Kalkulator - co z nim zrobić?

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

0

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

0

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

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
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.

0

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

1 użytkowników online, w tym zalogowanych: 0, gości: 1