Java

28-Apr-20 21:43

In addition to Peter's suggestion, we have already explained that if you want help then you need to show some effort on your part. You would also do well to make up your mind which language you want to work in. Switching between VB.NET and Java every few days is just a waste of your time, as you will be unlikely to get anywhere. Focus on one and go and study the language carefully. I have already given you the link (below) for the Java Tutorials, and you can find plenty of resources for VB.NET here on CodeProject and on MSDN.

Re: VB.NET

ZurdoDev8-May-20 1:30

ZurdoDev

8-May-20 1:30

Very easy. In the button click event take the value of the label and add one to it and then write it back to the label.

Social Media - A platform that makes it easier for the crazies to find each other.

Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.

Java

Babayomi26-Apr-20 4:41

26-Apr-20 4:41

Pls i need some help on java programming

Richard MacCutchan26-Apr-20 5:31

26-Apr-20 5:31

You will find excellent guides at: The Java™ Tutorials[^]

Babayomi26-Apr-20 12:04

26-Apr-20 12:04

Thanks very much sir... Pls can u help me on VB6

Dave Kreskowiak26-Apr-20 12:10

Dave Kreskowiak

26-Apr-20 12:10

There are no tutorials any more for VB6. That's been long dead.

Pickup the free Community edition of Visual Studio and you can find all kinds of resources on VB.NET.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Babayomi26-Apr-20 18:59

26-Apr-20 18:59

Sir, can u help me on VB.NET I dont know anything about it and please sir am not with system to be use to run the code can u be helping me to run it and be showing me the output?.
sorry for the question sir

Dave Kreskowiak27-Apr-20 3:56

Dave Kreskowiak

27-Apr-20 3:56

No, I can't.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Richard MacCutchan26-Apr-20 21:39

26-Apr-20 21:39

What do you mean?

Babayomi27-Apr-20 1:03

27-Apr-20 1:03

Maybe you can be helping me to run my code and be showing me the output because am not with system right now
And please help me on VB.NET

Richard MacCutchan27-Apr-20 1:32

27-Apr-20 1:32

Sorry, we are not here to do other people's work for them. I have given you some links in your QA post which will allow you to build and test your code online; give them a try.

Babayomi27-Apr-20 11:30

27-Apr-20 11:30

Thanks sir

Android Studio submission

ZurdoDev27-Apr-20 1:23

ZurdoDev

27-Apr-20 1:23

Stop Spamming!

Social Media - A platform that makes it easier for the crazies to find each other.

Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.

Gammill18-Apr-20 10:34

Gammill

18-Apr-20 10:34

I have some Java code I would like to share.  I have an example app via Android Studio so that one can see the graphics.  How best to share it?  The APK?  A tar.gz of my project folder?  Or zip (Linux based zip app)?

I plan on a tar.gz or zip of the set of classes; but not sure about how
best to share the Android Studio project.

WedgeSoft

Re: Android Studio submission

Gammill18-Apr-20 13:52

Gammill

18-Apr-20 13:52

I think I have the answer to my own question: under File I see (for the first time) "Export to zip file". I tested that and it seems to be the ticket. So... sorry I bothered folks and unless you have a better answer... consider this question closed.

WedgeSoft

Introduction to object oriented programming

Member 1479832810-Apr-20 6:59

Member 14798328

10-Apr-20 6:59

Hi I need it assistant, I'm struggling with some question and it due date is tomorrow

Re: Introduction to object oriented programming

Richard MacCutchan10-Apr-20 21:17

10-Apr-20 21:17

There are thousands of helpful tutorials online. But you have probably left it too late to make use of any of them.

cannot resolve

MallardsReach30-Mar-20 3:32

MallardsReach

30-Mar-20 3:32

Below is the full code I am using but I get the following error messages showing at the start of my code

Quote:
Multiple markers at this line
- txtNumOne cannot be resolved
- txtNumTwo cannot be resolved

and

Quote:
lblDPAnswer cannot be resolved

Java

package components;
import java.awt.event.*;
import javax.swing.*;
import java.awt.Color;
import java.awt.Font;
import javax.swing.BorderFactory; 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class MathsLesson
{	 	 
      String strAnswer;
       
    	void showAnswer(int dPlaces){
    Double numAnswer; String strAnswer; 
    numAnswer = (Double.parseDouble(txtNumOne.getText()))* (Double.parseDouble(txtNumTwo.getText()));
    strAnswer = String.format("%,." + dPlaces + "f", numAnswer); 
    lblDPAnswer.setText(strAnswer);
   
 }
	
	public MathsLesson() 
	{		
		JFrame frame = new JFrame("Tables"); // Creating instance of JFrame
        frame.setSize(800, 600); // Setting the width and height of frame
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       	JPanel panel = new JPanel(); //Creating panel. Inside panels we can add textfields, buttons and other components.
		panel.setBorder(javax.swing.BorderFactory.createEtchedBorder(javax.swing.border.EtchedBorder.RAISED, new java.awt.Color(255, 51, 51), new java.awt.Color(153, 0, 51)));
		frame.add(panel); // Add panel to frame
       	frame.setVisible(true); // Setting the frame visibility to true
			panel.setLayout(null);	
		    JPanel tablepanel = new JPanel();
			tablepanel.setLayout(null);
			tablepanel.setBounds(10,20,320,300);
			tablepanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(), "Times Tables"));
			tablepanel.setOpaque(false); 
			panel.add(tablepanel);
			
			panel.setLayout(null);	
		    JPanel decimalpanel = new JPanel();
			decimalpanel.setLayout(null);
			decimalpanel.setBounds(10,320,320,100);
			decimalpanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(), "Decimal Places"));
			decimalpanel.setOpaque(false); 
			panel.add(decimalpanel);
			
			JTextArea displayTable = new JTextArea();
			displayTable.setEditable(false);
			displayTable.setFont(new java.awt.Font("Times New Roman", 0, 18));
			displayTable.setText("Choose a button on the right to view the table you want to see");
			displayTable.setLineWrap(true);
			displayTable.setWrapStyleWord(true);
			displayTable.setBounds(10,20,150,260); 
			displayTable.setBorder(BorderFactory.createLineBorder(Color.GREEN));
			tablepanel.add(displayTable);
			
			//ImageIcon imageIcon = new ImageIcon("images/bird.gif");
			JLabel userLabel = new JLabel();  // Creating JLabel
			userLabel.setIcon(new ImageIcon("images/bird.gif"));
			userLabel.setHorizontalAlignment(SwingConstants.CENTER);
			userLabel.setFont(new Font("Verdana", Font.ITALIC, 16)); //set font
			userLabel.setBounds(500,20,125,125); 
			userLabel.setBorder(BorderFactory.createLineBorder(Color.BLUE));	
			panel.add(userLabel); // Add Label to panel
			
			JTextField txtNumOne = new JTextField(20);
			txtNumOne.setBounds(15,350,70,25);
			panel.add(txtNumOne); // Add TextField to panel
			
			JTextField txtNumTwo = new JTextField(20);
			txtNumTwo.setBounds(130,350,70,25);
			panel.add(txtNumTwo); // Add TextField to panel
			
			JLabel lblDPAnswer = new JLabel();  // Creating JLabel
			lblDPAnswer.setHorizontalAlignment(SwingConstants.CENTER);
			lblDPAnswer.setBounds(220,350,100,25); 
	        lblDPAnswer.setBackground(new java.awt.Color(255, 255, 255));
	        lblDPAnswer.setFont(new java.awt.Font("Times New Roman", 1, 18)); // NOI18N
	        lblDPAnswer.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
	        lblDPAnswer.setOpaque(true);
			panel.add(lblDPAnswer); // Add Label to panel
			
			ButtonGroup bgDecimalButtons = new ButtonGroup();
			JRadioButton rbOneDecimal = new JRadioButton("1 DP");
			bgDecimalButtons.add(rbOneDecimal);
			rbOneDecimal.setFont(new java.awt.Font("Times New Roman", 0, 14));
			rbOneDecimal.setBounds(15, 380, 60, 30);
			panel.add(rbOneDecimal);
			
			JRadioButton rbTwoDecimal = new JRadioButton("2 DP");
			bgDecimalButtons.add(rbTwoDecimal);
			rbTwoDecimal.setFont(new java.awt.Font("Times New Roman", 0, 14));
			rbTwoDecimal.setBounds(85, 380, 60, 30);
			panel.add(rbTwoDecimal);
			
			JRadioButton rbThreeDecimal = new JRadioButton("3 DP");
			bgDecimalButtons.add(rbThreeDecimal);
			rbThreeDecimal.setFont(new java.awt.Font("Times New Roman", 0, 14));
			rbThreeDecimal.setBounds(155, 380, 60, 30);
			panel.add(rbThreeDecimal);
			
			JButton btnSum = new JButton("Enter"); // Create button
			btnSum.setBounds(220, 380, 100, 25);
	        btnSum.setFont(new java.awt.Font("Times New Roman", 1, 36));
	        btnSum.setText("=");
	        btnSum.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED));
			panel.add(btnSum); // Add btnSum to panel
		
			
			JRadioButton[] rbTable = new JRadioButton[13]; //set an array for 12 radioButtons			
			ItemListener itemListener = new ItemListener() {
				public void itemStateChanged(ItemEvent itemEvent) {
					AbstractButton aButton = (AbstractButton)itemEvent.getSource();
						int state = itemEvent.getStateChange();
						String name = aButton.getText();
					for (int i = 1; i < rbTable.length; i++)
					{	
						if (state == ItemEvent.SELECTED) {
							if (name.equals(rbTable[i].getText())) {
								displayTable.setText(""); //Clear the displayTable
								tablepanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),+ i + " Times Table"));								
								int firstNum, answerNum;
								for (firstNum = 1; firstNum <=12; firstNum ++)
								{
									answerNum = firstNum * i;
									displayTable.append("  " + firstNum + " x " + i + " = " + answerNum +"\n");
								}
				
							}
						}
					}
				}  
			};
			
			    ButtonGroup bgTableButtons = new ButtonGroup();
				int y = 50, x = 165; //Add 12 tables radio buttons
				for (int i = 1; i < rbTable.length; i++)
					{
						rbTable[i] = new JRadioButton("X  " + Integer.toString(i));
						rbTable[i].setFont(new java.awt.Font("Times New Roman", 0, 18));
						rbTable[i].addItemListener(itemListener);
						rbTable[i].setBounds(x, y, 70, 20);
						if(i == 6){
						x = 235;
						y = 20;
						}
						bgTableButtons.add(rbTable[i]);
						tablepanel.add(rbTable[i]);
						y = y + 30;
					}
				
			      rbOneDecimal.addActionListener(new ActionListener() {
				         public void actionPerformed(ActionEvent e) {
				        	 lblDPAnswer.setText("Button 1");
				      				        	}
				      });
			      rbTwoDecimal.addActionListener(new ActionListener() {
				         public void actionPerformed(ActionEvent e) {
				        	 lblDPAnswer.setText("Button 2"); 
				         }
				      });
			      
			      rbThreeDecimal.addActionListener(new ActionListener() {
				         public void actionPerformed(ActionEvent e) {   
				        	 lblDPAnswer.setText("Button 3");
				         }
				      });
			      btnSum.addActionListener(new ActionListener() {
				         public void actionPerformed(ActionEvent e) {
				        	  showAnswer(0); //call method
				        	 }
				      });
	}//End of Constructor
		
	public static void main(String[] args) 
	{
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MathsLesson();	
                
            }
        });
     } //End of void main
            
} // End of Class

Richard MacCutchan30-Mar-20 3:50

30-Mar-20 3:50

You are creating local variables in one method, and then trying to access them from other methods. You need to understand the scope rules, i.e whether variables are local or not. So txtNumOne and txtNumTwo should be class level variables. Alternatively they could be passed as parameters to the showAnswer method.

You have a potential mistake in the following code:

Java

     String strAnswer; // this is a class level variable, i.e. visible to every method in the class

   void showAnswer(int dPlaces){
       Double numAnswer;
       // this has the same name as the class level variable,
       // but is only visible inside this method, so a possible conflict
       String strAnswer;
       // don't write compound statements like this, they are much harder to diagnose when things go wrong
       numAnswer = (Double.parseDouble(txtNumOne.getText()))* (Double.parseDouble(txtNumTwo.getText()));
       strAnswer = String.format("%,." + dPlaces + "f", numAnswer);
       lblDPAnswer.setText(strAnswer);

}

MallardsReach30-Mar-20 6:29

MallardsReach

30-Mar-20 6:29

Thanks Richard after many hours of head scratching and internet searching I think I have it.
Below is the class level variables and the method showAnswer.

Java

 // Variables declaration
        double decNum1, decNum2, decAnswer; // class level available to all
        String strAnswer;
   // End of variables declaration

 void showAnswer(int dPlaces){
     Double numAnswer;
     numAnswer = decNum1 * decNum2;
     strAnswer = String.format("%,." + dPlaces + "f", numAnswer);
}

And below is the 3 radiobuttons and the sum button that call the method when clicked.

Java

rbOneDecimal.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
           decNum1 = Double.parseDouble(txtNumOne.getText());
           decNum2 = Double.parseDouble(txtNumTwo.getText());
            showAnswer(1); //call method
            lblDPAnswer.setText(strAnswer);
                              }
    });
rbTwoDecimal.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
           decNum1 = Double.parseDouble(txtNumOne.getText());
           decNum2 = Double.parseDouble(txtNumTwo.getText());
            showAnswer(2); //call method
            lblDPAnswer.setText(strAnswer);
       }
    });

rbThreeDecimal.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
           decNum1 = Double.parseDouble(txtNumOne.getText());
           decNum2 = Double.parseDouble(txtNumTwo.getText());
            showAnswer(3); //call method
            lblDPAnswer.setText(strAnswer);
       }
    });
btnSum.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
           decNum1 = Double.parseDouble(txtNumOne.getText());
           decNum2 = Double.parseDouble(txtNumTwo.getText());
            showAnswer(0); //call method
            lblDPAnswer.setText(strAnswer);
           }
    });

Could it be done a better way? I seem to be repeating these 2 lines.

Java

decNum1 = Double.parseDouble(txtNumOne.getText());
decNum2 = Double.parseDouble(txtNumTwo.getText());

Richard MacCutchan30-Mar-20 6:45

30-Mar-20 6:45

Rather than make these variables at class level, make them parameters to showAnswer (actually calcAnswer would be a better name) method. And the final result shoud be the return value. Something like:

Java

String showAnswer(double decNum1, double decNum2, int dPlaces){
     Double numAnswer = decNum1 * decNum2;
     String strAnswer = String.format("%,." + dPlaces + "f", numAnswer);

    return strAnswer;
}

That keeps everything neatly within the method.

You can reduce all the duplication by using the same handler for all the buttons.

Java

public void actionPerformed(ActionEvent e) {
    int numDecimals = // get the number from the button text

    double decNum1 = Double.parseDouble(txtNumOne.getText());
    double decNum2 = Double.parseDouble(txtNumTwo.getText());
    String strResult = showAnswer(decNum1, decNum2, numDecimals); //call method
    lblDPAnswer.setText(strResult);
}

Then add that to each button:

Java

rbOneDecimal.addActionListener(actionPerformed);
rbTwoDecimal.addActionListener(actionPerformed);

You may need to check the syntax requirements for these last two/three items

MallardsReach30-Mar-20 10:32

MallardsReach

30-Mar-20 10:32

Thought it wouldn't work as easy as that. Frown | :(

errors for the actionPerformed method,

Quote:
Multiple markers at this line
- void is an invalid type for the variable actionPerformed
- Syntax error on token "(", ; expected
- Syntax error on token ")", ; expected

errors for all the buttons .addActionListener(ActionPerformed);

Quote:
ActionPerformed cannot be resolved to a variable

Richard MacCutchan30-Mar-20 21:34

30-Mar-20 21:34

I hesitate to say this yet again, but please go to The Java™ Tutorials[^] and study the language properly. You are not going to learn it piecemeal by posting questions here, as each issue is looked at in isolation. You need to follow a structured learning path to get a full understanding of, not just the language, but its framework support as well.

Richard MacCutchan30-Mar-20 22:52