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Recognizing when a button is pressed.

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Join Date: Jul 2005

Posts: 5

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MFal

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Recognizing when a button is pressed.

Aug 1st, 2005

I really appreciate all the help i've been getting on my project lately from you guys, and hopefully this will be the last problem.

I've written an applet, and it uses ActionListener to detect when the button is pressed. The program is supposed to go through my methods when the button is pressed. However when i launch the applet and put values in the boxes, nothing happens when i click. Using an embedded class is too hard for me (i've been doing java for 5 weeks, and the only prior experience i had was html). Also i can't seem to make two seperate files, because only one can implement ActionListener.

here's what i have so far.

making the button -

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
enter = new JButton("Click here to calculate numeric palindrome.");
    enter.addActionListener(this);
enter = new JButton("Click here to calculate numeric palindrome.");
    enter.addActionListener(this);

running my methods when i click the button -

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
 public void actionPerformed(ActionEvent e)
  {
    Numtemp = displayN.getText();
 
    Base = displayB.getText();
 
	convert();
	FindPalindrome();
	reconvert();
	print();
  }
 public void actionPerformed(ActionEvent e)
  {
    Numtemp = displayN.getText();

    Base = displayB.getText();

	convert();
	FindPalindrome();
	reconvert();
	print();
  }

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Join Date: Jun 2004

Posts: 609

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freesoft_2000 freesoft_2000 is offline

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Re: Recognizing when a button is pressed.

Aug 1st, 2005

Hi everyone,

I have no idea the number of JButtons in your application but where's the source??

Try this

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
public void actionPerformed(ActionEvent e)
  {
 
JButton B = (JButton)e.getSource();
 
if(B == enter)
    Numtemp = displayN.getText();
 
    Base = displayB.getText();
 
	convert();
	FindPalindrome();
	reconvert();
	print();
}
 
  }
public void actionPerformed(ActionEvent e)
  {

JButton B = (JButton)e.getSource();

if(B == enter)
    Numtemp = displayN.getText();

    Base = displayB.getText();

	convert();
	FindPalindrome();
	reconvert();
	print();
}

  }

I hope this helps you

Yours Sincerely

Richard West

Microsoft uses "One World, One Web, One Program" as a slogan.
Doesn’t that sound like "Ein Volk, Ein Reich, Ein Führer" to you, too?
— Eric S. Raymond

Tell me what type of software do you like and what would you pay for it

http://www.daniweb.com/techtalkforums/thread19660.html

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Join Date: Jul 2005

Posts: 5

Reputation: MFal is an unknown quantity at this point

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MFal

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Newbie Poster

Re: Recognizing when a button is pressed.

Aug 1st, 2005

Thanks for responding. I took that code and adapted it to my code, and it compiles, but i still have the same problem. Here is all of the relevant code. Oh and there is only one button.

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
public void init()
  {
    displayN = new JTextField(35);
    displayN.setFont(new Font("Monospaced", Font.BOLD, 14));
    String message1 = "Enter Number Here";
    displayN.setText(message1);
 
    displayB = new JTextField(15);
    displayB.setFont(new Font("Monospaced", Font.BOLD, 14));
    String message2 = "Enter Base Here";
    displayB.setText(message2);
 
    enter = new JButton("Click here to calculate numeric palindrome.");
    enter.addActionListener(this);
 
    displayS = new JTextField(60);
    displayS.setFont(new Font("Monospaced", Font.BOLD, 14));
 
    Container c = getContentPane();
    c.setLayout(new FlowLayout());
    c.setBackground(Color.darkGray);
    c.add(displayN);
    c.add(displayB);
    c.add(enter);
    c.add(displayS);
 
  }
 
//This tells the program to run when the button is clicked. Help for this code came from
//freesoft_2000 at the www.daniweb.com/techtalkforums
  public void actionPerformed(ActionEvent e)
  {
    JButton B = (JButton)e.getSource();
 
    if(B == enter)
    {
    Numtemp = displayN.getText();
 
    Base = displayB.getText();
 
	convert();
	FindPalindrome();
	reconvert();
	print();
	}
  }
public void init()
  {
    displayN = new JTextField(35);
    displayN.setFont(new Font("Monospaced", Font.BOLD, 14));
    String message1 = "Enter Number Here";
    displayN.setText(message1);

    displayB = new JTextField(15);
    displayB.setFont(new Font("Monospaced", Font.BOLD, 14));
    String message2 = "Enter Base Here";
    displayB.setText(message2);

    enter = new JButton("Click here to calculate numeric palindrome.");
    enter.addActionListener(this);

    displayS = new JTextField(60);
    displayS.setFont(new Font("Monospaced", Font.BOLD, 14));

    Container c = getContentPane();
    c.setLayout(new FlowLayout());
    c.setBackground(Color.darkGray);
    c.add(displayN);
    c.add(displayB);
    c.add(enter);
    c.add(displayS);

  }

//This tells the program to run when the button is clicked. Help for this code came from
//freesoft_2000 at the www.daniweb.com/techtalkforums
  public void actionPerformed(ActionEvent e)
  {
    JButton B = (JButton)e.getSource();

    if(B == enter)
    {
    Numtemp = displayN.getText();

    Base = displayB.getText();

	convert();
	FindPalindrome();
	reconvert();
	print();
	}
  }

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Join Date: Jun 2004

Posts: 2,108

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server_crash server_crash is offline

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Re: Recognizing when a button is pressed.

Aug 1st, 2005

Debugging 101: Put some system.out.println()'s throughout the actionPerformed() method, and all methods it calls. check to make sure all variables have the proper values, and that it even enters certain methods.

By the way, what are you doing with these lines:

Numtemp = displayN.getText();

Base = displayB.getText();

If those are used in the coorisponding methods called, I would suggest passing them as parameters instead.