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Thread: Set Invisible or close a frame

  1. #1
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    Default Set Invisible or close a frame

    Hello!
    I want to make a program which
    1) will open a frame with a button.
    2) When I press the button it will open a new frame with another button.
    3)When I press the button of the second frame I want to close the second frame.

    PHP Code:
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;

    import javax.swing.JButton;
    import javax.swing.JFrame;

    public class 
    Listener
        
    implements ActionListener
    {
        @
    Override
        
    public void actionPerformed(ActionEvent e)
        {
            
    JFrame newFrame = new JFrame("New Frame");
            
    String str e.getActionCommand();
            
    JButton button = new JButton("DEL");
            
    button.addActionListener(this);
            
    newFrame.add(button);
            
    newFrame.setSize(200,200);
            if(
    str == "OK")
            {
                
    newFrame.setVisible(true);
            }
            if(
    str.equals(button))
            {
                
    newFrame.setVisible(false);
            }
        }
        public static 
    void main(String[] args
        {
            
    Listener listen = new Listener();
            
    JFrame frame = new JFrame();
            
    JButton button = new JButton("OK");
            
    button.addActionListener(listen);
            
    frame.add(button);
            
    frame.setSize(50,150);
            
    frame.setVisible(true);
        }

    Have done this which
    1) will open a frame with a button.
    2) When I press the button it will open a new frame with another button.

    As you see i have tried the setVisible(false) but it don't work so here is my question. What I could use to close or set invisible the frame ? and why the setVisible(false) don't work?

    Thanks in advance for your time wasting,
    Kostas
    Last edited by Souperk; November 29th, 2011 at 02:06 PM.


  2. #2
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    Default Re: Set Invisible or close a frame

    but it don't work
    Please explain what happens/

     if(str == "OK")
    You should use the equals() method to compare the contents of Strings, not the == operator.

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    Default Re: Set Invisible or close a frame

    First of all, sorry for not specifying my question.

    Now my question: How can i set invisible a frame when a press a button.

    I hope this will help you to help me.

    Thanks in advance,
    Kostas

  4. #4
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    Default Re: Set Invisible or close a frame

    What happens when you call setVisible(false) for a visible window?

    Change your posted code to call setVisible(false) for the currently visible window. Don't do anything else, just call that method and see what happens.

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    Default Re: Set Invisible or close a frame

    if you mean this
    PHP Code:
            JFrame frame = new JFrame();
            
    frame.setVisible(true);
            
    frame.setVisible(false); 

    i tried that

    PHP Code:
            if(str.equals(button))
            {
                
    newFrame.setVisible(false);
                
    System.out.println("OK");
            } 
    But there wasn't output in the console(in eclipse)

    then i tried with the == operator and i had as output OK
    but the == operator and the method equals() aren't the same?

    Also when i debugged i found that it use the println but it don't use the setVisible(false) or i think it stuck

    I think the problem is in the if statement but i can't look at it anymore I will sleep (Step 0) and i will spent the whole day tomorrow thinking it. If you find why it don't work please let me know.

    Thank you in advance

    I think the most i have written would be very difficult to understand but i am Greek and i don't know enough English to specify it more

  6. #6
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    Default Re: Set Invisible or close a frame

    No, that is not I meant. I meant to change the listener to something like this so when the button was pressed, setVisible(false) would execute and the window with the button would disappear.
        public void actionPerformed(ActionEvent e)
        {
            jf.setVisible(false);              // This Hides the window
        }
    You must pass a reference to the window to the listener's class and save it in a variable: jf.

  7. The Following User Says Thank You to Norm For This Useful Post:

    Souperk (November 30th, 2011)

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    Default Re: Set Invisible or close a frame

    Thank you I made it work with 2 new Action Listener.

  9. #8
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    Default Re: Set Invisible or close a frame

    I'm sure there are several ways you could do it. More ActionListeners sounds more complicated than the way I did it.

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    Default Re: Set Invisible or close a frame

    I used the following code

    PHP Code:
            JButton b = new JButton();
            
    b.addActionListener(new ActionListener() {
                
                @
    Override
                
    public void actionPerformed(ActionEvent arg0
                {
                    
    frame.setVisible(false);
                }
            }); 
    for to close it and then setVisible(true) to show it. It found it more simple than using a whole class for a simple work of 2 lines

  11. #10
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    Default Re: Set Invisible or close a frame

    Your last post: with 2 new Action Listener
    was confusing.

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