Preston Kruckow

I have ran the program and it works but the buttons wont work on it
here is the code.
import java.awt.*; import java.awt.event.*; import java.awt.datatransfer.*; import java.text.DecimalFormat; import javax.swing.JOptionPane; public class Final extends Frame implements ActionListener { private Button keys[]; private Panel keypad; private TextField lcd; private double op1; private boolean first; private boolean foundKey; private boolean clearText; private int lastOp; private DecimalFormat calcPattern; public Final() { MenuBar mnuBar = new MenuBar(); setMenuBar(mnuBar); Menu mnuFile = new Menu("File", true); mnuBar.add(mnuFile); MenuItem mnuFileExit = new MenuItem("Exit"); mnuFile.add(mnuFileExit); Menu mnuEdit = new Menu("Edit",true); mnuBar.add(mnuEdit); MenuItem mnuEditClear = new MenuItem("Clear"); mnuEdit.add(mnuEditClear); mnuEdit.insertSeparator(1); MenuItem mnuEditCopy = new MenuItem("Copy"); mnuEdit.add(mnuEditCopy); MenuItem mnuEditPaste = new MenuItem("Paste"); mnuEdit.add(mnuEditPaste); Menu mnuAbout = new Menu("About",true); mnuBar.add(mnuAbout); MenuItem mnuAboutCalculator = new MenuItem("About Calculator"); mnuAbout.add(mnuAboutCalculator); mnuFileExit.addActionListener(this); mnuEditClear.addActionListener(this); mnuEditCopy.addActionListener(this); mnuEditPaste.addActionListener(this); mnuAboutCalculator.addActionListener(this); mnuFileExit.setActionCommand("Exit"); mnuEditClear.setActionCommand("Clear"); mnuEditCopy.setActionCommand("Copy"); mnuEditPaste.setActionCommand("Paste"); mnuAboutCalculator.setActionCommand("About"); lcd = new TextField(20); lcd.setEditable(false); keypad = new Panel(); keys = new Button[16]; first = true; op1 = 0.0; clearText = true; lastOp = 0; calcPattern = new DecimalFormat("########.########"); for(int i=0; i<=9; i++) keys[i] = new Button(String.valueOf(i)); keys[10] = new Button("/"); keys[11] = new Button("*"); keys[12] = new Button("-"); keys[13] = new Button("+"); keys[14] = new Button("="); keys[15] = new Button("."); setLayout(new BorderLayout()); keypad.setLayout(new GridLayout(4,4,10,10)); for(int i=7; i<=10; i++) keypad.add(keys[i]); for(int i=4; i<=6; i++) keypad.add(keys[i]); keypad.add(keys[11]); for(int i=1; i<=3; i++) keypad.add(keys[i]); keypad.add(keys[12]); keypad.add(keys[0]); for(int i=15; i<=13; i++) keypad.add(keys[i]); for(int i=0; i<keys.length; i++) keys[1].addActionListener(this); add(lcd, BorderLayout.NORTH); add(keypad, BorderLayout.CENTER); addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } } ); } public void actionPerformed(ActionEvent e) { String arg = e.getActionCommand(); if(arg == "Exit") System.exit(0); if(arg == "Clear") { clearText = true; first = true; op1 = 0.0; lcd.setText(""); lcd.requestFocus(); } if(arg == "Copy") { Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); StringSelection contents = new StringSelection(lcd.getText()); cb.setContents(contents, null); } if(arg == "Paste") { Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); Transferable content = cb.getContents(this); try { String s = (String)content.getTransferData(DataFlavor.stringFlavor); lcd.setText(calcPattern.format(Double.parseDouble(s))); } catch(Throwable exc) { lcd.setText(""); } } if(arg == "About") { String message ="Calculator ver. 1.0\nOpenExhibit Software\nCopyright 2004\nAll rights reserved"; JOptionPane.showMessageDialog(null,message,"About Calculator", JOptionPane.INFORMATION_MESSAGE); } foundKey = false; for(int i=0; i<keys.length && !foundKey; i++) { if(e.getSource() == keys[i]) { foundKey=true; switch(i) { case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9: case 15: if(clearText) { lcd.setText(""); clearText = false; } lcd.setText(lcd.getText() + keys[i].getLabel()); break; case 10: case 11: case 12: case 13: case 14: clearText = true; if(first) { if(lcd.getText().length()==0) op1 = 0.0; else op1 = Double.parseDouble(lcd.getText()); first = false; clearText = true; lastOp = i; } else { switch(lastOp) { case 10: op1 /= Double.parseDouble(lcd.getText()); break; case 11: op1 *= Double.parseDouble(lcd.getText()); break; case 12: op1 -= Double.parseDouble(lcd.getText()); break; case 13: op1 += Double.parseDouble(lcd.getText()); break; } lcd.setText(calcPattern.format(op1)); clearText = true; if(i==14)first = true; else lastOp = i; } break; } } } } public static void main(String args[]) { Final f = new Final(); f.setTitle("Calculator Application"); f.setBounds(200,200,300,300); f.setVisible(true); Image icon = Toolkit.getDefaultToolkit().getImage("calculator.gif"); f.setIconImage(icon); } }
[ May 22, 2006: Message edited by: Preston Kruckow ]

Ernest, I did what you said, but now the compiler is complaining that variable first might not have been initialized.

Alright I did that, but I'm still getting 25 errors when I compile it. Here is the revised code:

import java.io.*; public class finalprojectPrestonKruckow { public static void main(String[] args) throws IOException { String firstLetter; String first; BufferedReader dataIn = new BufferedReader(new InputStreamReader(System.in)); System.out.print("Enter the first letter of your first name "); firstLetter = dataIn.readLine(); if (firstLetter == 'a') first = "poopsie "; else if (firstLetter == 'b') first = "lumpy "; else if (firstLetter =='c') first = "buttercup "; else if (firstLetter == 'd') first = "gidget "; else if (firstLetter == 'e') first = "crusty "; else if (firstLetter == 'f') first = "greasy "; else if (firstLetter == 'g') first = "fluffy "; else if (firstLetter == 'h') first = "cheeseball "; else if (firstLetter == 'i') first = "chim-chim "; else if (firstLetter == 'j') first = "stinky "; else if (firstLetter == 'k') first = "flunky "; else if (firstLetter == 'l') first = "boobie "; else if (firstLetter == 'm') first = "pinky "; else if (firstLetter == 'n') first = "zippy "; else if (firstLetter == 'o') first = "goober "; else if (firstLetter == 'p') first = "doofus "; else if (firstLetter == 'q') first = "slimy "; else if (firstLetter == 'r') first = "loopy "; else if (firstLetter == 's') first = "snotty "; else if (firstLetter == 't') first = "tulefel "; else if (firstLetter == 'u') first = "dorky "; else if (firstLetter == 'v') first = "squeezit "; else if (firstLetter == 'w') first = "oprah "; else if (firstLetter == 'x') first = "skipper "; else if (firstLetter == 'y') first = "dinky "; else first = "zsa-zsa "; System.out.println("Your new first name is " + first); } } Currently 25 errors...

I'm having a problem with getting the wrong output in this program. Here is the code:

import java.io.*; public class finalproject { public static void main(String[] args) throws IOException { String firstLetter; String first; BufferedReader dataIn = new BufferedReader(new InputStreamReader(System.in)); System.out.print("Enter the first letter of your first name "); firstLetter = dataIn.readLine(); if (firstLetter == "a") first = "poopsie "; else if (firstLetter == "b") first = "lumpy "; else if (firstLetter =="c") first = "buttercup "; else if (firstLetter == "d") first = "gidget "; else if (firstLetter == "e") first = "crusty "; else if (firstLetter == "f") first = "greasy "; else if (firstLetter == "g") first = "fluffy "; else if (firstLetter == "h") first = "cheeseball "; else if (firstLetter == "i") first = "chim-chim "; else if (firstLetter == "j") first = "stinky "; else if (firstLetter == "k") first = "flunky "; else if (firstLetter == "l") first = "boobie "; else if (firstLetter == "m") first = "pinky "; else if (firstLetter == "n") first = "zippy "; else if (firstLetter == "o") first = "goober "; else if (firstLetter == "p") first = "doofus "; else if (firstLetter == "q") first = "slimy "; else if (firstLetter == "r") first = "loopy "; else if (firstLetter == "s") first = "snotty "; else if (firstLetter == "t") first = "tulefel "; else if (firstLetter == "u") first = "dorky "; else if (firstLetter == "v") first = "squeezit "; else if (firstLetter == "w") first = "oprah "; else if (firstLetter == "x") first = "skipper "; else if (firstLetter == "y") first = "dinky "; else first = "zsa-zsa "; System.out.println("Your new first name is " + first); } } It compiles, but always prints out zsa-zsa every time.