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Lord_Destros
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Join Date: Jul 2004
Location: With stupid.
Old 06-13-2006 , 08:56   Java help
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I know there are probably many problems with this code as well as the way I did it, but the main thing I can't figure out to do is set more than one digit in the Text area when pushing buttons (if i push 1, then 2, then 3, 3 appears instead of 123).

Obviously this is a calculator program...........

I tried making it so that each time someone pushes a button, it adds that number to a string which it then displays.

Yes, I know the operation buttons do nothing and the calculator layout itself is pretty crappy.


Code:
import java.awt.*; import javax.swing.*; import java.awt.event.*; public class CalculatorEdit extends JFrame implements ActionListener {     public static final int WIDTH = 600;     public static final int HEIGHT = 200;     private JTextField inputOutputField;         public static void main(String[] args)     {         Calculator guiWithPanel = new Calculator();         guiWithPanel.setVisible(true);     }     public CalculatorEdit()     {         inputOutputField = new JTextField("0", 30);         setSize(WIDTH, HEIGHT);         addWindowListener(new WindowDestroyer());         setTitle("Gabens Miniature Calculator");         Container contentPane = getContentPane();         JPanel operationPanel = new JPanel();         JPanel buttonPanel = new JPanel();         contentPane.setLayout(new BorderLayout());                 JButton zeroButton = new JButton("0");         zeroButton.addActionListener(this);         buttonPanel.add(zeroButton);                 JButton oneButton = new JButton("1");         oneButton.addActionListener(this);         buttonPanel.add(oneButton);         JButton twoButton = new JButton("2");         twoButton.addActionListener(this);         buttonPanel.add(twoButton);                 JButton threeButton = new JButton("3");         threeButton.addActionListener(this);         buttonPanel.add(threeButton);                 JButton fourButton = new JButton("4");         fourButton.addActionListener(this);         buttonPanel.add(fourButton);                 JButton fiveButton = new JButton("5");         fiveButton.addActionListener(this);         buttonPanel.add(fiveButton);                 JButton sixButton = new JButton("6");         sixButton.addActionListener(this);         buttonPanel.add(sixButton);                 JButton sevenButton = new JButton("7");         sevenButton.addActionListener(this);         buttonPanel.add(sevenButton);                 JButton eightButton = new JButton("8");         eightButton.addActionListener(this);         buttonPanel.add(eightButton);                 JButton nineButton = new JButton("9");         nineButton.addActionListener(this);         buttonPanel.add(nineButton);         contentPane.add(buttonPanel, BorderLayout.SOUTH);                 JButton addButton = new JButton("+");         addButton.addActionListener(this);         operationPanel.add(addButton);                 JButton subtractButton = new JButton("-");         subtractButton.addActionListener(this);         operationPanel.add(subtractButton);                 JButton multiplyButton = new JButton("*");         multiplyButton.addActionListener(this);         operationPanel.add(multiplyButton);                 JButton divideButton = new JButton("/");         divideButton.addActionListener(this);         operationPanel.add(divideButton);                 JButton resetButton = new JButton("Reset");         resetButton.addActionListener(this);         operationPanel.add(resetButton);                 JButton equalButton = new JButton("=");         equalButton.addActionListener(this);         operationPanel.add(equalButton);                 contentPane.add(operationPanel, BorderLayout.NORTH);     }     public void actionPerformed(ActionEvent e)     {        Container contentPane = getContentPane();         String a = "";         String b = "";         int answer = 0;         double operation = 0;         if (e.getActionCommand().equals("0"))         {             if (operation == 0)             {                 a = a + "0";                 inputOutputField.setText(a);             }             else             {                 b = b + "0";                 inputOutputField.setText(b);             }         }         else if (e.getActionCommand().equals("1"))         {            if (operation == 0)             {                 a = a + "1";                 inputOutputField.setText(a);             }             else             {                 b = b + "1";                 inputOutputField.setText(b);             }         }         else if (e.getActionCommand().equals("2"))         {            if (operation == 0)             {                 a = a + "2";                 inputOutputField.setText(a);             }             else             {                 b = b + "2";                 inputOutputField.setText(b);             }         }         else if (e.getActionCommand().equals("3"))         {            if (operation == 0)             {                 a = a + "3";                 inputOutputField.setText(a);             }             else             {                 b = b + "3";                 inputOutputField.setText(b);             }         }         else if (e.getActionCommand().equals("4"))         {            if (operation == 0)             {                 a = a + "4";                 inputOutputField.setText(a);             }             else             {                 b = b + "4";                 inputOutputField.setText(b);             }         }         else if (e.getActionCommand().equals("5"))         {            if (operation == 0)             {                 a = a + "5";                 inputOutputField.setText(a);             }             else             {                 b = b + "5";                 inputOutputField.setText(b);             }         }         else if (e.getActionCommand().equals("6"))         {            if (operation == 0)             {                 a = a + "6";                 inputOutputField.setText(a);             }             else             {                 b = b + "6";                 inputOutputField.setText(b);             }         }         else if (e.getActionCommand().equals("7"))         {            if (operation == 0)             {                 a = a + "7";                 inputOutputField.setText(a);             }             else             {                 b = b + "7";                 inputOutputField.setText(b);             }         }         else if (e.getActionCommand().equals("8"))         {            if (operation == 0)             {                 a = a + "8";                 inputOutputField.setText(a);             }             else             {                 b = b + "8";                 inputOutputField.setText(b);             }         }                 else if (e.getActionCommand().equals("9"))         {            if (operation == 0)             {                 a = a + "9";                 inputOutputField.setText(a);             }             else             {                 b = b + "9";                 inputOutputField.setText(b);             }         }                 else if (e.getActionCommand().equals("+"))         {             operation = 1;         }         else if (e.getActionCommand().equals("-"))         {             operation = 2;         }         else if (e.getActionCommand().equals("*"))         {             operation = 3;         }         else if (e.getActionCommand().equals("/"))         {             operation = 4;         }         else if (e.getActionCommand().equals("="))         {             if (operation == 1);             {                 answer = (Integer.parseInt(a) + Integer.parseInt(b));                 inputOutputField.setText("" + answer);             }                         if (operation == 2);             {                 answer = (Integer.parseInt(a) - Integer.parseInt(b));                 inputOutputField.setText("" + answer);             }             if (operation == 3);             {                 answer = (Integer.parseInt(a) * Integer.parseInt(b));                 inputOutputField.setText("" + answer);             }             if (operation == 4);             {                 answer = (Integer.parseInt(a) / Integer.parseInt(b));                 inputOutputField.setText("" + answer);             }         }         else if (e.getActionCommand().equals("Reset"))         {             operation = 0;             a = "";             b = "";             inputOutputField.setText("");         }         else             System.out.println("Error in button interface.");     } }
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