Standard Calculator - GUI Source Code in Java

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Home » Java Home » GUI Home » Standard Calculator

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Title	Standard Calculator
Author	jen fernandez
Author Email	jfernandez.ph [at] gmail.com
Description	This is just a laboratory exercise at school. I wonder if there are some variables declared though it has no use because this code is actually a both Standard and Scientific Calculator Code. I haven't finish the whole scientific program so I've decided to finalize the Standard Calculator first so I can post it already. If you will get the code, I suggest that you should try to understand how the code works and so you can also delete some of the words or variables that I failed to erase. if you have some questions about it, mail me at
Category	Java » GUI
Hits	420720
Code	Select and Copy the Code
Code : import java.awt.; import javax.swing.; import java.awt.event.; / 25Oct2005: Designed and programmed by jfernandez.ph / / 13Nov2005: Designed and programmed by jfernandez.ph / public class Calculator implements ActionListener{ char o; int ctr=0; String value="", cv="", oBtn; Double answer, v1, v2; Double NumberConverted; Frame f; Panel p1, p2, p3, p4, p5, p6; private TextField tField; private Menu EditMenu; private MenuBar menuBar; private MenuItem fmi1, fmi2, fmi3; private Button num0, num1, num2, num3, num4, num5, num6, num7, num8, num9; private Button bAdd, bSub, bMul, bDiv, bPer, bSqrt, bFrac, bInt, bDot, bCE, equals, backspace, clear; / 25Oct2005: Designed and programmed by jfernandez.ph / / 13Nov2005: Designed and programmed by jfernandez.ph / Calculator(){ f = new Frame("Calculator"); menuBar = new MenuBar(); EditMenu = new Menu ("Edit"); fmi1 = new MenuItem(" Copy "); fmi2 = new MenuItem(" Paste "); fmi3 = new MenuItem(" Quit "); EditMenu.add(fmi1); EditMenu.add(fmi2); EditMenu.addSeparator(); EditMenu.add(fmi3); p1 = new Panel(); p2 = new Panel(); p3 = new Panel(); p4 = new Panel(); p5 = new Panel(); p6 = new Panel(); tField = new TextField(35); num0 = new Button ("0"); num1 = new Button ("1"); num2 = new Button ("2"); num3 = new Button ("3"); num4 = new Button ("4"); num5 = new Button ("5"); num6 = new Button ("6"); num7 = new Button ("7"); num8 = new Button ("8"); num9 = new Button ("9"); bAdd = new Button ("+"); bSub = new Button ("-"); bMul = new Button ("x"); bDiv = new Button ("/"); bPer = new Button ("%"); bSqrt = new Button ("sqrt"); bFrac = new Button ("1/x"); bInt = new Button ("+/-"); bDot = new Button ("."); bCE = new Button ("CE"); equals = new Button ("="); backspace = new Button ("Backspace"); clear = new Button ("C"); } / 25Oct2005: Designed and programmed by jfernandez.ph / / 13Nov2005: Designed and programmed by jfernandez.ph / public void launchFrame(){ tField.setText("0."); tField.setEnabled(false); menuBar.add(EditMenu); p2.add(backspace); p2.add(bCE); p2.add(clear); p3.add(num7); p3.add(num8); p3.add(num9); p3.add(bDiv); p3.add(bSqrt); p4.add(num4); p4.add(num5); p4.add(num6); p4.add(bMul); p4.add(bPer); p5.add(num1); p5.add(num2); p5.add(num3); p5.add(bSub); p5.add(bFrac); p6.add(num0); p6.add(bInt); p6.add(bDot); p6.add(bAdd); p6.add(equals); p2.setLayout(new GridLayout (1, 3, 2, 2) ); p3.setLayout(new GridLayout (1, 3, 2, 2) ); p4.setLayout(new GridLayout (1, 3, 2, 2) ); p5.setLayout(new GridLayout (1, 3, 2, 2) ); p6.setLayout(new GridLayout (1, 3, 2, 2) ); f.setLayout(new GridLayout (6, 1) ); f.setResizable(false); f.setSize(300,250); f.add(tField); f.add(p2); f.add(p3); f.add(p4); f.add(p5); f.add(p6); f.setVisible(true); f.setMenuBar(menuBar); f.pack(); // ACTION LISTENERS clear.addActionListener(this); bCE.addActionListener(this); num0.addActionListener(this); num1.addActionListener(this); num2.addActionListener(this); num3.addActionListener(this); num4.addActionListener(this); num5.addActionListener(this); num6.addActionListener(this); num7.addActionListener(this); num8.addActionListener(this); num9.addActionListener(this); bAdd.addActionListener(this); bSub.addActionListener(this); bMul.addActionListener(this); bDiv.addActionListener(this); bPer.addActionListener(this); bInt.addActionListener(this); bSqrt.addActionListener(this); bFrac.addActionListener(this); bDot.addActionListener(this); equals.addActionListener(this); backspace.addActionListener(this); fmi1.addActionListener(this); fmi2.addActionListener(this); fmi3.addActionListener(this); } / 25Oct2005: Designed and programmed by jfernandez.ph / / 13Nov2005: Designed and programmed by jfernandez.ph / / \|------------ START OF ACTION EVENTS ------------\| / public void actionPerformed(ActionEvent a){ try{ / \|-------- Handling Exceptions ---------\| / if(a.getSource()==num0){ value+=0; tField.setText(value); } if(a.getSource()==num1){ value+=1; tField.setText(value); } if(a.getSource()==num2){ value+=2; tField.setText(value); } if(a.getSource()==num3){ value+=3; tField.setText(value); } if(a.getSource()==num4){ value+=4; tField.setText(value); } if(a.getSource()==num5){ value+=5; tField.setText(value); } if(a.getSource()==num6){ value+=6; tField.setText(value); } if(a.getSource()==num7){ value+=7; tField.setText(value); } if(a.getSource()==num8){ value+=8; tField.setText(value); } if(a.getSource()==num9){ value+=9; tField.setText(value); } / 25Oct2005: Designed and programmed by jfernandez.ph / / 13Nov2005: Designed and programmed by jfernandez.ph / if (a.getSource() == bAdd){ v1 = Double.parseDouble( tField.getText() ); ctr=0; o = '+'; value=""; tField.setText("" +value); } if (a.getSource() == bSub){ v1 = Double.parseDouble( tField.getText() ); ctr=0; o = '-'; value=""; tField.setText("" +value); } if (a.getSource() == bMul){ v1 = Double.parseDouble( tField.getText() ); ctr=0; o = 'x'; value=""; tField.setText("" +value); } if (a.getSource() == bDiv){ v1 = Double.parseDouble( tField.getText() ); ctr=0; o = '/'; value=""; tField.setText("" +value); } if (a.getSource() == bPer){ v1 = Double.parseDouble( tField.getText() ); ctr=0; value=""; answer = (v1/100); tField.setText("" +answer); } / 25Oct2005: Designed and programmed by jfernandez.ph / / 13Nov2005: Designed and programmed by jfernandez.ph / / \|-- EQUALS ACTION --\| / if(a.getSource()==equals){ value=""; v2 = Double.parseDouble(tField.getText()); if(o=='+'){ ctr=0; answer = v1 + v2; tField.setText("" +answer); value=""; v1=null; v2=null; } else if(o=='-'){ ctr=0; answer = v1 - v2; tField.setText("" +answer); value=""; v1=null; v2=null; } else if(o=='x'){ ctr=0; answer = v1 v2; tField.setText("" +answer); value=""; v1=null; v2=null; } else if(o=='/'){ ctr=0; answer = v1 / v2; tField.setText("" +answer); value=""; v1=null; v2=null; } else if(o=='%'){ ctr=0; answer = v1 % v2; tField.setText("" +answer); value=""; v1=null; v2=null; } else{} } /* \|-- EQUALS ACTION --\| / / 25Oct2005: Designed and programmed by jfernandez.ph / / 13Nov2005: Designed and programmed by jfernandez.ph / / \|-- Clear --\| / if(a.getSource()==clear){ ctr=0; v1=null; v2=null; value=""; answer=0.; tField.setText("0."); } if(a.getSource()==bCE){ ctr=0; value=""; tField.setText("0."); } / \|-- Point --\| / if(a.getSource() == bDot){ if(ctr==0){ value+="."; ctr+=1; tField.setText("" +value); } else{ System.out.print(""); } } / \|-- Back Space --\| / if(a.getSource() == backspace){ value = value.substring(0, value.length()-1 ); tField.setText("" +value); } / \|-- Square Root --\| / if(a.getSource() == bSqrt){ ctr=0; value = ""; v1 = Math.sqrt( Double.parseDouble( tField.getText() ) ); tField.setText("" +v1); } / \|-- Integer --\| / if(a.getSource() == bInt){ ctr=0; NumberConverted = ( Double.parseDouble(tField.getText()) -1 ); value = ""; tField.setText("" +NumberConverted); } /* \|-- Reciprocal --\| / if(a.getSource() == bFrac){ ctr=0; value = ""; Double NumberContainer = ( 1 / Double.parseDouble( tField.getText() ) ); tField.setText("" +NumberContainer); } // ------------ Menu Item Actions ------------ // if(a.getSource() == fmi1){ cv = tField.getText(); } if(a.getSource() == fmi2){ tField.setText("" +cv); } if(a.getSource() == fmi3){ System.exit(0); } } // End of Try / \|-------- Attempting To Catch Runtime Errors ---------\| / catch(StringIndexOutOfBoundsException str){} catch(NumberFormatException nfe){} catch(NullPointerException npe){} } // END OF ACTION EVENTS / 25Oct2005: Designed and programmed by jfernandez.ph / / 13Nov2005: Designed and programmed by jfernandez.ph */ public static void main (String args[]){ Calculator s = new Calculator(); s.launchFrame(); } }

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