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Thread: Problem In JFrame Window

  1. #1
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    Post Problem In JFrame Window

    Hi All,

    /* I had created a JFrame with Jpanel having five JButtons on JPanel and their layout is set by choosing layout from menubar using of Actionlistener but problem is that effect is show after minize the window not instantly after selecting..*/

    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;

    class LayoutManagersShow implements ActionListener
    {
    JFrame jf;
    JMenuBar jb;
    JMenu jm1,jm2,jm3;
    JMenuItem m1,m2,m3,m4,m6,m7;
    JMenuItem First,Next,Last,Previous,Desire;
    JPanel jp;
    JButton b1,b2,b3,b4,b5;
    String str1;

    LayoutManagersShow()
    {
    jf=new JFrame("LayOut Appearence");
    jb=new JMenuBar();
    jm1=new JMenu("Layout");
    jm2=new JMenu("Quit");
    jm3=new JMenu("CardLayout");
    jb.add(jm1);
    jb.add(jm2);
    jf.setJMenuBar(jb);
    m1=new JMenuItem("FlowLayout");
    m2=new JMenuItem("GridLayout");
    m3=new JMenuItem("BorderLayout");

    m4=new JMenuItem("CardLayout");
    m6=new JMenuItem("Exit");
    jm1.add(m1);
    jm1.add(m2);
    jm1.add(m3);
    jm1.addSeparator();
    jm1.add(m4);

    jm2.add(m6);
    First=new JMenuItem("First");
    Next=new JMenuItem("Next");
    Last=new JMenuItem("Last");
    Previous=new JMenuItem("Previous");
    Desire=new JMenuItem("Desire");
    jf.setLayout(new FlowLayout());
    jf.setVisible(true);
    jf.setSize(400,400);

    jp=new JPanel(new FlowLayout());
    b1=new JButton("FirstButton");
    b2=new JButton("SecondButton");
    b3=new JButton("ThirdButton");
    b4=new JButton("FourthButton");
    b5=new JButton("FifthButton");
    jp.add(b1);
    jp.add(b2);
    jp.add(b3);
    jp.add(b4);
    jp.add(b5);
    b1.addActionListener(this);
    b2.addActionListener(this);
    b3.addActionListener(this);
    b4.addActionListener(this);
    b5.addActionListener(this);
    jp.setBackground(new Color((float)Math.random(),(float)Math.random(),(f loat)Math.random()));
    jp.setPreferredSize(new Dimension(250,250));
    jp.setVisible(true);
    jf.add(jp);
    m1.addActionListener(this);
    m2.addActionListener(this);
    m3.addActionListener(this);
    m4.addActionListener(this);
    m6.addActionListener(this);
    First.addActionListener(this);
    Next.addActionListener(this);
    Last.addActionListener(this);
    Desire.addActionListener(this);
    Previous.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e)
    {

    if(e.getSource()==m1)
    {
    jp.setLayout(new FlowLayout());
    }
    if(e.getSource()==m2)
    {
    jp.setLayout(new GridLayout(3,2));
    }
    if(e.getSource()==m3)
    {
    jp.setLayout(new BorderLayout());
    jp.add(b1,"North");
    jp.add(b2,"South");
    jp.add(b3,"East");
    jp.add(b4,"West");
    jp.add(b5,"Center");

    }
    if(e.getSource()==m4)
    {
    jb.add(jm3);
    jm3.add(First);
    jm3.add(Next);
    jm3.add(Previous);
    jm3.add(Desire);
    jm3.add(Last);
    CardLayout c=new CardLayout(20,20);
    jp.setLayout(c);
    jp.add(b1,"t1");
    jp.add(b2,"t2");
    jp.add(b3,"t3");
    jp.add(b4,"t4");
    jp.add(b5,"t5");
    if(e.getSource()==First)
    {
    c.first(jp);

    }
    if(e.getSource()==Next){
    c.next(jp);
    }
    if(e.getSource()==Last){
    c.last(jp);

    }
    if(e.getSource()==Previous){
    c.previous(jp);
    }
    if(e.getSource()==Desire){
    c.show(jp,"t3");
    }
    }
    if(e.getSource()==m6)
    {
    System.exit(0);
    }
    }

    public static void main(String...s)
    {
    LayoutManagersShow lms=new LayoutManagersShow();
    }

    }


  2. #2
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    Default Re: Problem In JFrame Window

    Welcome! Please read this topic to learn how to post code correctly and other useful info for new members.

    Too much code posted improperly. Please fix it using the instructions in the link I've provided.

  3. #3
    Member andbin's Avatar
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    Default Re: Problem In JFrame Window

    Quote Originally Posted by Suryanshi View Post
    I had created a JFrame with Jpanel having five JButtons on JPanel and their layout is set by choosing layout from menubar using of Actionlistener but problem is that effect is show after minize the window not instantly after selecting..
    First, always use the good practice to invoke aFrame.setVisible(true) only after all GUI creation/setup.
    Second, when you use JFrame always configure the "default close operation" (see setDefaultCloseOperation).
    Third, when a layout (either adding/removing components or changing layout manager) is changed into a container, the layout must be revalidated. This is generally done invoking a validate() on the container. In your case jp.validate();

    Other note: for what I see, the handling of First, Next, etc... is not appropriate into the if(e.getSource()==m4). Those handlings are distinct from the action of the m4.

    And final note: please give "good" names to variables ..... not m1, m2, jb, etc... which are a bit ugly.
    Andrea, www.andbin.net SCJP 5 (91%) SCWCD 5 (94%)

    Useful links for Java beginners My new project Java Examples on Google Code

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