add(Num4 = new JButton("4"));
        c.add(Num5 = new JButton("5"));
        c.add(Num6 = new JButton("6"));
        c.add(Num7 = new JButton("7"));
        c.add(Num8 = new JButton("8"));
        c.add(Num9 = new JButton("9"));
        c.add(Num0 = new JButton("0"));
        c.add(jbtClear = new JButton("C"));


        JPanel p2 = new JPanel();
        p2.setLayout(new FlowLayout());
        p2.add(jtfResult = new JTextField(20));
        jtfResult.setHorizontalAlignment(JTextField.RIGHT);
        jtfResult.setEditable(false);

                JPanel p3 = new JPanel();
                p3.setLayout(new GridLayout(5, 1));
                p3.add(jbtAdd = new JButton("+"));
                p3.add(jbtSubtract = new JButton("-"));
                p3.add(jbtMultiply = new JButton("*"));
                p3.add(jbtDivide = new JButton("/"));
                p3.add(jbtSolve = new JButton("="));

        JPanel p = new JPanel();
        p.setLayout(new GridLayout());
        p.add(p2, BorderLayout.NORTH);
        p.add(c, BorderLayout.SOUTH);
        p.add(p3, BorderLayout.EAST);


        add(p);

        Num1.addActionListener(new ListenToOne());
        Num2.addActionListener(new ListenToTwo());
        Num3.addActionListener(new ListenToThree());
                Num4.addActionListener(new ListenToFour());
        Num5.addActionListener(new ListenToFive());
        Num6.addActionListener(new ListenToSix());
        Num7.addActionListener(new ListenToSeven());
        Num8.addActionListener(new ListenToEight());
        Num9.addActionListener(new ListenToNine());
        Num0.addActionListener(new ListenToZero());

        jbtAdd.addActionListener(new ListenToAdd());
        jbtSubtract.addActionListener(new ListenToSubtract());
        jbtMultiply.addActionListener(new ListenToMultiply());
        jbtDivide.addActionListener(new ListenToDivide());
        jbtSolve.addActionListener(new ListenToSolve());



    } //JavaCaluclator()

    class ListenToOne implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "1");
        }
    }
    class ListenToTwo implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "2");
        }
    }
    class ListenToThree implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "3");
        }
    }
    class ListenToFour implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "4");
        }
    }
    class ListenToFive implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "5");
        }
    }
    class ListenToSix implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "6");
        }
    }
    class ListenToSeven implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "7");
        }
    }
    class ListenToEight implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "8");
        }
    }
    class ListenToNine implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "9");
        }
    }
    class ListenToZero implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "0");
        }
    }

        class ListenToAdd implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            TEMP = Double.parseDouble(jtfResult.getText());
                        jtfResult.setText("");

        }
    }
    class ListenToSubtract implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "0");
        }
    }
    class ListenToMultiply implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "0");
        }
    }
    class ListenToDivide implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            display = jtfResult.getText();
            jtfResult.setText(display + "0");
        }
    }
    class ListenToSolve implements ActionListener {
        public void actionPerformed(ActionEvent e) {
                        SolveTEMP = jtfResult.getText();
            jtfResult.setText(TEMP + Double.parseDouble(jtfResult);
        }
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        JavaCalculator calc = new JavaCalculator();
        calc.pack();
        calc.setLocationRelativeTo(null);
                calc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        calc.setVisible(true);
    }

}