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  1. #1
    Rose88 is offline Member
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    Default Basic Calculator

    my homework is to build a calculator with these conditions:
    1. to add blue and red buttons and color the panel.
    2. add a + button which calculates numbers .
    3. add = button which displaying the result.
    4. add C button which clears the result field.
    5. when u press X the window closes and write a suitable message.

    my problem was when i'm doing 1+2+3+4 it only counts 3+4 and forgets the first numbers and counts just the last two. my code is like this:

    /**
    * JFarme package
    */
    package org.eclipse.swingapp;

    import javax.swing.JPanel;
    import javax.swing.JFrame;
    import javax.swing.JTextField;
    import javax.swing.JButton;

    import java.awt.Color;
    import java.awt.GridBagLayout;
    import java.awt.GridBagConstraints;
    import java.awt.Insets;
    import java.awt.Dimension;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;

    public class Calculator extends JFrame implements ActionListener{

    private static final long serialVersionUID = 1L;

    private final int INPUT_MODE = 0;
    private final int RESULT_MODE = 1;
    private int displayMode;
    private boolean clearOnNextDigit=true;
    private int lastNumber,result;
    private String lastOperator; // @jve:decl-index=0:

    private JPanel jContentPane = null;

    private JButton but1 = null;

    private JButton but2 = null;

    private JButton but3 = null;

    private JButton but4 = null;

    private JButton but5 = null;

    private JButton but6 = null;

    private JButton but7 = null;

    private JButton but8 = null;

    private JButton but9 = null;

    private JButton but0 = null;

    private JButton butPlus = null;

    private JButton butEqual = null;

    private JTextField jTextField = null;

    private JButton butC = null;

    private JButton ButRed = null;

    private JButton butBlue = null;

    /**
    * This is the default constructor
    */
    public Calculator() {
    super();
    initialize();
    }

    /**
    * This method initializes this
    *
    * @return void
    */
    private void initialize() {
    this.setSize(300, 200);
    this.setContentPane(getJContentPane());
    this.setTitle("Calculator");
    }

    /**
    * This method initializes jContentPane
    *
    * @return javax.swing.JPanel
    */
    private JPanel getJContentPane() {
    if (jContentPane == null) {
    GridBagConstraints gridBagConstraints17 = new GridBagConstraints();
    gridBagConstraints17.gridx = 4;
    gridBagConstraints17.gridy = 4;
    GridBagConstraints gridBagConstraints16 = new GridBagConstraints();
    gridBagConstraints16.gridx = 4;
    gridBagConstraints16.gridy = 5;
    GridBagConstraints gridBagConstraints14 = new GridBagConstraints();
    gridBagConstraints14.gridx = 1;
    gridBagConstraints14.gridy = 5;
    GridBagConstraints gridBagConstraints13 = new GridBagConstraints();
    gridBagConstraints13.fill = GridBagConstraints.VERTICAL;
    gridBagConstraints13.gridy = 1;
    gridBagConstraints13.weightx = 1.0;
    gridBagConstraints13.insets = new Insets(0, 0, 2, 2);
    gridBagConstraints13.gridx = 4;
    GridBagConstraints gridBagConstraints11 = new GridBagConstraints();
    gridBagConstraints11.gridx = 0;
    gridBagConstraints11.gridy = 4;
    GridBagConstraints gridBagConstraints10 = new GridBagConstraints();
    gridBagConstraints10.gridx = 2;
    gridBagConstraints10.gridy = 4;
    GridBagConstraints gridBagConstraints9 = new GridBagConstraints();
    gridBagConstraints9.gridx = 1;
    gridBagConstraints9.gridy = 4;
    GridBagConstraints gridBagConstraints8 = new GridBagConstraints();
    gridBagConstraints8.gridx = 2;
    gridBagConstraints8.gridy = 3;
    GridBagConstraints gridBagConstraints7 = new GridBagConstraints();
    gridBagConstraints7.gridx = 1;
    gridBagConstraints7.gridy = 3;
    GridBagConstraints gridBagConstraints6 = new GridBagConstraints();
    gridBagConstraints6.gridx = 0;
    gridBagConstraints6.gridy = 3;
    GridBagConstraints gridBagConstraints5 = new GridBagConstraints();
    gridBagConstraints5.gridx = 2;
    gridBagConstraints5.gridy = 1;
    GridBagConstraints gridBagConstraints4 = new GridBagConstraints();
    gridBagConstraints4.gridx = 1;
    gridBagConstraints4.gridy = 1;
    GridBagConstraints gridBagConstraints3 = new GridBagConstraints();
    gridBagConstraints3.gridx = 0;
    gridBagConstraints3.gridy = 1;
    GridBagConstraints gridBagConstraints2 = new GridBagConstraints();
    gridBagConstraints2.gridx = 2;
    gridBagConstraints2.gridy = 0;
    GridBagConstraints gridBagConstraints1 = new GridBagConstraints();
    gridBagConstraints1.gridx = 1;
    gridBagConstraints1.gridy = 0;
    GridBagConstraints gridBagConstraints = new GridBagConstraints();
    gridBagConstraints.gridx = 0;
    gridBagConstraints.gridy = 0;
    jContentPane = new JPanel();
    jContentPane.setLayout(new GridBagLayout());
    jContentPane.add(getBut1(), gridBagConstraints);
    jContentPane.add(getBut2(), gridBagConstraints1);
    jContentPane.add(getBut3(), gridBagConstraints2);
    jContentPane.add(getBut4(), gridBagConstraints3);
    jContentPane.add(getBut5(), gridBagConstraints4);
    jContentPane.add(getBut6(), gridBagConstraints5);
    jContentPane.add(getBut7(), gridBagConstraints6);
    jContentPane.add(getBut8(), gridBagConstraints7);
    jContentPane.add(getBut9(), gridBagConstraints8);
    jContentPane.add(getBut0(), gridBagConstraints9);
    jContentPane.add(getButPlus(), gridBagConstraints10);
    jContentPane.add(getButEqual(), gridBagConstraints11);
    jContentPane.add(getJTextField(), gridBagConstraints13);
    jContentPane.add(getButC(), gridBagConstraints14);
    jContentPane.add(getButRed(), gridBagConstraints16);
    jContentPane.add(getButBlue(), gridBagConstraints17);
    this.ButRed.addActionListener(this);
    this.butBlue.addActionListener(this);
    this.butC.addActionListener(this);
    this.butPlus.addActionListener(this);
    this.butEqual.addActionListener(this);
    this.but0.addActionListener(this);
    this.but1.addActionListener(this);
    this.but2.addActionListener(this);
    this.but3.addActionListener(this);
    this.but4.addActionListener(this);
    this.but5.addActionListener(this);
    this.but6.addActionListener(this);
    this.but7.addActionListener(this);
    this.but8.addActionListener(this);
    this.but9.addActionListener(this);
    }
    return jContentPane;
    }

    /**
    * This method initializes but1
    *
    * @return javax.swing.JButton
    */
    private JButton getBut1() {
    if (but1 == null) {
    but1 = new JButton();
    but1.setText("1");
    }
    return but1;
    }

    /**
    * This method initializes but2
    *
    * @return javax.swing.JButton
    */
    private JButton getBut2() {
    if (but2 == null) {
    but2 = new JButton();
    but2.setText("2");
    }
    return but2;
    }

    /**
    * This method initializes but3
    *
    * @return javax.swing.JButton
    */
    private JButton getBut3() {
    if (but3 == null) {
    but3 = new JButton();
    but3.setText("3");
    }
    return but3;
    }

    /**
    * This method initializes but4
    *
    * @return javax.swing.JButton
    */
    private JButton getBut4() {
    if (but4 == null) {
    but4 = new JButton();
    but4.setText("4");
    }
    return but4;
    }

    /**
    * This method initializes but5
    *
    * @return javax.swing.JButton
    */
    private JButton getBut5() {
    if (but5 == null) {
    but5 = new JButton();
    but5.setText("5");
    }
    return but5;
    }

    /**
    * This method initializes but6
    *
    * @return javax.swing.JButton
    */
    private JButton getBut6() {
    if (but6 == null) {
    but6 = new JButton();
    but6.setText("6");
    }
    return but6;
    }

    /**
    * This method initializes but7
    *
    * @return javax.swing.JButton
    */
    private JButton getBut7() {
    if (but7 == null) {
    but7 = new JButton();
    but7.setText("7");
    }
    return but7;
    }

    /**
    * This method initializes but8
    *
    * @return javax.swing.JButton
    */
    private JButton getBut8() {
    if (but8 == null) {
    but8 = new JButton();
    but8.setText("8");
    }
    return but8;
    }

    /**
    * This method initializes but9
    *
    * @return javax.swing.JButton
    */
    private JButton getBut9() {
    if (but9 == null) {
    but9 = new JButton();
    but9.setText("9");
    }
    return but9;
    }

    /**
    * This method initializes but0
    *
    * @return javax.swing.JButton
    */
    private JButton getBut0() {
    if (but0 == null) {
    but0 = new JButton();
    but0.setText("0");
    }
    return but0;
    }

    /**
    * This method initializes butPlus
    *
    * @return javax.swing.JButton
    */
    private JButton getButPlus() {
    if (butPlus == null) {
    butPlus = new JButton();
    butPlus.setText("+");
    }
    return butPlus;
    }

    /**
    * This method initializes butEqual
    *
    * @return javax.swing.JButton
    */
    private JButton getButEqual() {
    if (butEqual == null) {
    butEqual = new JButton();
    butEqual.setName("");
    butEqual.setText("=");
    }
    return butEqual;
    }

    /**
    * This method initializes jTextField
    *
    * @return javax.swing.JTextField
    */
    private JTextField getJTextField() {
    if (jTextField == null) {
    jTextField = new JTextField();
    jTextField.setPreferredSize(new Dimension(80, 20));
    }
    return jTextField;
    }

    /**
    * This method initializes butC
    *
    * @return javax.swing.JButton
    */
    private JButton getButC() {
    if (butC == null) {
    butC = new JButton();
    butC.setText("C");
    }
    return butC;
    }

    /**
    * This method initializes ButRed
    *
    * @return javax.swing.JButton
    */
    private JButton getButRed() {
    if (ButRed == null) {
    ButRed = new JButton();
    ButRed.setName("");
    ButRed.setPreferredSize(new Dimension(59, 26));
    ButRed.setText("Red");
    }
    return ButRed;
    }

    /**
    * This method initializes butBlue
    *
    * @return javax.swing.JButton
    */
    private JButton getButBlue() {
    if (butBlue == null) {
    butBlue = new JButton();
    butBlue.setText("Blue");
    }
    return butBlue;
    }
    /**
    * This method clears the result field
    *
    */
    private void clearAll() {
    setDisplayString("0");
    lastOperator = "0";
    lastNumber = 0;
    displayMode =0;
    result=0;
    clearOnNextDigit = true;
    }
    /**
    *
    * @param String s
    */
    private void setDisplayString(String s){
    this.jTextField.setText(s);
    }
    /**
    *
    * @return text
    */
    private String getDisplayString (){
    return this.jTextField.getText();
    }
    /**
    *
    * @param digit
    */
    private void addDigitToDisplay(int digit){
    if (clearOnNextDigit)
    setDisplayString("");

    String inputString = getDisplayString();
    setDisplayString(inputString+ digit);
    displayMode = INPUT_MODE;
    clearOnNextDigit = false;
    }
    /**
    *
    * @return int
    */
    private int getNumberInDisplay() {
    String input = this.jTextField.getText();
    return Integer.parseInt(input);
    }
    /**
    *
    * @return result
    */
    private int equalOperation(){
    result = lastNumber + getNumberInDisplay();
    lastOperator = "0";
    return result;
    }
    /**
    * Performe Action
    */
    public void actionPerformed(ActionEvent ev) {
    // TODO Auto-generated method stub
    String arg= ev.getActionCommand();
    if (arg.equals ("Red"))
    this.jContentPane.setBackground(Color.red);
    else if (arg.equals ("Blue"))
    this.jContentPane.setBackground(Color.blue);
    else if(arg.equals("C"))
    this.clearAll();
    else if(arg.equals("+")){
    lastNumber=getNumberInDisplay();
    clearOnNextDigit = true;
    lastOperator = "+";
    }
    else if(arg.equals("=")){
    displayResult(this.equalOperation());
    }
    else{
    addDigitToDisplay(Integer.parseInt(arg));
    }

    }
    /**
    *
    * @param i
    */
    private void displayResult(int i) {
    // TODO Auto-generated method stub
    setDisplayString(Integer.toString(result));
    lastNumber = result;
    clearOnNextDigit = true;
    }
    /**
    * Main Method
    * @param args
    */

    public static void main(String[] args){
    Calculator c=new Calculator();
    c.setVisible(true);
    }


    }

  2. #2
    OrangeDog's Avatar
    OrangeDog is offline Senior Member
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    Cambridge, UK
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    Default

    Need to make sure lastNumber gets updated with the value of result.
    Don't forget to mark threads as [SOLVED] and give reps to helpful posts.
    How To Ask Questions The Smart Way

  3. #3
    Bluefox815 is offline Member
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    Default

    I cannot even find the code that adds together all of the entered numbers. Can you add a comment line that shows where this is (maybe write it in all caps or something to make it stand out)? Also, it's recommended you post code using code tags &91;code&93; // your code here &91;/code&93; and format it using tabs. Here is an example of the resulting code.

    Java Code:
    /**
    * JFarme package
    */
    package org.eclipse.swingapp;
    
    import javax.swing.JPanel;
    import javax.swing.JFrame;
    import javax.swing.JTextField;
    import javax.swing.JButton;
    
    import java.awt.Color;
    import java.awt.GridBagLayout;
    import java.awt.GridBagConstraints;
    import java.awt.Insets;
    import java.awt.Dimension;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    public class Calculator extends JFrame implements ActionListener{
    
        private static final long serialVersionUID = 1L;
    
        private final int INPUT_MODE = 0;
        private final int RESULT_MODE = 1;
        private int displayMode;
        private boolean clearOnNextDigit=true;
        private int lastNumber,result;
        private String lastOperator; // @jve:decl-index=0:
    
        private JPanel jContentPane = null;
    
        private JButton but1 = null;
    
        private JButton but2 = null;
    
        private JButton but3 = null;
    
        private JButton but4 = null;
    
        private JButton but5 = null;
    
        private JButton but6 = null;
    
        private JButton but7 = null;
    
        private JButton but8 = null;
    
        private JButton but9 = null;
    
        private JButton but0 = null;
    
        private JButton butPlus = null;
    
        private JButton butEqual = null;
    
        private JTextField jTextField = null;
    
        private JButton butC = null;
    
        private JButton ButRed = null;
    
        private JButton butBlue = null;
    
        /**
        * This is the default constructor
        */
        public Calculator() {
            super();
            initialize();
        }
    
        /**
        * This method initializes this
        *
        * @return void
        */
        private void initialize() {
            this.setSize(300, 200);
            this.setContentPane(getJContentPane());
            this.setTitle("Calculator");
        }
    
        /**
        * This method initializes jContentPane
        *
        * @return javax.swing.JPanel
        */
        private JPanel getJContentPane() {
            if (jContentPane == null) {
                GridBagConstraints gridBagConstraints17 = new GridBagConstraints();
                gridBagConstraints17.gridx = 4;
                gridBagConstraints17.gridy = 4;
                GridBagConstraints gridBagConstraints16 = new GridBagConstraints();
                gridBagConstraints16.gridx = 4;
                gridBagConstraints16.gridy = 5;
                GridBagConstraints gridBagConstraints14 = new GridBagConstraints();
                gridBagConstraints14.gridx = 1;
                gridBagConstraints14.gridy = 5;
                GridBagConstraints gridBagConstraints13 = new GridBagConstraints();
                gridBagConstraints13.fill = GridBagConstraints.VERTICAL;
                gridBagConstraints13.gridy = 1;
                gridBagConstraints13.weightx = 1.0;
                gridBagConstraints13.insets = new Insets(0, 0, 2, 2);
                gridBagConstraints13.gridx = 4;
                GridBagConstraints gridBagConstraints11 = new GridBagConstraints();
                gridBagConstraints11.gridx = 0;
                gridBagConstraints11.gridy = 4;
                GridBagConstraints gridBagConstraints10 = new GridBagConstraints();
                gridBagConstraints10.gridx = 2;
                gridBagConstraints10.gridy = 4;
                GridBagConstraints gridBagConstraints9 = new GridBagConstraints();
                gridBagConstraints9.gridx = 1;
                gridBagConstraints9.gridy = 4;
                GridBagConstraints gridBagConstraints8 = new GridBagConstraints();
                gridBagConstraints8.gridx = 2;
                gridBagConstraints8.gridy = 3;
                GridBagConstraints gridBagConstraints7 = new GridBagConstraints();
                gridBagConstraints7.gridx = 1;
                gridBagConstraints7.gridy = 3;
                GridBagConstraints gridBagConstraints6 = new GridBagConstraints();
                gridBagConstraints6.gridx = 0;
                gridBagConstraints6.gridy = 3;
                GridBagConstraints gridBagConstraints5 = new GridBagConstraints();
                gridBagConstraints5.gridx = 2;
                gridBagConstraints5.gridy = 1;
                GridBagConstraints gridBagConstraints4 = new GridBagConstraints();
                gridBagConstraints4.gridx = 1;
                gridBagConstraints4.gridy = 1;
                GridBagConstraints gridBagConstraints3 = new GridBagConstraints();
                gridBagConstraints3.gridx = 0;
                gridBagConstraints3.gridy = 1;
                GridBagConstraints gridBagConstraints2 = new GridBagConstraints();
                gridBagConstraints2.gridx = 2;
                gridBagConstraints2.gridy = 0;
                GridBagConstraints gridBagConstraints1 = new GridBagConstraints();
                gridBagConstraints1.gridx = 1;
                gridBagConstraints1.gridy = 0;
                GridBagConstraints gridBagConstraints = new GridBagConstraints();
                gridBagConstraints.gridx = 0;
                gridBagConstraints.gridy = 0;
                jContentPane = new JPanel();
                jContentPane.setLayout(new GridBagLayout());
                jContentPane.add(getBut1(), gridBagConstraints);
                jContentPane.add(getBut2(), gridBagConstraints1);
                jContentPane.add(getBut3(), gridBagConstraints2);
                jContentPane.add(getBut4(), gridBagConstraints3);
                jContentPane.add(getBut5(), gridBagConstraints4);
                jContentPane.add(getBut6(), gridBagConstraints5);
                jContentPane.add(getBut7(), gridBagConstraints6);
                jContentPane.add(getBut8(), gridBagConstraints7);
                jContentPane.add(getBut9(), gridBagConstraints8);
                jContentPane.add(getBut0(), gridBagConstraints9);
                jContentPane.add(getButPlus(), gridBagConstraints10);
                jContentPane.add(getButEqual(), gridBagConstraints11);
                jContentPane.add(getJTextField(), gridBagConstraints13);
                jContentPane.add(getButC(), gridBagConstraints14);
                jContentPane.add(getButRed(), gridBagConstraints16);
                jContentPane.add(getButBlue(), gridBagConstraints17);
                this.ButRed.addActionListener(this);
                this.butBlue.addActionListener(this);
                this.butC.addActionListener(this);
                this.butPlus.addActionListener(this);
                this.butEqual.addActionListener(this);
                this.but0.addActionListener(this);
                this.but1.addActionListener(this);
                this.but2.addActionListener(this);
                this.but3.addActionListener(this);
                this.but4.addActionListener(this);
                this.but5.addActionListener(this);
                this.but6.addActionListener(this);
                this.but7.addActionListener(this);
                this.but8.addActionListener(this);
                this.but9.addActionListener(this);
            }
            return jContentPane;
        }
    
        /**
        * This method initializes but1
        *
        * @return javax.swing.JButton
        */
        private JButton getBut1() {
            if (but1 == null) {
                but1 = new JButton();
                but1.setText("1");
            }
            return but1;
        }
    
        /**
        * This method initializes but2
        *
        * @return javax.swing.JButton
        */
        private JButton getBut2() {
            if (but2 == null) {
                but2 = new JButton();
                but2.setText("2");
            }
            return but2;
        }
    
        /**
        * This method initializes but3
        *
        * @return javax.swing.JButton
        */
        private JButton getBut3() {
            if (but3 == null) {
                but3 = new JButton();
                but3.setText("3");
            }
            return but3;
        }
    
        /**
        * This method initializes but4
        *
        * @return javax.swing.JButton
        */
        private JButton getBut4() {
            if (but4 == null) {
                but4 = new JButton();
                but4.setText("4");
            }
            return but4;
        }
    
        /**
        * This method initializes but5
        *
        * @return javax.swing.JButton
        */
        private JButton getBut5() {
            if (but5 == null) {
                but5 = new JButton();
                but5.setText("5");
            }
            return but5;
        }
    
        /**
        * This method initializes but6
        *
        * @return javax.swing.JButton
        */
        private JButton getBut6() {
            if (but6 == null) {
                but6 = new JButton();
                but6.setText("6");
            }
            return but6;
        }
    
        /**
        * This method initializes but7
        *
        * @return javax.swing.JButton
        */
        private JButton getBut7() {
            if (but7 == null) {
                but7 = new JButton();
                but7.setText("7");
            }
            return but7;
        }
    
        /**
        * This method initializes but8
        *
        * @return javax.swing.JButton
        */
        private JButton getBut8() {
            if (but8 == null) {
                but8 = new JButton();
                but8.setText("8");
            }
            return but8;
        }
    
        /**
        * This method initializes but9
        *
        * @return javax.swing.JButton
        */
        private JButton getBut9() {
            if (but9 == null) {
                but9 = new JButton();
                but9.setText("9");
            }
            return but9;
        }
    
        /**
        * This method initializes but0
        *
        * @return javax.swing.JButton
        */
        private JButton getBut0() {
            if (but0 == null) {
                but0 = new JButton();
                but0.setText("0");
            }
            return but0;
        }
    
        /**
        * This method initializes butPlus
        *
        * @return javax.swing.JButton
        */
        private JButton getButPlus() {
            if (butPlus == null) {
                butPlus = new JButton();
                butPlus.setText("+");
            }
            return butPlus;
        }
    
        /**
        * This method initializes butEqual
        *
        * @return javax.swing.JButton
        */
        private JButton getButEqual() {
            if (butEqual == null) {
                butEqual = new JButton();
                butEqual.setName("");
                butEqual.setText("=");
            }
            return butEqual;
        }
    
        /**
        * This method initializes jTextField
        *
        * @return javax.swing.JTextField
        */
        private JTextField getJTextField() {
            if (jTextField == null) {
                jTextField = new JTextField();
                jTextField.setPreferredSize(new Dimension(80, 20));
            }
            return jTextField;
        }
    
        /**
        * This method initializes butC
        *
        * @return javax.swing.JButton
        */
        private JButton getButC() {
            if (butC == null) {
                butC = new JButton();
                butC.setText("C");
            }
            return butC;
        }
    
        /**
        * This method initializes ButRed
        *
        * @return javax.swing.JButton
        */
        private JButton getButRed() {
            if (ButRed == null) {
                ButRed = new JButton();
                ButRed.setName("");
                ButRed.setPreferredSize(new Dimension(59, 26));
                ButRed.setText("Red");
            }
            return ButRed;
        }
    
        /**
        * This method initializes butBlue
        *
        * @return javax.swing.JButton
        */
        private JButton getButBlue() {
            if (butBlue == null) {
                butBlue = new JButton();
                butBlue.setText("Blue");
            }
            return butBlue;
        }
        /**
        * This method clears the result field
        *
        */
        private void clearAll() {
            setDisplayString("0");
            lastOperator = "0";
            lastNumber = 0;
            displayMode =0;
            result=0;
            clearOnNextDigit = true;
        }
        /**
        *
        * @param String s
        */
        private void setDisplayString(String s){
            this.jTextField.setText(s);
        }
        /**
        *
        * @return text
        */
        private String getDisplayString (){
            return this.jTextField.getText();
        }
        /**
        *
        * @param digit
        */
        private void addDigitToDisplay(int digit){
            if (clearOnNextDigit)
                setDisplayString("");
    
            String inputString = getDisplayString();
            setDisplayString(inputString+ digit);
            displayMode = INPUT_MODE;
            clearOnNextDigit = false;
        }
        /**
        *
        * @return int
        */
        private int getNumberInDisplay() {
            String input = this.jTextField.getText();
            return Integer.parseInt(input);
        }
        /**
        *
        * @return result
        */
        private int equalOperation(){
            result = lastNumber + getNumberInDisplay();
            lastOperator = "0";
            return result;
        }
        /**
        * Performe Action
        */
        public void actionPerformed(ActionEvent ev) {
            // TODO Auto-generated method stub
            String arg= ev.getActionCommand();
            if (arg.equals ("Red"))
                this.jContentPane.setBackground(Color.red);
            else if (arg.equals ("Blue"))
                this.jContentPane.setBackground(Color.blue);
            else if(arg.equals("C"))
                this.clearAll();
            else if(arg.equals("+")){
                lastNumber=getNumberInDisplay();
                clearOnNextDigit = true;
                lastOperator = "+";
            }
            else if(arg.equals("=")){
                displayResult(this.equalOperation());
            }
            else{
                addDigitToDisplay(Integer.parseInt(arg));
            }
    
        }
        /**
        *
        * @param i
        */
        private void displayResult(int i) {
            // TODO Auto-generated method stub
            setDisplayString(Integer.toString(result));
            lastNumber = result;
            clearOnNextDigit = true;
        }
        /**
        * Main Method
        * @param args
        */
    
        public static void main(String[] args){
            Calculator c=new Calculator();
            c.setVisible(true);
        }
    
    
    }

  4. #4
    Bluefox815 is offline Member
    Join Date
    Feb 2008
    Location
    Oregon, USA
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