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View Poll Results: getteng next panel after minimizing and maximizing the window only why?

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Results 1 to 7 of 7

Thread: dynamically adding panels...but getteng next panel after minimizing and maximizing the window only why?

  1. #1
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    Default dynamically adding panels...but getteng next panel after minimizing and maximizing the window only why?

    import javax.swing.*;
    import java.io.*;
    import java.awt.*;
    import java.awt.event.*;
    class sacreate extends JFrame implements ActionListener
    {
     
    JLabel l1,l2,l3,l4,a,b,c;
    Container pane;
    JPanel p1,p2,p3;
    JTextField t1;
    JComboBox c1,c2;
    JCheckBox m1;
    JButton b1,b2,b3;
    public sacreate()
    {
    try
    {
    pane=getContentPane();
    l1=new JLabel("FieldName"); 
    a=new JLabel("                                       ");
    l2=new JLabel("DataType");
    b=new JLabel("                 ");
    l3=new JLabel("NotNull");
    c=new JLabel("        ");
    l4=new JLabel("Null");
    t1=new JTextField(15);
    c1=new JComboBox();
    c1.addItem("VARCHAR");
    c1.addItem("INTEGER");
    c1.addItem("CHARACTER");
    c2=new JComboBox();
    c2.addItem("PrimaryKey");
    c2.addItem("ForignKey");
    m1=new JCheckBox();
    b3=new JButton("Done");
    b1=new JButton("+");
    b2=new JButton("-");
    p1=new JPanel();
    p2=new JPanel();
    p3=new JPanel();
    p1.add(l1);
    p1.add(a);
    p1.add(l2);
    p1.add(b);
    p1.add(l3);
    p1.add(c);
    p1.add(l4);
    p2.add(t1);
    p2.add(c1);
    p2.add(c2);
    p2.add(m1);
    p2.add(b3);
    p2.add(b1);
    p2.add(b2);
    p3.add(p1);
    p3.add(p2);
    pane.add(p3);
    p1.setLayout(new FlowLayout(FlowLayout.LEFT));
    p2.setLayout(new FlowLayout(FlowLayout.LEFT));
    p3.setLayout(new BorderLayout());
    p3.add(p1,BorderLayout.NORTH);
    p3.add(p2,BorderLayout.SOUTH);
    setLayout(new FlowLayout());
    b1.addActionListener(this);
    b2.addActionListener(this);
    }
    catch(Exception e)
    {
    System.out.println(e.toString());
    }
    }
    public void actionPerformed(ActionEvent ae)
      {
    JPanel p = new JPanel();
    Dimension size=p.getSize();
    System.out.println(size);
    p.setPreferredSize(new Dimension(1600,35));
    JTextField t=new JTextField(15);
    JComboBox m=new JComboBox();
    m.addItem("VARCHAR");
    m.addItem("INTEGER");
    m.addItem("CHARACTER");
    JComboBox n=new JComboBox();
    n.addItem("PrimaryKey");
    n.addItem("ForignKey");
    JCheckBox c=new JCheckBox();
    JButton o=new JButton("Done");
    JButton r=new JButton("+");/*after pressing this '+' button i have to get next panel with some components but by clicking '+' and by minimizing and maximizing the window only i am able to see the next panel why?*/
    r.addActionListener(this);
    JButton q=new JButton("-");
    q.addActionListener(this);
    if(ae.getActionCommand()=="+")
     {
    pane.add(p);
    p.add(t);
    p.add(m);
    p.add(n);
    p.add(c);
    p.add(o);
    p.add(r);
    p.add(q);
    p.revalidate(); 
    p.setLayout(new FlowLayout());
    }
    if(ae.getActionCommand()=="-")
    {
    /*p.remove(t);
    p.remove(m);
    p.remove(n);
    p.remove(c);
    p.remove(o);
    p.remove(r);
    p.remove(q);*/
     
    pane.remove(p);
    pane.revalidate();
    pane.repaint();
    }
    }
    public static void main(String args[])
    {
    sacreate a=new sacreate();
    a.setSize(300,300);
    a.setVisible(true);
    a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    a.setLocationRelativeTo(null);
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: dynamically adding panels...but getteng next panel after minimizing and maximizing the window only why?

    Please edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: dynamically adding panels...but getteng next panel after minimizing and maximizing the window only why?

    thanx for saying i did it...

  4. #4
    Administrator copeg's Avatar
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    Default Re: dynamically adding panels...but getteng next panel after minimizing and maximizing the window only why?

    I'd recommend posting an SSCCE (see my signature) to demonstrate your problem more clearly, as well as describing your problem more clearly. Further, although you added code tags the indentation makes it quite hard for any human to read. Comments on your code: a) why the try/catch in the constructor? b) don't use == to compare strings, use the equals method. c) I'd recommend reading about java code conventions

  5. #5
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    Default Re: dynamically adding panels...but getteng next panel after minimizing and maximizing the window only why?

    i kept try catch blocks to caught the errors if any.....if it is removed also there will be no errors...but if == is not kept i am getting an error...= is used for assigning a value and where as == is used to compare to values....

  6. #6
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    Default Re: dynamically adding panels...the hope the code is help ful to you....

     
    import javax.swing.*;
    import java.io.*;
    import java.awt.*;
    import java.awt.event.*;
    class sacreate extends JFrame implements ActionListener
    {
     
    JLabel l1,l2,l3,l4,a,b,c;
    Container pane;
    JPanel p1,p2,p3;
    JTextField t1;
    JComboBox c1,c2;
    JCheckBox m1;
    JButton b1,b2,b3;
    public sacreate()
    {
     
    pane=getContentPane();
    l1=new JLabel("FieldName"); 
    a=new JLabel("                                       ");
    l2=new JLabel("DataType");
    b=new JLabel("                 ");
    l3=new JLabel("NotNull");
    c=new JLabel("        ");
    l4=new JLabel("Null");
    t1=new JTextField(15);
    c1=new JComboBox();
    c1.addItem("VARCHAR");
    c1.addItem("INTEGER");
    c1.addItem("CHARACTER");
    c2=new JComboBox();
    c2.addItem("PrimaryKey");
    c2.addItem("ForignKey");
    m1=new JCheckBox();
    b3=new JButton("Done");
    b1=new JButton("+");
    b2=new JButton("-");
    p1=new JPanel();
    p2=new JPanel();
    p3=new JPanel();
    p1.add(l1);
    p1.add(a);
    p1.add(l2);
    p1.add(b);
    p1.add(l3);
    p1.add(c);
    p1.add(l4);
    p2.add(t1);
    p2.add(c1);
    p2.add(c2);
    p2.add(m1);
    p2.add(b3);
    p2.add(b1);
    p2.add(b2);
    p3.add(p1);
    p3.add(p2);
    pane.add(p3);
    p1.setLayout(new FlowLayout(FlowLayout.LEFT));
    p2.setLayout(new FlowLayout(FlowLayout.LEFT));
    p3.setLayout(new BorderLayout());
    p3.add(p1,BorderLayout.NORTH);
    p3.add(p2,BorderLayout.SOUTH);
    setLayout(new FlowLayout());
    b1.addActionListener(this);
    b2.addActionListener(this);
    }
     
     
     
    public void actionPerformed(ActionEvent ae)
      {
     
     JTextField t;
     JComboBox m,n;
     JCheckBox c;
     JButton o,r,q;
     JPanel p;
    p = new JPanel();
    Dimension size=p.getSize();
    System.out.println(size);
    p.setPreferredSize(new Dimension(1600,35));
    t=new JTextField(15);
    m=new JComboBox();
    m.addItem("VARCHAR");
    m.addItem("INTEGER");
    m.addItem("CHARACTER");
    n=new JComboBox();
    n.addItem("PrimaryKey");
    n.addItem("ForignKey");
    c=new JCheckBox();
    o=new JButton("Done");
    r=new JButton("+");
    r.addActionListener(this);
    q=new JButton("-");
    q.addActionListener(this);
    if(ae.getActionCommand()=="+")
    {
    pane.add(p);
    p.add(t);
    p.add(m);
    p.add(n);
    p.add(c);
    p.add(o);
    p.add(r);
    p.add(q);
    p.revalidate(); 
    p.setLayout(new FlowLayout());
    }
    }
    public static void main(String args[]) 
    {
     
    SwingUtilities.invokeLater(new Runnable() 
    {
    public void run() 
    {
    sacreate a=new sacreate();
    a.setSize(1600,800);
    a.setVisible(true);
    a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    a.setLocationRelativeTo(null);
    }
    });
    }
    }

  7. #7
    Super Moderator Norm's Avatar
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    Default Re: dynamically adding panels...but getteng next panel after minimizing and maximizing the window only why?

    Please edit your post and properly format the code. It needs indentation for code within {}s.
    All statements should NOT start in the first column.
    If you don't understand my answer, don't ignore it, ask a question.

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