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Thread: Calculator problem

  1. #1
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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 09:02 AM.


  2. #2
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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.

  3. #3
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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.

  4. #4
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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.

  5. #5
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    Default Re: Calculator problem

    And you'd have to have

    button.addActionListener(this);

  6. #6
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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
                {
     
                }
            }

  7. #7
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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.

  8. #8
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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).

  9. The Following User Says Thank You to copeg For This Useful Post:

    The_Mexican (December 4th, 2010)

  10. #9
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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;

  11. #10
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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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    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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