Calculator In Java - Beginners / Lab Assignments Source Code in Java

Special : Web Developer's Collection CD-ROM
50,000+ Web Templates, Logos, Cliparts, Scripts. Order Now!

Add to Favorites Make Home Page

1866 Online

Language Categories

Source Codes Home
Project Ideas New!
Interview Questions
FAQs Home
ASP Home: ASP Source Codes; ASP Script Directory New!; ASP .Net Script Directory New!; ASP Interview Questions; ASP FAQs; ASP How Tos
C Home: C Source Codes; C Script Directory New!; C Interview Questions; C FAQs; C How Tos
C++ Home: C++ Source Codes; C++ Script Directory New!; C++ Interview Questions; C++ FAQs; C++ How Tos
Java Home: Java Source Codes; Java Directory New!; Java Interview Questions; Java FAQs; Java How Tos
JavaScript Home: JavaScript Directory New!; JavaScript Source Codes; JavaScript FAQs; JavaScript How Tos
COBOL Home: COBOL Source Codes; COBOL FAQs; COBOL How Tos
Pascal Home: Pascal Source Codes; Pascal FAQs; Pascal How Tos
PHP Script Directory New!
Python Script Directory New!
Perl & CGI Script Directory New!
Flash Script Directory New!
CFML Script Directory New!
Remotely Hosted Scripts New!
Tools & Utilities Directory New!
XML Script Directory New!
Best Programmers: Amit Mathur; Vishal Bhardwaj; Deepesh Jain
Vyom NetWork

Our Services

Get 9,000 Interview Questions & Answers in an eBook.

9500+ Pages
9000 Question & Answers
All Tech. Categories

14 MB Content

Get it now !!

Home » Java Home » Beginners / Lab Assignments Home » Calculator In Java

A D V E R T I S E M E N T

Title	Calculator In Java
Author	James
Author Email	coolits6600 [at] yahoo.com
Description
Category	Java » Beginners / Lab Assignments
Hits	397506
Code	Select and Copy the Code
import java.awt.; import java.awt.event.; import java.applet.; public class CalculatorApplet extends Applet implements ActionListener { private Button keysArray[]; private Panel keyPad; private TextField lcdField; private double result; private boolean first; private boolean foundKey; static boolean clearText; private int prevOperator; public void init() { lcdField = new TextField(20); keyPad = new Panel (); keysArray = new Button[17]; result = 0.0; prevOperator = 0; first = true; clearText = true; //Set frame layout manager setLayout(new BorderLayout()); lcdField.setEditable(false); //Create buttons for (int i = 0; i <=9; i++) keysArray[i] = new Button(String.valueOf(i)); keysArray[10] = new Button("/"); keysArray[11] = new Button(""); keysArray[12] = new Button("-"); keysArray[13] = new Button("+"); keysArray[14] = new Button("="); keysArray[15] = new Button("."); keysArray[16] = new Button("CLR"); //Set panel layout manager keyPad.setLayout(new GridLayout (4,4)); //Add button to keyPad panel for (int i = 7; i <=10; i++) //adds Button 7,8,9, and divide to Panel keyPad.add(keysArray[i]); for (int i = 4; i <6; i++) //adds buttons 4,5,6 to Panel keyPad.add(keysArray[i]); keyPad.add(keysArray[11]); //adds multiply button to Panel for (int i = 1; i <= 3;i++) //adds buttons 1,2 and 3 to Panel keyPad.add(keysArray[i]); keyPad.add(keysArray[12]);//adds minus button to Panel keyPad.add(keysArray[0]); //adds 0 key to Panel for (int i = 15; i >=13; i--) keyPad.add(keysArray[i]); //adds decimal point, equal, and addition ke ys Panel add(lcdField, BorderLayout.NORTH); //adds text field to top of Frame add(keyPad, BorderLayout.CENTER); //adds Panel to center of Frame add(keysArray[16], BorderLayout.EAST); //adds Clear key to right side of applet for(int i = 0; i < keysArray.length; i++) keysArray[i].addActionListener(this); } public void actionPerformed(ActionEvent e) { foundKey = false; //Search for the key pressed for (int i = 0; i < keysArray.length && !foundKey; i++) if(e.getSource() == keysArray[i]) //key match found { foundKey = true; switch(i) { case 0: case 1: case 2: case 3: case 4: //number buttons case 5: case 6: case 7: case 8: case 9: //0-9 case 15: if (clearText) { lcdField.setText(""); clearText = false; } lcdField.setText(lcdField.getText() + keysArray[i].getLabel()); break; case 10:// divide button case 11:// multiply button case 12:// minus button case 13:// plus button case 14:// equal button clearText = true; if (first) // First operand { if(lcdField.getText().length()==0) result = 0.0; else result = Double.valueOf(lcdField.getText()).doubleValue(); first = false; prevOperator = i; //save previous operator } else //second operand already enter, so calculator total { switch(prevOperator) { case 10: //divide Button result /= Double.valueOf(lcdField.getText()). doubleValue(); break; case 11: //multiply Button result *= Double.valueOf(lcdField.getText()). doubleValue(); break; case 12: //minus button result -= Double.valueOf(lcdField.getText()). doubleValue(); break; case 13: //plus button result += Double.valueOf(lcdField.getText()). doubleValue(); break; } lcdField.setText(Double.toString(result)); if (i==14)//equal button first = true; else prevOperator = i; //save previous opetator } break; case 16://Clear button clearText = true; first = true; lcdField.setText(""); result = 0.0; prevOperator = 0; break; } } } }

Related Source Codes

Script Name Author

Sending mail Using JavaMail to Yahoo and Gmail accounts sai prasad

Simple Program in Java to Implement Multithreading Satish.K

Simple Calculator in Java Using Remote Method Invocation Satish.K

Guest Book Application Using Servlets Satish.K

String Manipulation Using Stringification Satish.K

String Manipulation Using Stringification Satish.K

Moving Ball Application Using Java Beans Satish.K

Rapid Roll game subrahmanyeswararao

student mgm arpan

Sourav Datta

Download Manager Sagar

Address Book in Java Rahul Chouhan

address book using java database connectivity(jdbc-msaccess) shekhar bansal

sun Steganography B.Rajavel

Connecting Java with MS-Access - Inserting data in Aseem

A D V E R T I S E M E N T

Google Groups Subscribe to SourceCodesWorld - Techies Talk

Email:

Free eBook - Interview Questions: Get over 1,000 Interview Questions in an eBook for free when you join JobsAssist. Just click on the button below to join JobsAssist and you will immediately receive the Free eBook with thousands of Interview Questions in an ebook when you join.

Free Tutorials - HTML, Java, SQL, PHP, ASP, Perl, SQL Tutorials
Discuss Programming Problems and Freshers Jobs related issues here.
Discuss Final Year Project Ideas here.