calculator.java

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package calculator;

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

public class Calculator extends Applet {
  boolean isStandalone = false;
  TextField textField1 = new TextField();
  Button button1 = new Button();
  Button button2 = new Button();
  Button button3 = new Button();
  Button button4 = new Button();
  Button button5 = new Button();
  Button button6 = new Button();
  Button button7 = new Button();
  Button button8 = new Button();
  Button button9 = new Button();
  Button button10 = new Button();
  Button button11 = new Button();
  Button button12 = new Button();
  Button button13 = new Button();
  Button button14 = new Button();
  Button button15 = new Button();
  Button button16 = new Button();
  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  /**Construct the applet*/
  public Calculator() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    textField1.setText("0");
    textField1.setBounds(new Rectangle(13, 19, 283, 32));
    this.setLayout(null);
    button1.setLabel("7");
    button1.setBounds(new Rectangle(18, 62, 64, 31));
    button2.setLabel("8");
    button2.setBounds(new Rectangle(84, 62, 65, 31));
    button3.setLabel("9");
    button3.setBounds(new Rectangle(151, 62, 64, 32));
    button4.setLabel("/");
    button4.setBounds(new Rectangle(217, 62, 68, 32));
    button5.setLabel("4");
    button5.setBounds(new Rectangle(18, 94, 64, 32));
    button6.setLabel("5");
    button6.setBounds(new Rectangle(85, 94, 64, 32));
    button7.setLabel("6");
    button7.setBounds(new Rectangle(150, 94, 66, 32));
    button8.setLabel("*");
    button8.setBounds(new Rectangle(218, 95, 67, 31));
    button9.setLabel("1");
    button9.setBounds(new Rectangle(18, 127, 64, 32));
    button10.setLabel("2");
    button10.setBounds(new Rectangle(84, 127, 65, 32));
    button11.setLabel("3");
    button11.setBounds(new Rectangle(151, 127, 65, 32));
    button12.setLabel("-");
    button12.setBounds(new Rectangle(218, 127, 67, 32));
    button13.setLabel("0");
    button13.setBounds(new Rectangle(18, 160, 64, 34));
    button14.setLabel(".");
    button14.setBounds(new Rectangle(85, 161, 64, 34));
    button15.setLabel("=");
    button15.setBounds(new Rectangle(151, 160, 66, 35));
    button16.setLabel("+");
    button16.setBounds(new Rectangle(219, 160, 66, 35));
    this.add(textField1, null);
    this.add(button1, null);
    this.add(button2, null);
    this.add(button3, null);
    this.add(button4, null);
    this.add(button5, null);
    this.add(button6, null);
    this.add(button7, null);
    this.add(button8, null);
    this.add(button9, null);
    this.add(button10, null);
    this.add(button11, null);
    this.add(button12, null);
    this.add(button13, null);
    this.add(button14, null);
    this.add(button15, null);
    this.add(button16, null);
  }
  /**Start the applet*/
  public void start() {
  }
  /**Stop the applet*/
  public void stop() {
  }
  /**Destroy the applet*/
  public void destroy() {
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }
}