Kalkulator - co z nim zrobić?

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2010-05-23 09:22

Rejestracja: 9 lat temu

Ostatnio: 9 lat temu

0

Witam.
Mam plik calculator.java (pobrany z internetu) o następującej zawartości:

/*
Name: Hemanth. B
Website: http://www.java-swing-tutorial.com

Topic: A basic Java Swing Calculator

Conventions Used in Source code
---------------------------------
    1. All JLabel components start with jlb*
    2. All JPanel components start with jpl*
    3. All JMenu components start with jmenu*
    4. All JMenuItem components start with jmenuItem*
    5. All JDialog components start with jdlg*
    6. All JButton components start with jbn*
*/

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;

public class Calculator extends JFrame implements ActionListener{
    // Variables
    final int MAX_INPUT_LENGTH = 20;
    final int INPUT_MODE = 0;
    final int RESULT_MODE = 1;
    final int ERROR_MODE = 2;
    int displayMode;

    boolean clearOnNextDigit, percent;
    double lastNumber;
    String lastOperator;

    private JMenu jmenuFile, jmenuHelp;
    private JMenuItem jmenuitemExit, jmenuitemAbout;

    private JLabel jlbOutput;
    private JButton jbnButtons[];
    private JPanel jplMaster, jplBackSpace, jplControl;

    /*
     * Font(String name, int style, int size)
      Creates a new Font from the specified name, style and point size.
     */

    Font f12 = new Font("Times New Roman", 0, 12);
    Font f121 = new Font("Times New Roman", 1, 12);

    // Constructor 
    public Calculator() 
    {
        /* Set Up the JMenuBar.
         * Have Provided All JMenu's with Mnemonics
         * Have Provided some JMenuItem components with Keyboard Accelerators
         */ 

        jmenuFile = new JMenu("File");
        jmenuFile.setFont(f121);
        jmenuFile.setMnemonic(KeyEvent.VK_F);

        jmenuitemExit = new JMenuItem("Exit");
        jmenuitemExit.setFont(f12);
        jmenuitemExit.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_X, 
                                                    ActionEvent.CTRL_MASK));
        jmenuFile.add(jmenuitemExit);

        jmenuHelp = new JMenu("Help");
        jmenuHelp.setFont(f121);
        jmenuHelp.setMnemonic(KeyEvent.VK_H);

        jmenuitemAbout = new JMenuItem("About Calculator");
        jmenuitemAbout.setFont(f12);
        jmenuHelp.add(jmenuitemAbout);

        JMenuBar mb = new JMenuBar();
        mb.add(jmenuFile);
        mb.add(jmenuHelp);
        setJMenuBar(mb);

        //Set frame layout manager

        setBackground(Color.gray);

        jplMaster = new JPanel();

        jlbOutput = new JLabel("0");
        jlbOutput.setHorizontalTextPosition(JLabel.RIGHT);
        jlbOutput.setBackground(Color.WHITE);
        jlbOutput.setOpaque(true);

        // Add components to frame
        getContentPane().add(jlbOutput, BorderLayout.NORTH);

        jbnButtons = new JButton[23];
//      GridLayout(int rows, int cols, int hgap, int vgap) 

        JPanel jplButtons = new JPanel();           // container for Jbuttons

        // Create numeric Jbuttons
        for (int i=0; i<=9; i++)
        {
            // set each Jbutton label to the value of index
            jbnButtons[i] = new JButton(String.valueOf(i));
        }

        // Create operator Jbuttons
        jbnButtons[10] = new JButton("+/-");
        jbnButtons[11] = new JButton(".");
        jbnButtons[12] = new JButton("=");
        jbnButtons[13] = new JButton("/");
        jbnButtons[14] = new JButton("*");
        jbnButtons[15] = new JButton("-");
        jbnButtons[16] = new JButton("+");
        jbnButtons[17] = new JButton("sqrt");
        jbnButtons[18] = new JButton("1/x");
        jbnButtons[19] = new JButton("%");

        jplBackSpace = new JPanel();
        jplBackSpace.setLayout(new GridLayout(1, 1, 2, 2));

        jbnButtons[20] = new JButton("Backspace");
        jplBackSpace.add(jbnButtons[20]);

        jplControl = new JPanel();
        jplControl.setLayout(new GridLayout(1, 2, 2 ,2));

        jbnButtons[21] = new JButton(" CE ");
        jbnButtons[22] = new JButton("C");

        jplControl.add(jbnButtons[21]);
        jplControl.add(jbnButtons[22]);

//      Setting all Numbered JButton's to Blue. The rest to Red
        for (int i=0; i<jbnButtons.length; i++) {
            jbnButtons[i].setFont(f12);

            if (i<10)
                jbnButtons[i].setForeground(Color.blue);

            else
                jbnButtons[i].setForeground(Color.red);
        }

        // Set panel layout manager for a 4 by 5 grid
        jplButtons.setLayout(new GridLayout(4, 5, 2, 2));

        //Add buttons to keypad panel starting at top left
        // First row
        for(int i=7; i<=9; i++)     {
            jplButtons.add(jbnButtons[i]);
        }

        // add button / and sqrt
        jplButtons.add(jbnButtons[13]);
        jplButtons.add(jbnButtons[17]);

        // Second row
        for(int i=4; i<=6; i++)
        {
            jplButtons.add(jbnButtons[i]);
        }

        // add button * and x^2
        jplButtons.add(jbnButtons[14]);
        jplButtons.add(jbnButtons[18]);

        // Third row
        for( int i=1; i<=3; i++)
        {
            jplButtons.add(jbnButtons[i]);
        }

        //adds button - and %
        jplButtons.add(jbnButtons[15]);
        jplButtons.add(jbnButtons[19]);

        //Fourth Row
        // add 0, +/-, ., +, and =
        jplButtons.add(jbnButtons[0]);
        jplButtons.add(jbnButtons[10]);
        jplButtons.add(jbnButtons[11]);
        jplButtons.add(jbnButtons[16]);
        jplButtons.add(jbnButtons[12]);

        jplMaster.setLayout(new BorderLayout());
        jplMaster.add(jplBackSpace, BorderLayout.WEST);
        jplMaster.add(jplControl, BorderLayout.EAST);
        jplMaster.add(jplButtons, BorderLayout.SOUTH);

        // Add components to frame
        getContentPane().add(jplMaster, BorderLayout.SOUTH);
        requestFocus();

        //activate ActionListener
        for (int i=0; i<jbnButtons.length; i++){
            jbnButtons[i].addActionListener(this);
        }

        jmenuitemAbout.addActionListener(this);
        jmenuitemExit.addActionListener(this);

        clearAll();

        //add WindowListener for closing frame and ending program
        addWindowListener(new WindowAdapter() {

                public void windowClosed(WindowEvent e)
                {
                    System.exit(0);
                }
            }
        );
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }   //End of Contructor Calculator

    // Perform action
    public void actionPerformed(ActionEvent e){
        double result = 0;

        if(e.getSource() == jmenuitemAbout){
            JDialog dlgAbout = new CustomABOUTDialog(this, "About Java Swing Calculator", true);
            dlgAbout.setVisible(true);
        }else if(e.getSource() == jmenuitemExit){
            System.exit(0);
        }   

        // Search for the button pressed until end of array or key found
        for (int i=0; i<jbnButtons.length; i++)
        {
            if(e.getSource() == jbnButtons[i])
            {
                switch(i)
                {
                    case 0:
                        addDigitToDisplay(i);
                        break;

                    case 1:
                        addDigitToDisplay(i);
                        break;

                    case 2:
                        addDigitToDisplay(i);
                        break;

                    case 3:
                        addDigitToDisplay(i);
                        break;

                    case 4:
                        addDigitToDisplay(i);
                        break;

                    case 5:
                        addDigitToDisplay(i);
                        break;

                    case 6:
                        addDigitToDisplay(i);
                        break;

                    case 7:
                        addDigitToDisplay(i);
                        break;

                    case 8:
                        addDigitToDisplay(i);
                        break;

                    case 9:
                        addDigitToDisplay(i);
                        break;

                    case 10:    // +/-
                        processSignChange();
                        break;

                    case 11:    // decimal point
                        addDecimalPoint();
                        break;

                    case 12:    // =
                        processEquals();
                        break;

                    case 13:    // divide
                        processOperator("/");
                        break;

                    case 14:    // *
                        processOperator("*");
                        break;

                    case 15:    // -
                        processOperator("-");
                        break;

                    case 16:    // +
                        processOperator("+");
                        break;

                    case 17:    // sqrt
                        if (displayMode != ERROR_MODE)
                        {
                            try
                            {
                                if (getDisplayString().indexOf("-") == 0)
                                    displayError("Invalid input for function!");

                                result = Math.sqrt(getNumberInDisplay());
                                displayResult(result);
                            }

                            catch(Exception ex)
                            {
                                displayError("Invalid input for function!");
                                displayMode = ERROR_MODE;
                            }
                        }
                        break;

                    case 18:    // 1/x
                        if (displayMode != ERROR_MODE){
                            try
                            {
                                if (getNumberInDisplay() == 0)
                                    displayError("Cannot divide by zero!");

                                result = 1 / getNumberInDisplay();
                                displayResult(result);
                            }

                            catch(Exception ex) {
                                displayError("Cannot divide by zero!");
                                displayMode = ERROR_MODE;
                            }
                        }
                        break;

                    case 19:    // %
                        if (displayMode != ERROR_MODE){
                            try {
                                result = getNumberInDisplay() / 100;
                                displayResult(result);
                            }

                            catch(Exception ex) {
                                displayError("Invalid input for function!");
                                displayMode = ERROR_MODE;
                            }
                        }
                        break;

                    case 20:    // backspace
                        if (displayMode != ERROR_MODE){
                            setDisplayString(getDisplayString().substring(0,
                                        getDisplayString().length() - 1));

                            if (getDisplayString().length() < 1)
                                setDisplayString("0");
                        }
                        break;

                    case 21:    // CE
                        clearExisting();
                        break;

                    case 22:    // C
                        clearAll();
                        break;
                }
            }
        }
    }

    void setDisplayString(String s){
        jlbOutput.setText(s);
    }

    String getDisplayString (){
        return jlbOutput.getText();
    }

    void addDigitToDisplay(int digit){
        if (clearOnNextDigit)
            setDisplayString("");

        String inputString = getDisplayString();

        if (inputString.indexOf("0") == 0){
            inputString = inputString.substring(1);
        }

        if ((!inputString.equals("0") || digit > 0)  && inputString.length() < MAX_INPUT_LENGTH){
            setDisplayString(inputString + digit);
        }

        displayMode = INPUT_MODE;
        clearOnNextDigit = false;
    }

    void addDecimalPoint(){
        displayMode = INPUT_MODE;

        if (clearOnNextDigit)
            setDisplayString("");

        String inputString = getDisplayString();

        // If the input string already contains a decimal point, don't
        //  do anything to it.
        if (inputString.indexOf(".") < 0)
            setDisplayString(new String(inputString + "."));
    }

    void processSignChange(){
        if (displayMode == INPUT_MODE)
        {
            String input = getDisplayString();

            if (input.length() > 0 && !input.equals("0"))
            {
                if (input.indexOf("-") == 0)
                    setDisplayString(input.substring(1));

                else
                    setDisplayString("-" + input);
            }

        }

        else if (displayMode == RESULT_MODE)
        {
            double numberInDisplay = getNumberInDisplay();

            if (numberInDisplay != 0)
                displayResult(-numberInDisplay);
        }
    }

    void clearAll() {
        setDisplayString("0");
        lastOperator = "0";
        lastNumber = 0;
        displayMode = INPUT_MODE;
        clearOnNextDigit = true;
    }

    void clearExisting(){
        setDisplayString("0");
        clearOnNextDigit = true;
        displayMode = INPUT_MODE;
    }

    double getNumberInDisplay() {
        String input = jlbOutput.getText();
        return Double.parseDouble(input);
    }

    void processOperator(String op) {
        if (displayMode != ERROR_MODE)
        {
            double numberInDisplay = getNumberInDisplay();

            if (!lastOperator.equals("0"))  
            {
                try
                {
                    double result = processLastOperator();
                    displayResult(result);
                    lastNumber = result;
                }

                catch (DivideByZeroException e)
                {
                }
            }

            else
            {
                lastNumber = numberInDisplay;
            }

            clearOnNextDigit = true;
            lastOperator = op;
        }
    }

    void processEquals(){
        double result = 0;

        if (displayMode != ERROR_MODE){
            try         
            {
                result = processLastOperator();
                displayResult(result);
            }

            catch (DivideByZeroException e) {
                displayError("Cannot divide by zero!");
            }

            lastOperator = "0";
        }
    }

    double processLastOperator() throws DivideByZeroException {
        double result = 0;
        double numberInDisplay = getNumberInDisplay();

        if (lastOperator.equals("/"))
        {
            if (numberInDisplay == 0)
                throw (new DivideByZeroException());

            result = lastNumber / numberInDisplay;
        }

        if (lastOperator.equals("*"))
            result = lastNumber * numberInDisplay;

        if (lastOperator.equals("-"))
            result = lastNumber - numberInDisplay;

        if (lastOperator.equals("+"))
            result = lastNumber + numberInDisplay;

        return result;
    }

    void displayResult(double result){
        setDisplayString(Double.toString(result));
        lastNumber = result;
        displayMode = RESULT_MODE;
        clearOnNextDigit = true;
    }

    void displayError(String errorMessage){
        setDisplayString(errorMessage);
        lastNumber = 0;
        displayMode = ERROR_MODE;
        clearOnNextDigit = true;
    }

    public static void main(String args[]) {
        Calculator calci = new Calculator();
        Container contentPane = calci.getContentPane();
//      contentPane.setLayout(new BorderLayout());
        calci.setTitle("Java Swing Calculator");
        calci.setSize(241, 217);
        calci.pack();
        calci.setLocation(400, 250);
        calci.setVisible(true);
        calci.setResizable(false);
    }

}       //End of Swing Calculator Class.

class DivideByZeroException extends Exception{
    public DivideByZeroException()
    {
        super();
    }

    public DivideByZeroException(String s)
    {
        super(s);
    }
}

class CustomABOUTDialog extends JDialog implements ActionListener {
    JButton jbnOk;

    CustomABOUTDialog(JFrame parent, String title, boolean modal){
        super(parent, title, modal);
        setBackground(Color.black);

        JPanel p1 = new JPanel(new FlowLayout(FlowLayout.CENTER));

        StringBuffer text = new StringBuffer();
        text.append("Calculator Information\n\n");
        text.append("Developer: Hemanth\n");
        text.append("Version:   1.0");

        JTextArea jtAreaAbout = new JTextArea(5, 21);
        jtAreaAbout.setText(text.toString());
        jtAreaAbout.setFont(new Font("Times New Roman", 1, 13));
        jtAreaAbout.setEditable(false);

        p1.add(jtAreaAbout);
        p1.setBackground(Color.red);
        getContentPane().add(p1, BorderLayout.CENTER);

        JPanel p2 = new JPanel(new FlowLayout(FlowLayout.CENTER));
        jbnOk = new JButton(" OK ");
        jbnOk.addActionListener(this);

        p2.add(jbnOk);
        getContentPane().add(p2, BorderLayout.SOUTH);

        setLocation(408, 270);
        setResizable(false);

        addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e)
                {
                    Window aboutDialog = e.getWindow();
                    aboutDialog.dispose();
                }
            }
        );

        pack();
    }

    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource() == jbnOk)  {
            this.dispose();
        }
    }

}

Proszę o pomoc - co z zawartością zrobić? Gdzie i kiedy wkleić? Jestem zielony na temat javy a muszę kalkulator napisać...
Pozdrawiam

Pozostało 580 znaków

2010-05-23 09:37

Rejestracja: 9 lat temu

Ostatnio: 9 lat temu

0

Kopiując czyjąś prace nie nauczysz się programować. Skoro już wybrałeś taką scieżkę to włóż trochę wysiłku i spróbuj go zrozumieć.

Pozostało 580 znaków

2010-05-23 12:03

Rejestracja: 9 lat temu

Ostatnio: 9 lat temu

0

Ja muszę to zaliczyć... Staram się zrozumieć apliakcję, ale w ogóle kalkulator się nie uruchamia...
Proszę o pomoc... Jak to uruchomić?

Pozostało 580 znaków

bo
2010-05-23 12:30
bo
0
  1. wklej całość do pliku o nazwie Calculator.java
  2. uruchom konsolę i przejdź do katalogu zawierającego plik Calculator.java
  3. skompiluj go javac Calculator.java
  4. uruchom java Calculator
  5. jeśli powyższego nie wiedziałeś dzień przed zaliczeniem to zrezygnuj ze studiów

Pozostało 580 znaków

2010-05-23 12:31

Rejestracja: 11 lat temu

Ostatnio: 3 miesiące temu

Lokalizacja: Poznań

0
Kluska napisał(a)

Jak to uruchomić?

Tak jak każdy projekt w Java ?

Może najpierw się zrozum podstawy Java zanim zaczniesz nam ściemniać że próbujesz zrozumieć podstawy tych źródłem.

Kluska napisał(a)

Ja muszę to zaliczyć...

To złe forum. www.zlecenia.przez.net albo dział Praca tutaj.
Za friko to pomagamy się tu dokształcać nie krętaczyć.


Pozostało 580 znaków

2010-05-23 13:01

Rejestracja: 9 lat temu

Ostatnio: 9 lat temu

0

Ale po mnie pojechałeś :P Widzę, że forum jest nie dla mnie ;)

Pozostało 580 znaków

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