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My Java GUI calculator keeps returing 0.0 instead of the correct answer to the o

ID: 3829013 • Letter: M

Question

My Java GUI calculator keeps returing 0.0 instead of the correct answer to the operation. Please help, here is my source code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* Sample application using Frame.
*
* @author
* @version
*/


public class WidgetDemoFrame extends JFrame implements ActionListener{

    JTextField jb = new JTextField();
    private double numbers1 = 0;
    private double numbers2 = 0 ;
    private byte function = -1;
   
     public static void main (String [] args)
     {
         WidgetDemoFrame aWidgetDemoFrame = new WidgetDemoFrame();
         aWidgetDemoFrame.setVisible(true);
     }
   
   
   
   
    /**
     * The constructor.
     */
     public WidgetDemoFrame() {
//        this.numbers1 = 0;
//        this.numbers2 = 0;
              
        JMenuBar menuBar = new JMenuBar();
        JMenu menuFile = new JMenu();
        JMenuItem menuFileExit = new JMenuItem();
        Container c = getContentPane();
        c.setBackground(Color.YELLOW);
        JButton b1 = new JButton("1");
        JButton b2 = new JButton("2");
        JButton b3 = new JButton("3");
        JButton b4 = new JButton("4");
        JButton b5 = new JButton("5");
        JButton b6 = new JButton("6");
        JButton b7 = new JButton("7");
        JButton b8 = new JButton("8");
        JButton b9 = new JButton("9");
        JButton b0 = new JButton("0");
        JButton plus = new JButton("+");
        JButton minus = new JButton("-");
        JButton divide = new JButton("/");
        JButton multiply = new JButton("*");
        JButton clear = new JButton("C");
        JButton equals = new JButton("=");
      

      
        setLayout(new GridLayout(5,1));
        JPanel r1 = new JPanel();
        r1.setBackground(Color.RED);
        JPanel r2 = new JPanel();
        r2.setBackground(Color.WHITE);
        JPanel r3 = new JPanel();
        r3.setBackground(Color.BLUE);
        JPanel r4 = new JPanel();
        r4.setBackground(Color.YELLOW);
        JPanel r5 = new JPanel();
        r5.setBackground(Color.CYAN);
        add(r1);
        add(r2);
        add(r3);
        add(r4);
        add(r5);
        r1.setLayout(new GridLayout(1,1));
        r1.add(jb);
        r2.setLayout(new GridLayout(1,4));
        r2.add(b1);
        r2.add(b2);
        r2.add(b3);
        r2.add(plus);
        r3.setLayout(new GridLayout(1,4));
        r3.add(b4);
        r3.add(b5);
        r3.add(b6);
        r3.add(minus);
        r4.setLayout(new GridLayout(1,4));
        r4.add(b7);
        r4.add(b8);
        r4.add(b9);
        r4.add(divide);
        r5.setLayout(new GridLayout(1,4));
        r5.add(clear);
        r5.add(b0);
        r5.add(equals);
        r5.add(multiply);
        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);
        b4.addActionListener(this);
        b5.addActionListener(this);
        b6.addActionListener(this);
        b7.addActionListener(this);
        b8.addActionListener(this);
        b9.addActionListener(this);
        b0.addActionListener(this);
        clear.addActionListener(this);
        equals.addActionListener(this);
        minus.addActionListener(this);
        divide.addActionListener(this);
        multiply.addActionListener(this);
        plus.addActionListener(this);
      
      
        EnterButton enter = new EnterButton();
        equals.addActionListener(enter);

      
        menuFile.setLabel("File");
        menuFileExit.setLabel("Exit");
      
        // Add action listener.for the menu button
        menuFileExit.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    WidgetDemoFrame.this.windowClosed();
                }
              
            }
              
        );
        menuFile.add(menuFileExit);
        menuBar.add(menuFile);
      
        setTitle("WidgetDemo");
        setJMenuBar(menuBar);
        setSize(new Dimension(400, 400));
      
        // Add window listener.
        this.addWindowListener
        (
            new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    WidgetDemoFrame.this.windowClosed();
                }
            }
        );
      
    }
  
     @Override
    public void actionPerformed(ActionEvent e){
       String bs = e.getActionCommand();
       if(bs.equals("1")){
           String x = jb.getText();
           jb.setText(x+"1");
       }
       if(bs.equals("2")){
      
           String x = jb.getText();
           jb.setText(x+"2");
       }
       if(bs.equals("3")){
      
           String x = jb.getText();
           jb.setText(x+"3");
       }
       if(bs.equals("4")){
      
           String x = jb.getText();
           jb.setText(x+"4");
       }
        if(bs.equals("5")){
      
           String x = jb.getText();
           jb.setText(x+"5");
       }
        if(bs.equals("6")){
      
           String x = jb.getText();
           jb.setText(x+"6");
       }
        if(bs.equals("7")){
      
           String x = jb.getText();
           jb.setText(x+"7");
       }
        if(bs.equals("8")){
      
           String x = jb.getText();
           jb.setText(x+"8");
       }
        if(bs.equals("9")){
      
           String x = jb.getText();
           jb.setText(x+"9");
       }
        if(bs.equals("C")){
      
           jb.setText(" ");
       }
        if(bs.equals("-")){
      
           jb.setText(" ");
       }
        if(bs.equals("+")){
      
           jb.setText(" ");
       }
        if(bs.equals("/")){
      
           jb.setText(" ");
       }
        if(bs.equals("*")){
      
           jb.setText(" ");
       }
      
    }     
      
  
    private void windowClosed() {
        System.exit(0);
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
  
  
//divide listener  
private class DivideButton implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        if (numbers1 == 0) {
            numbers1 = Double.parseDouble(jb.getText());
            jb.setText("");
        } else {
            numbers2 = Double.parseDouble(jb.getText());
            jb.setText("");
        }
        function = 0;
    }

}

private class MultiplyButton implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        if (numbers1 == 0) {
            numbers1 = Double.parseDouble(jb.getText());
            jb.setText("");
        } else {
            numbers2 = Double.parseDouble(jb.getText());
            jb.setText("");
        }
        function = 1;
    }

}
private class AddButton implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        if (numbers1 == 0) {
            numbers1 = Double.parseDouble(jb.getText());
            jb.setText(" ");
        } else {
            numbers2 = Double.parseDouble(jb.getText());
            jb.setText(" ");
        }
        function = 2;
    }

}
private class SubtractButton implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        if (numbers1 == 0) {
            numbers1 = Double.parseDouble(jb.getText());
            jb.setText("");
        } else {
            numbers2 = Double.parseDouble(jb.getText());
            jb.setText("");
        }
        function = 3;
    }
}
private class EnterButton implements ActionListener {
        @Override
    public void actionPerformed(ActionEvent e) {
        numbers2 = Double.parseDouble(jb.getText());

        if (function == 0) {
            jb.setText(Double.toString((Math.round((numbers1 / numbers2) * 100)) / 100));
        } else if (function == 1) {
            jb.setText(Double.toString(numbers1 * numbers2));
        } else if (function == 2) {
            jb.setText(Double.toString(numbers2 + numbers1));
        } else if (function == 3) {
            jb.setText(Double.toString(numbers1 - numbers2));
        } else {
            jb.setText(String.valueOf(numbers1));
        }
            numbers1 = Double.parseDouble(jb.getText());
    }
  
}
    }

Explanation / Answer

//There was small mistake

//you was not adding corresponding lisner classes to + ,- ,/ and * button


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* Sample application using Frame.
*
* @author
* @version
*/


public class WidgetDemoFrame extends JFrame implements ActionListener{
JTextField jb = new JTextField();
private double numbers1 = 0;
private double numbers2 = 0 ;
private byte function = -1;

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




/**
* The constructor.
*/
public WidgetDemoFrame() {
// this.numbers1 = 0;
// this.numbers2 = 0;
  
JMenuBar menuBar = new JMenuBar();
JMenu menuFile = new JMenu();
JMenuItem menuFileExit = new JMenuItem();
Container c = getContentPane();
c.setBackground(Color.YELLOW);
JButton b1 = new JButton("1");
JButton b2 = new JButton("2");
JButton b3 = new JButton("3");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("7");
JButton b8 = new JButton("8");
JButton b9 = new JButton("9");
JButton b0 = new JButton("0");
JButton plus = new JButton("+");
JButton minus = new JButton("-");
JButton divide = new JButton("/");
JButton multiply = new JButton("*");
JButton clear = new JButton("C");
JButton equals = new JButton("=");
  
  
setLayout(new GridLayout(5,1));
JPanel r1 = new JPanel();
r1.setBackground(Color.RED);
JPanel r2 = new JPanel();
r2.setBackground(Color.WHITE);
JPanel r3 = new JPanel();
r3.setBackground(Color.BLUE);
JPanel r4 = new JPanel();
r4.setBackground(Color.YELLOW);
JPanel r5 = new JPanel();
r5.setBackground(Color.CYAN);
add(r1);
add(r2);
add(r3);
add(r4);
add(r5);
r1.setLayout(new GridLayout(1,1));
r1.add(jb);
r2.setLayout(new GridLayout(1,4));
r2.add(b1);
r2.add(b2);
r2.add(b3);
r2.add(plus);
r3.setLayout(new GridLayout(1,4));
r3.add(b4);
r3.add(b5);
r3.add(b6);
r3.add(minus);
r4.setLayout(new GridLayout(1,4));
r4.add(b7);
r4.add(b8);
r4.add(b9);
r4.add(divide);
r5.setLayout(new GridLayout(1,4));
r5.add(clear);
r5.add(b0);
r5.add(equals);
r5.add(multiply);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
b0.addActionListener(this);
clear.addActionListener(this);
equals.addActionListener(this);
minus.addActionListener(new SubtractButton());
divide.addActionListener(new DivideButton());
multiply.addActionListener(new MultiplyButton());
plus.addActionListener(new AddButton());
  
  
EnterButton enter = new EnterButton();
equals.addActionListener(enter);
  
menuFile.setLabel("File");
menuFileExit.setLabel("Exit");
  
// Add action listener.for the menu button
menuFileExit.addActionListener
(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
WidgetDemoFrame.this.windowClosed();
}
  
}
  
);
menuFile.add(menuFileExit);
menuBar.add(menuFile);
  
setTitle("WidgetDemo");
setJMenuBar(menuBar);
setSize(new Dimension(400, 400));
  
// Add window listener.
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
WidgetDemoFrame.this.windowClosed();
}
}
);
  
}
  
@Override
public void actionPerformed(ActionEvent e){
String bs = e.getActionCommand();
if(bs.equals("1")){
String x = jb.getText();
jb.setText(x+"1");
}
if(bs.equals("2")){
  
String x = jb.getText();
jb.setText(x+"2");
}
if(bs.equals("3")){
  
String x = jb.getText();
jb.setText(x+"3");
}
if(bs.equals("4")){
  
String x = jb.getText();
jb.setText(x+"4");
}
if(bs.equals("5")){
  
String x = jb.getText();
jb.setText(x+"5");
}
if(bs.equals("6")){
  
String x = jb.getText();
jb.setText(x+"6");
}
if(bs.equals("7")){
  
String x = jb.getText();
jb.setText(x+"7");
}
if(bs.equals("8")){
  
String x = jb.getText();
jb.setText(x+"8");
}
if(bs.equals("9")){
  
String x = jb.getText();
jb.setText(x+"9");
}
if(bs.equals("C")){
  
jb.setText(" ");
}
if(bs.equals("-")){
  
jb.setText(" ");
}
if(bs.equals("+")){
  
jb.setText(" ");
}
if(bs.equals("/")){
  
jb.setText(" ");
}
if(bs.equals("*")){
  
jb.setText(" ");
}
  
}   
  
  
private void windowClosed() {
System.exit(0);
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
  
  
//divide listener
private class DivideButton implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
if (numbers1 == 0) {
numbers1 = Double.parseDouble(jb.getText());
jb.setText("");
} else {
numbers2 = Double.parseDouble(jb.getText());
jb.setText("");
}
function = 0;
}
}
private class MultiplyButton implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
if (numbers1 == 0) {
numbers1 = Double.parseDouble(jb.getText());
jb.setText("");
} else {
numbers2 = Double.parseDouble(jb.getText());
jb.setText("");
}
function = 1;
}
}
private class AddButton implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("numbers1 "+numbers1);
numbers1 = Double.parseDouble(jb.getText());
jb.setText("");
function = 2;
}
}
private class SubtractButton implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
if (numbers1 == 0) {
numbers1 = Double.parseDouble(jb.getText());
jb.setText("");
} else {
numbers2 = Double.parseDouble(jb.getText());
jb.setText("");
}
// numbers1 = Double.parseDouble(jb.getText());
function = 3;
}
}
private class EnterButton implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
numbers2 = Double.parseDouble(jb.getText());
System.out.println("number2 "+numbers2+" number1 "+numbers1);
if (function == 0) {
jb.setText(Double.toString((Math.round((numbers1 / numbers2) * 100)) / 100));
} else if (function == 1) {
jb.setText(Double.toString(numbers1 * numbers2));
} else if (function == 2) {
jb.setText(Double.toString(numbers2 + numbers1));
} else if (function == 3) {
jb.setText(Double.toString(numbers1 - numbers2));
} else {
jb.setText(String.valueOf(numbers1));
}
numbers1 = Double.parseDouble(jb.getText());
}
  
}
}

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