Java-Programs/src/college/understanding_GUI/Calculator.java at main · HarshitRV/Java-Programs · GitHub

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package src.college.understanding_GUI;

import java.awt.*;
import java.awt.event.*;

public class Calculator extends Frame implements ActionListener {
    Label num1, num2, result;
    TextField forNum1, forNum2, forResult;
    Button add, sub, mul, div, clear;

    // construtor to give heading to the window
    public Calculator(String s) {
        super(s);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                dispose();
            }
        });
    }

    // function to create window
    public void createWindow() {
        // creating Label object
        num1 = new Label("NUM-1");
        num2 = new Label("NUM-2");

        // creating TextFiedl object
        forNum1 = new TextField(12);
        forNum2 = new TextField(12);
        forResult = new TextField(12);

        // creating Button object
        add = new Button("+");
        sub = new Button("-");
        mul = new Button("*");
        div = new Button("/");
        clear = new Button("Clear");

        // adding Listenrs to the buttons
        add.addActionListener(this);
        sub.addActionListener(this);
        mul.addActionListener(this);
        div.addActionListener(this);
        clear.addActionListener(this);

        // setting layout to null
        setLayout(null);

        // setting the coordinates for
        // components on the window
        // x y w h
        num1.setBounds(100, 50, 60, 30);
        // num1.setBackground(Color.red);
        forNum1.setBounds(170, 50, 120, 30);

        num2.setBounds(100, 100, 60, 30);
        // num2.setBackground(Color.red);
        forNum2.setBounds(170, 100, 120, 30);

        forResult.setBounds(100, 140, 190, 30);
        forResult.setBackground(Color.blue);
        forResult.setForeground(Color.white);

        add.setBounds(100, 180, 30, 30);
        sub.setBounds(150, 180, 30, 30);
        mul.setBounds(205, 180, 30, 30);
        div.setBounds(260, 180, 30, 30);
        clear.setBounds(95, 230, 205, 35);
        // clear.setBackground(Color.yellow);

        // adding the components to the window
        add(num1);
        add(forNum1);
        add(num2);
        add(forNum2);
        add(forResult);
        add(add);
        add(sub);
        add(mul);
        add(div);
        add(clear);

        // setting up the UI
        setSize(400, 300);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        double n1, n2;
        try {
            if (e.getSource() == add) {

                n1 = Double.parseDouble(forNum1.getText());
                n2 = Double.parseDouble(forNum2.getText());
                forResult.setText((n1 + n2) + "");

                forNum1.setText((n1 + n2) + "");
                forNum2.setText("");
            }
            if (e.getSource() == sub) {
                n1 = Double.parseDouble(forNum1.getText());
                n2 = Double.parseDouble(forNum2.getText());
                forResult.setText((n1 - n2) + "");

                forNum1.setText((n1 - n2) + "");
                forNum2.setText("");
            }
            if (e.getSource() == mul) {
                n1 = Double.parseDouble(forNum1.getText());
                n2 = Double.parseDouble(forNum2.getText());
                forResult.setText((n1 * n2) + "");

                forNum1.setText((n1 * n2) + "");
                forNum2.setText("");
            }
            if (e.getSource() == div) {
                n1 = Double.parseDouble(forNum1.getText());
                n2 = Double.parseDouble(forNum2.getText());
                forResult.setText((n1 / n2) + "");

                forNum1.setText((n1 / n2) + "");
                forNum2.setText("");
            }
            if (e.getSource() == clear) {
                forNum1.setText("");
                forNum2.setText("");
                forResult.setText("");
            }
        } catch (NumberFormatException ex) {
            forResult.setText("Number format exception");
            forNum1.setText("");
            forNum2.setText("");
        }
    }

    public static void main(String[] args) {
        Calculator c = new Calculator("Calculator");
        c.createWindow();
    }
}