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Thread: Calculator problem

  1. December 4th, 2010, 09:37 AM #1
    The_Mexican
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    Default Calculator problem

    Hi, I'm having a slight problem with a JPanel calculator. I have no idea what the source of the problem is, but it seems to be doing operations very strangely. For example, if you press the buttons in this order: 3, x, 3, =, -, 6, = You would think the output would be 3 but actually it's 27

    I really don't know where the problem is so here is the full runnable code:
    package JFrameClaculator;
 
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
 
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SpringLayout;
 
import layout.testing2;
 
public class Calculator extends JPanel implements ActionListener{
 
	public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
	static String textop;
	static String textop1;
	static int x;
	static int x1;
	static int x2;
	static int x3;
	public static final char LF = '\n';
	public static final char CR = '\r';
	static JTextField textField;
	protected static JButton b1;
	protected static JButton b2;
	protected static JButton b3;
	protected static JButton b4;
	protected static JButton b5;
	protected static JButton b6;
	protected static JButton b7;
	protected static JButton b8;
	protected static JButton b9;
	protected static JButton b10;
	protected static JButton b11;
	protected static JButton b12;
	protected static JButton b13;
	protected static JButton b14;
	protected static JButton b15;
	protected static JButton b16;
	private static void createAndShowGUI() {
		JFrame frame = new JFrame("Calculator v2.1");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container contentPane = frame.getContentPane();
        SpringLayout layout = new SpringLayout();
        contentPane.setLayout(layout);
        textField = new JTextField("", 17);
        textField.setEditable(false);
        b1 = new JButton("1");
        b1.setVerticalTextPosition(AbstractButton.CENTER);
        b1.setHorizontalTextPosition(AbstractButton.LEADING);
        b1.addActionListener(new Calculator());
        b1.setActionCommand("1");
        b2 = new JButton("2");
        b2.setVerticalTextPosition(AbstractButton.CENTER);
        b2.setHorizontalTextPosition(AbstractButton.LEADING);
        b2.addActionListener(new Calculator());
        b2.setActionCommand("2");
        b3 = new JButton("3");
        b3.setVerticalTextPosition(AbstractButton.CENTER);
        b3.setHorizontalTextPosition(AbstractButton.LEADING);
        b3.addActionListener(new Calculator());
        b3.setActionCommand("3");
        b4 = new JButton("4");
        b4.setVerticalTextPosition(AbstractButton.CENTER);
        b4.setHorizontalTextPosition(AbstractButton.LEADING);
        b4.addActionListener(new Calculator());
        b4.setActionCommand("4");
        b5 = new JButton("5");
        b5.setVerticalTextPosition(AbstractButton.CENTER);
        b5.setHorizontalTextPosition(AbstractButton.LEADING);
        b5.addActionListener(new Calculator());
        b5.setActionCommand("5");
        b6 = new JButton("6");
        b6.setVerticalTextPosition(AbstractButton.CENTER);
        b6.setHorizontalTextPosition(AbstractButton.LEADING);
        b6.addActionListener(new Calculator());
        b6.setActionCommand("6");
        b7 = new JButton("7");
        b7.setVerticalTextPosition(AbstractButton.CENTER);
        b7.setHorizontalTextPosition(AbstractButton.LEADING);
        b7.addActionListener(new Calculator());
        b7.setActionCommand("7");
        b8 = new JButton("8");
        b8.setVerticalTextPosition(AbstractButton.CENTER);
        b8.setHorizontalTextPosition(AbstractButton.LEADING);
        b8.addActionListener(new Calculator());
        b8.setActionCommand("8");
        b9 = new JButton("9");
        b9.setVerticalTextPosition(AbstractButton.CENTER);
        b9.setHorizontalTextPosition(AbstractButton.LEADING);
        b9.addActionListener(new Calculator());
        b9.setActionCommand("9");
        b10 = new JButton("0");
        b10.setVerticalTextPosition(AbstractButton.CENTER);
        b10.setHorizontalTextPosition(AbstractButton.LEADING);
        b10.addActionListener(new Calculator());
        b10.setActionCommand("0");
        b11 = new JButton("+");
        b11.setVerticalTextPosition(AbstractButton.CENTER);
        b11.setHorizontalTextPosition(AbstractButton.LEADING);
        b11.addActionListener(new Calculator());
        b11.setActionCommand("+");
        b12 = new JButton("-");
        b12.setVerticalTextPosition(AbstractButton.CENTER);
        b12.setHorizontalTextPosition(AbstractButton.LEADING);
        b12.addActionListener(new Calculator());
        b12.setActionCommand("-");
        b13 = new JButton("x");
        b13.setVerticalTextPosition(AbstractButton.CENTER);
        b13.setHorizontalTextPosition(AbstractButton.LEADING);
        b13.addActionListener(new Calculator());
        b13.setActionCommand("x");
        b14 = new JButton("/");
        b14.setVerticalTextPosition(AbstractButton.CENTER);
        b14.setHorizontalTextPosition(AbstractButton.LEADING);
        b14.addActionListener(new Calculator());
        b14.setActionCommand("/");
        b15 = new JButton("C");
        b15.setVerticalTextPosition(AbstractButton.CENTER);
        b15.setHorizontalTextPosition(AbstractButton.LEADING);
        b15.addActionListener(new Calculator());
        b15.setActionCommand("C");
        b16 = new JButton("=");
        b16.setVerticalTextPosition(AbstractButton.CENTER);
        b16.setHorizontalTextPosition(AbstractButton.LEADING);
        b16.addActionListener(new Calculator());
        b16.setActionCommand("=");
        contentPane.add(textField);
        contentPane.add(b1);
        contentPane.add(b2);
        contentPane.add(b3);
        contentPane.add(b4);
        contentPane.add(b5);
        contentPane.add(b6);
        contentPane.add(b7);
        contentPane.add(b8);
        contentPane.add(b9);
        contentPane.add(b10);
        contentPane.add(b11);
        contentPane.add(b12);
        contentPane.add(b13);
        contentPane.add(b14);
        contentPane.add(b15);
        contentPane.add(b16);
        b1.setPreferredSize(new Dimension(45, 30));
        b2.setPreferredSize(new Dimension(45, 30));
        b3.setPreferredSize(new Dimension(45, 30));
        b4.setPreferredSize(new Dimension(45, 30));
        b5.setPreferredSize(new Dimension(45, 30));
        b6.setPreferredSize(new Dimension(45, 30));
        b7.setPreferredSize(new Dimension(45, 30));
        b8.setPreferredSize(new Dimension(45, 30));
        b9.setPreferredSize(new Dimension(45, 30));
        b10.setPreferredSize(new Dimension(45, 30));
        b11.setPreferredSize(new Dimension(45, 30));
        b12.setPreferredSize(new Dimension(45, 30));
        b13.setPreferredSize(new Dimension(45, 30));
        b14.setPreferredSize(new Dimension(45, 30));
        b15.setPreferredSize(new Dimension(95, 30));
        b16.setPreferredSize(new Dimension(195, 30));
        //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, textField,
                             30,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, textField,
                             10,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b1,
                             30,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b1,
                             110,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
        //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b2,
                             80,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b2,
                             110,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b3,
                             130,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b3,
                             110,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b4,
                             30,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b4,
                             75,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b5,
                             80,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b5,
                             75,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b6,
                             130,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b6,
                             75,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b7,
                             30,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b7,
                             40,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b8,
                             80,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b8,
                             40,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b9,
                             130,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b9,
                             40,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b10,
                             30,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b10,
                             145,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b11,
                             180,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b11,
                             40,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b12,
                             180,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b12,
                             75,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b13,
                             180,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b13,
                             110,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b14,
                             180,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b14,
                             145,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b15,
                             80,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b15,
                             145,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
      //SET HEIGHT/WIDTH
        layout.putConstraint(SpringLayout.WEST, b16,
                             30,
                             SpringLayout.WEST, contentPane);
        layout.putConstraint(SpringLayout.NORTH, b16,
                             180,
                             SpringLayout.NORTH, contentPane);
        //END SET HEIGHT/WIDTH
        frame.pack();
        frame.setSize(263, 259);
        frame.setVisible(true);
	}
	public void actionPerformed(ActionEvent e) {
		if (e.getSource()==b1) {
			String text = textField.getText();
			textField.setText(text+"1");
		}
		if (e.getSource()==b2) {
			String text = textField.getText();
			textField.setText(text+"2");
		}
		if (e.getSource()==b3) {
			String text = textField.getText();
			textField.setText(text+"3");
		}
		if (e.getSource()==b4) {
			String text = textField.getText();
			textField.setText(text+"4");
		}
		if (e.getSource()==b5) {
			String text = textField.getText();
			textField.setText(text+"5");
		}
		if (e.getSource()==b6) {
			String text = textField.getText();
			textField.setText(text+"6");
		}
		if (e.getSource()==b7) {
			String text = textField.getText();
			textField.setText(text+"7");
		}
		if (e.getSource()==b8) {
			String text = textField.getText();
			textField.setText(text+"8");
		}
		if (e.getSource()==b9) {
			String text = textField.getText();
			textField.setText(text+"9");
		}
		if (e.getSource()==b10) {
			String text = textField.getText();
			textField.setText(text+"0");
		}
		if (e.getSource()==b11) {
			textop = textField.getText();
			textField.setText("");
			x = x + 1;
		}
		if (e.getSource()==b12) {
			textop = textField.getText();
			textField.setText("");
			x1 = x1 + 1;
		}
		if (e.getSource()==b13) {
			textop = textField.getText();
			textField.setText("");
			x2 = x2 + 1;
		}
		if (e.getSource()==b14) {
			textop = textField.getText();
			textField.setText("");
			x3 = x3 + 1;
		}
		if (e.getSource()==b15) {
			String str = textField.getText();
			if (str == null) {
 
		      }
		      int strLen = str.length();
		      if(strLen != 0){
		      if (strLen < 2) {
		          textField.setText("");
		      }
		      int lastIdx = strLen - 1;
		      String ret = str.substring(0, lastIdx);
		      char last = str.charAt(lastIdx);
		      if (last == LF) {
		          if (ret.charAt(lastIdx - 1) == CR) {
		              textField.setText(ret.substring(0, lastIdx - 1));
		          }
		      }
		      textField.setText(ret);
			}
		}
		if (e.getSource()==b16) {
			if(x % 2 != 0)
			{
				textop1 = textField.getText();
				int op = Integer.parseInt(textop);
				int op1 = Integer.parseInt(textop1);
				int opFinal = op+op1;
				String Final = Integer.toString(opFinal);
				textField.setText(Final);
			}
			if(x1 % 2 != 0)
			{
				textop1 = textField.getText();
				int op = Integer.parseInt(textop);
				int op1 = Integer.parseInt(textop1);
				int opFinal = op-op1;
				String Final = Integer.toString(opFinal);
				textField.setText(Final);
			}
			if(x2 % 2 != 0)
			{
				textop1 = textField.getText();
				int op = Integer.parseInt(textop);
				int op1 = Integer.parseInt(textop1);
				int opFinal = op*op1;
				String Final = Integer.toString(opFinal);
				textField.setText(Final);
			}
			if(x3 % 2 != 0)
			{
				textop1 = textField.getText();
				int op = Integer.parseInt(textop);
				int op1 = Integer.parseInt(textop1);
				int opFinal = op/op1;
				String Final = Integer.toString(opFinal);
				textField.setText(Final);
			}
			else
			{
 
			}
		}
	}
 
}

    I'm handing this in quite soon so any quick help would be greatly appreciated. Thanks!
    Last edited by The_Mexican; December 4th, 2010 at 10:02 AM.
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  2. Default Related threads:

  3. December 4th, 2010, 12:20 PM #2
    javapenguin
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    Default Re: Calculator problem

    textField.setText(text+"3")

    I doubt that's adding anything.

    All it appears to do is append a 3 to the String text.
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  4. December 4th, 2010, 12:22 PM #3
    javapenguin
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    Default Re: Calculator problem

    Oh....wait, that's what it's supposed to do.

    But I noticed that the word "Final" was highlighted as a keyword or as a class.
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  5. December 4th, 2010, 12:27 PM #4
    javapenguin
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    Default Re: Calculator problem

    On a side note, you could just define all your buttons in a constructor.

    But if you do that, they probably shouldn't be static anymore.
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  6. December 4th, 2010, 12:27 PM #5
    javapenguin
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    Default Re: Calculator problem

    And you'd have to have

    button.addActionListener(this);
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  7. December 4th, 2010, 12:30 PM #6
    javapenguin
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    Default Re: Calculator problem

    I'm pretty sure your error is in this part
    public void actionPerformed(ActionEvent e) {
        if (e.getSource()==b1) {
            String text = textField.getText();
            textField.setText(text+"1");
        }
        if (e.getSource()==b2) {
            String text = textField.getText();
            textField.setText(text+"2");
        }
        if (e.getSource()==b3) {
            String text = textField.getText();
            textField.setText(text+"3");
        }
        if (e.getSource()==b4) {
            String text = textField.getText();
            textField.setText(text+"4");
        }
        if (e.getSource()==b5) {
            String text = textField.getText();
            textField.setText(text+"5");
        }
        if (e.getSource()==b6) {
            String text = textField.getText();
            textField.setText(text+"6");
        }
        if (e.getSource()==b7) {
            String text = textField.getText();
            textField.setText(text+"7");
        }
        if (e.getSource()==b8) {
            String text = textField.getText();
            textField.setText(text+"8");
        }
        if (e.getSource()==b9) {
            String text = textField.getText();
            textField.setText(text+"9");
        }
        if (e.getSource()==b10) {
            String text = textField.getText();
            textField.setText(text+"0");
        }
        if (e.getSource()==b11) {
            textop = textField.getText();
            textField.setText("");
            x = x + 1;
        }
        if (e.getSource()==b12) {
            textop = textField.getText();
            textField.setText("");
            x1 = x1 + 1;
        }
        if (e.getSource()==b13) {
            textop = textField.getText();
            textField.setText("");
            x2 = x2 + 1;
        }
        if (e.getSource()==b14) {
            textop = textField.getText();
            textField.setText("");
            x3 = x3 + 1;
        }
        if (e.getSource()==b15) {
            String str = textField.getText();
            if (str == null) {
 
              }
              int strLen = str.length();
              if(strLen != 0){
              if (strLen < 2) {
                  textField.setText("");
              }
              int lastIdx = strLen - 1;
              String ret = str.substring(0, lastIdx);
              char last = str.charAt(lastIdx);
              if (last == LF) {
                  if (ret.charAt(lastIdx - 1) == CR) {
                      textField.setText(ret.substring(0, lastIdx - 1));
                  }
              }
              textField.setText(ret);
            }
        }
        if (e.getSource()==b16) {
            if(x % 2 != 0)
            {
                textop1 = textField.getText();
                int op = Integer.parseInt(textop);
                int op1 = Integer.parseInt(textop1);
                int opFinal = op+op1;
                String Final = Integer.toString(opFinal);
                textField.setText(Final);
            }
            if(x1 % 2 != 0)
            {
                textop1 = textField.getText();
                int op = Integer.parseInt(textop);
                int op1 = Integer.parseInt(textop1);
                int opFinal = op-op1;
                String Final = Integer.toString(opFinal);
                textField.setText(Final);
            }
            if(x2 % 2 != 0)
            {
                textop1 = textField.getText();
                int op = Integer.parseInt(textop);
                int op1 = Integer.parseInt(textop1);
                int opFinal = op*op1;
                String Final = Integer.toString(opFinal);
                textField.setText(Final);
            }
            if(x3 % 2 != 0)
            {
                textop1 = textField.getText();
                int op = Integer.parseInt(textop);
                int op1 = Integer.parseInt(textop1);
                int opFinal = op/op1;
                String Final = Integer.toString(opFinal);
                textField.setText(Final);
            }
            else
            {
 
            }
        }
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  8. December 4th, 2010, 12:34 PM #7
    javapenguin
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    Default Re: Calculator problem

    x = x + 1;

    What is this doing?

    How is that value being saved?

    I can't find where x was initialized.
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  9. December 4th, 2010, 12:35 PM #8
    copeg
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    Default Re: Calculator problem

    This is where a debugger (or println statements) comes in very handy so one can step through the logic (as does posting a short compilable code snipped as you have). I'm not fully sure about the logic and your x,x1,x2...variables, but the math at that point leads to both
    if(x1 % 2 != 0)
    and
    if(x2 % 2 != 0)
    being entered, the result is the second value being evaluated and used (which is 27).
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    The_Mexican (December 4th, 2010)
  11. December 4th, 2010, 12:37 PM #9
    javapenguin
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    Default Re: Calculator problem

    How about this for times


    int whatever = Integer.parseInt(textField.getText());

    textField.setText(" ");

    // now here's where I'm not sure what'll happen

    int whatever2 = Integer.parseInt(textField.getText());

    int whatever3 = whatever * whatever2;
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  12. December 4th, 2010, 12:59 PM #10
    The_Mexican
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    Default Re: Calculator problem

    Quote Originally Posted by copeg View Post
    This is where a debugger (or println statements) comes in very handy so one can step through the logic (as does posting a short compilable code snipped as you have). I'm not fully sure about the logic and your x,x1,x2...variables, but the math at that point leads to both
    if(x1 % 2 != 0)
    and
    if(x2 % 2 != 0)
    being entered, the result is the second value being evaluated and used (which is 27).
    I see, so I need to make it so that only one of the x if statements are true at a time...
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  13. December 4th, 2010, 01:01 PM #11
    The_Mexican
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    Default Re: Calculator problem

    Quote Originally Posted by javapenguin View Post
    How about this for times


    int whatever = Integer.parseInt(textField.getText());

    textField.setText(" ");

    // now here's where I'm not sure what'll happen

    int whatever2 = Integer.parseInt(textField.getText());

    int whatever3 = whatever * whatever2;
    All I'm doing is making the string which the user entered into an int so I can multiply it with the other string that he entered.
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