Implementing a calculator

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السلام عليكم .

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ممكن تساعدوني فيه ؟

// Program creates a GUI that resembles a calculator.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class CalculatorFrame extends JFrame
{
private JButton[] keys;
private JPanel keyPadJPanel;
private JTextField lcdJTextField;
Object source; //<<<<<<<<<<<<<<<<<<
int op1, op2; //<<<<<<<<<<<<<<<<<<
char operator; //<<<<<<<<<<<<<<<<<<

// constructor sets up GUI
public CalculatorFrame()
{
super( "Calculator" );

lcdJTextField = new JTextField( 20 ); // create lcdJTextField
lcdJTextField.setEditable( false ); // allow user input
lcdJTextField.setText( "0" ); //<<<<<<<<<<<<<<<<<<
lcdJTextField.setBackground(Color.black);
lcdJTextField.setForeground(Color.white);

keys = new JButton[ 16 ]; // array keys contains 16 JButtons

//<<<< create the buttonHandler of class ButtonHandler
ButtonHandler buttonHandler =new ButtonHandler();

// initialize all digit key buttons
for ( int i = 0; i <= 9; i++ )
{
//<<< create the keys; use String.valueOf(i).
keys[i]= new JButton(String.valueOf(i));
//<<< add action listner
keys[i].addActionListener(buttonHandler);
}

// initialize all function key buttons
keys[ 10 ] = new JButton("/");
keys[ 10 ].addActionListener(buttonHandler); //<<<<<<<<<<<<<
keys[ 10 ].setToolTipText("Integer division.");


// key[11]
keys[ 11] = new JButton("*");
keys[ 11 ].addActionListener(buttonHandler); //<<<<<<<<<<<<<
keys[ 11 ].setToolTipText("Integer division.");

// key[12]
keys[ 12 ] = new JButton("-");
keys[ 12 ].addActionListener(buttonHandler); //<<<<<<<<<<<<<
keys[ 12 ].setToolTipText("Integer division.");
// key[13]
keys[ 13 ] = new JButton("+");
keys[ 13 ].addActionListener(buttonHandler); //<<<<<<<<<<<<<
keys[ 13 ].setToolTipText("Integer division.");

// key[14]
keys[ 14 ] = new JButton("=");
keys[ 14 ].addActionListener(buttonHandler); //<<<<<<<<<<<<<
keys[ 14 ].setToolTipText("Integer division.");

// key[15]
keys[ 15 ] = new JButton(".");
keys[ 15 ].addActionListener(buttonHandler); //<<<<<<<<<<<<<
keys[ 15 ].setToolTipText("Integer division.");


// set keyPadJPanel layout to grid layout
keyPadJPanel = new JPanel();
keyPadJPanel.setLayout( new GridLayout( 4, 4 ) );
//4rows w 4 colomn

// add buttons to keyPadJPanel panel
// 7, 8, 9, divide
for(int i=7; i<=10;i++)
keyPadJPanel.add(keys[i]);
// 4, 5, 6 multiply
for (int i=4;i<=6;i++)
keyPadJPanel.add(keys[i]);
keyPadJPanel.add(keys[11]);
// 1, 2, 3 subtract
for(int i=1; i<=3; i++)
keyPadJPanel.add(keys[i]);
keyPadJPanel.add(keys[12]);

keyPadJPanel.add(keys[0]);// 0
keyPadJPanel.add(keys[15]); // ., =, add
keyPadJPanel.add(keys[14]);
keyPadJPanel.add(keys[13]);


// add components to (default) border layout
add(keyPadJPanel, BorderLayout.CENTER);
add(lcdJTextField, BorderLayout.NORTH);

} // end CalculatorFrame constructor

private class ButtonHandler implements ActionListener //<<<<<<<<<<<<<
{
public void actionPerformed(ActionEvent event) {
JOptionPane.showMessageDialog(null,String.format(
"You pressed: %s", event.getActionCommand() ));

// lcdJTextField.setText(even.getActionCommand());
}

}
} // end class CalculatorFrame

[Caps Lock]

وهـاد التستر


// Program creates a GUI that resembles a calculator.
import javax.swing.JFrame;

public class Calculator
{
public static void main( String[] args )
{
CalculatorFrame calculatorFrame = new CalculatorFrame();
calculatorFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
calculatorFrame.setSize( 200, 225 ); // set frame size
calculatorFrame.setVisible( true ); // display frame
} // end main
} // end class Calculator