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Thread: programmimng problem or bug?

  1. #1
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    Default programmimng problem or bug?

    NetBeans 8.0.1
    This is the 3rd time I've rebuilt this program.
    My problem seems to be when I add the Menu's.
    When I use RUN, the menu's sometimes show up or sometimes NOT.
    When I use DEBUG it works every time.
    This is the smallest I can get the program before the problem
    starts.
    When I add the menu's it fails?



     
     
    package myclockpaneltest;
     
    import java.awt.Color;
    import java.awt.Dimension;
    import java.awt.Font;
    import javax.swing.*;
     
    public class MyclockPanelTest {
     
        public JFrame f = new JFrame();
        public JPanel main = new JPanel();
        public JPanel p1 = new JPanel();
        public JPanel p2 = new JPanel();
        public JMenuBar jmb = new JMenuBar();
        public JMenu jm0, jm1;
        public JMenuItem mi0, mi1;
     
     
        public MyclockPanelTest(){
            f.setVisible(true);
            f.setSize(357,165);
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
        main.setBackground(Color.BLUE);
        f.add(main);
        main.add(p1);
        main.add(p2);
        p1.setPreferredSize(new Dimension(70,90));
        p1.setBackground(Color.ORANGE);
        p2.setPreferredSize(new Dimension(260,90));
        p2.setBackground(Color.BLACK);
     
        f.setJMenuBar(jmb);
        jm0 = new JMenu("Close");
              mi0 = new JMenuItem("Exit");
              jm0.add(mi0);
        jm1 = new JMenu("Time");
              mi1 = new JMenuItem("24-Hour clock");   
              jm1.add(mi1);
          jmb.add(jm0);
          jmb.add(jm1);     
        }
     
     
     
        public static void main(String[] args) {
            // TODO code application logic here
        new MyclockPanelTest();
        }
    }


  2. #2
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    Default Re: programmimng problem or bug?

    Post the code that adds the menus and causes the failure.

    Swing applications should be run on the EDT.

    Use better variable names.

    Build the UI, pack() it, and then make it visible.

  3. #3
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    Default Re: programmimng problem or bug?

    Quote Originally Posted by GregBrannon View Post
    Post the code that adds the menus and causes the failure.

    Swing applications should be run on the EDT.

    Use better variable names.

    Build the UI, pack() it, and then make it visible.
    The entire code is posted.
    the menus are below setJMenubar

    The code I posted is completely runnable.

    I don't understand Swing applications should be run on the EDT.

  4. #4
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    Default Re: programmimng problem or bug?

    I misunderstood, "This is the smallest I can get the program before the problem starts."

    "Build the UI, pack() it, and then make it visible," means to move the following statement to the last line in the constructor:

    f.setVisible(true);

  5. The Following User Says Thank You to GregBrannon For This Useful Post:

    JoeB (October 8th, 2014)

  6. #5
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    Default Re: programmimng problem or bug?

    Quote Originally Posted by GregBrannon View Post
    I misunderstood, "This is the smallest I can get the program before the problem starts."

    "Build the UI, pack() it, and then make it visible," means to move the following statement to the last line in the constructor:

    f.setVisible(true);
    Thanks, it works.
    I viewed some my programs done with the IDE.
    It all makes sense.
    I'm not a student of Java, it's just a hobby. It first 10 tutorials are my reference.

    JoeB

  7. #6
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    Default Re: programmimng problem or bug?

    You should still google for the EDT or EventDispatchThread.
    All Swing applications must be started on the EDT (and NOT your main thread) and every update to any Swing component must also happen on the EDT or Swing might not work.

  8. The Following User Says Thank You to Cornix For This Useful Post:

    JoeB (October 9th, 2014)

  9. #7
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    Default Re: programmimng problem or bug?

    Quote Originally Posted by Cornix View Post
    You should still google for the EDT or EventDispatchThread.
    All Swing applications must be started on the EDT (and NOT your main thread) and every update to any Swing component must also happen on the EDT or Swing might not work.
    Thanks, Now I know where invokeLater comes from in my IDE in my IDE programs.
    This gives me something new to learn.

    Joe

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