Calculator-Java-AWT/GUICalculator.java at main · IsratIJK/Calculator-Java-AWT · GitHub

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

class GUICalculator extends Frame implements ActionListener {

  TextField text;
  Panel panel;
  String button[] = { "7", "8", "9", "+", "4", "5", "6", "—", "1", "2", "3", "*", "AC", "0", "/", "=" };
  Button btn[] = new Button[16];
  int A = 0, B = 0, output = 0;
  char opt;

  public GUICalculator() {

    Font f = new Font("Helvetica", Font.PLAIN, 20);

    text = new TextField(10);
    text.setFont(f);
    panel = new Panel();
    add(text, "North");
    add(panel, "Center");
    panel.setLayout(new GridLayout(4, 4));

    for (int i = 0; i < 16; i++) {

      btn[i] = new Button(button[i]);
      btn[i].setFont(f);
      btn[i].addActionListener(this);
      panel.add(btn[i]);
    }

    addWindowListener(new WindowAdapter() {

      public void windowClosing(WindowEvent we) {
        System.exit(0);
      }
    });
  }

  public void actionPerformed(ActionEvent ae) {

    String str = ae.getActionCommand();

    if (str.equals("+")) {

      opt = '+';
      A = Integer.parseInt(text.getText());
      text.setText("");
    } else if (str.equals("—")) {
      opt = '—';
      A = Integer.parseInt(text.getText());
      text.setText("");
    } else if (str.equals("*")) {
      opt = '*';
      A = Integer.parseInt(text.getText());
      text.setText("");
    } else if (str.equals("/")) {
      opt = '/';
      A = Integer.parseInt(text.getText());
      text.setText("");
    } else if (str.equals("=")) {

      B = Integer.parseInt(text.getText());

      switch (opt) {

        case '+':
          output = A + B;
          break;
        case '—':
          output = A - B;
          break;
        case '*':
          output = A * B;
          break;
        case '/':
          output = A / B;
          break;
      }
      text.setText(output + "");
      output = 0;
    } else if (str.equals("AC")) {

      text.setText("");
      A = B = output = 0;
    } else {
      text.setText(text.getText() + str);
    }
  }

  public static void main(String args[]) {

    GUICalculator m = new GUICalculator();
    m.setTitle("GUI — Calculator");
    m.setSize(300, 350);
    m.setBackground(Color.PINK);
    m.setForeground(Color.BLACK);
    m.setVisible(true);
  }
}