Problem in layout, please help in correcting code

Question

Hello Friends,
I am facing a very strange problem. I have 1 DespktopPane, say DT in which I have created two InternalFrames, say IF1 and IF2. Also there are two JPanels, say P1 and P2. P1 contains various controls and IF1s ContentPane is set to P1 and P2 contains nothing. There two MenuItems, say M1 and M2. On M1s click I displayed IF1 and on M2s click I displayed IF2. Before adding IF2 everything is working fine, i.e. all the controls are able to display on IF1 but after adding IF2 allthe controls are transferred from IF1 to IF2 and now IF1 displays as a blank screen and IF2 contains allthe controls which are added in JPanel p2 whereas IF2s ContenPane is set to P2 and no control is added in P2.
For your reference, here is the code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MDILayout extends JFrame implements ActionListener
    private static JFrame frame = null;
    private static JDesktopPane desktop = null;
    private static JInternalFrame intframe = null;
    private static JInternalFrame rangeframe = null;
    private static JPanel panel = null;
    private static Image img = null;
    private static JMenuBar menubar = null;
    private static JMenu mfile = null;
    private static JMenuItem bexit = null;
    private static JMenuItem borders = null;
    private static JMenuItem boption = null;
    JButton bcancel,bquery,bexecute,bupdate,bnext,bprev;
    JLabel lheader,lheader1,lheader2,lheader3,lline,lline1,
    lodate,lquality,ltype,lparty,lindent,lsize,lmul,lgsm,lquantity,ldest,lorderno;
    JTextField todate,tquality,ttype,tparty,tindent,tlength,twidth,tgsm,tquantity,tdest,torderno;
    JComboBox cbotype;
    Font bigfont,bigfont1;
    static String ltext="",ltext1="",ltext2="",ltext3="";
    Panel p; Graphics g;
    MDILayout()
        frame = new JFrame("Deckle Suite (Board)");
        desktop = new JDesktopPane();
        intframe = new JInternalFrame("Orders",true,true,true,true);          
        rangeframe = new JInternalFrame("Machine - Deckle Range",true,true,true,true);           
        frame.setSize(1024,738);
        frame.setResizable(false);
        intframe.setSize(1000,680);
        rangeframe.setSize(500,350);
        JPanel p1=(JPanel)getContentPane();
        p1.setLayout(null);
        JPanel p2=(JPanel)getContentPane();
        p2.setLayout(null);
        intframe.setContentPane(p1);
        rangeframe.setContentPane(p2);
        frame.setContentPane(desktop);
        desktop.add(intframe);
        desktop.add(rangeframe);
        intframe.setMaximizable(true);
        intframe.setResizable(false);
        rangeframe.setMaximizable(true);
        rangeframe.setResizable(false);
        intframe.setContentPane(p1);
        intframe.setDefaultCloseOperation(HIDE_ON_CLOSE);
        rangeframe.setContentPane(p2);
        rangeframe.setDefaultCloseOperation(HIDE_ON_CLOSE);
        menubar = new JMenuBar();
        mfile = new JMenu("File");
        bexit = new JMenuItem("Exit");
        borders = new JMenuItem("Orders");
        boption=new JMenuItem("Options");
        menubar.add(mfile);
        mfile.add(borders);
        mfile.add(boption);
        mfile.add(bexit);
        frame.setJMenuBar(menubar);
        ltext="==========";
        for(int i=0;i<6;i++)
                ltext1=ltext+ltext1;
                ltext=ltext1;
        ltext2="----------";
        for(int j=0;j<6;j++)
                ltext3=ltext2+ltext3;
                ltext2=ltext3;
        bigfont=new Font("Monotype Corsiva",Font.BOLD,35);
        bigfont1=new Font("Times New Roman",Font.PLAIN,20);
        lheader=new JLabel("Deckle Suite (Board)");
        lheader1=new JLabel("Khanna  Paper  Mill (Pvt.) Ltd.");
        lheader2=new JLabel("Fatehgarh Road");
        lheader3=new JLabel("Amritsar");
        lline=new JLabel(ltext1);
        lline1=new JLabel(ltext3);
        lodate=new JLabel("Order Date");
        lquality=new JLabel("Quality");
        ltype=new JLabel("Sheet/Reel");
        lparty=new JLabel("Party");
        lindent=new JLabel("Indent No.");
        lsize=new JLabel("Size");
        lmul=new JLabel("x");
        lgsm=new JLabel("GSM");
        lquantity=new JLabel("Quantity");
        ldest=new JLabel("Destination");
        lorderno=new JLabel("Line No.");
        todate=new JTextField(50);
        tquality=new JTextField(50);
        ttype=new JTextField(20);
        cbotype=new JComboBox();
        tparty=new JTextField(200);
        tindent=new JTextField(50);
        tlength=new JTextField(35);
        twidth=new JTextField(35);
        tgsm=new JTextField(20);
        tquantity=new JTextField(35);
        tdest=new JTextField(200);
        torderno=new JTextField(200);
        lheader.setBounds(350,50,500,50);
        lheader1.setBounds(370,100,500,30);
        lheader2.setBounds(430,130,200,30);
        lheader3.setBounds(460,160,200,30);
        lline.setBounds(0,200,3000,30);
        lline1.setBounds(0,350,3000,30);
        lorderno.setBounds(40,240,100,20);
        lodate.setBounds(40,270,100,20);
        lquality.setBounds(320,270,100,20);
        ltype.setBounds(40,400,70,20);
        lparty.setBounds(40,300,70,20);
        lindent.setBounds(40,430,100,20);
        lsize.setBounds(450,430,50,20);
        lmul.setBounds(560,430,50,20);
        lgsm.setBounds(40,460,50,20);
        lquantity.setBounds(320,460,50,20);
        ldest.setBounds(40,490,100,20);
        torderno.setBounds(120,240,100,20);
        todate.setBounds(120,270,100,20);
        tquality.setBounds(380,270,200,20);
        cbotype.setBounds(120,400,90,20);
        tparty.setBounds(120,300,700,20);
        tindent.setBounds(120,430,200,20);
        tlength.setBounds(490,430,60,20);
        twidth.setBounds(580,430,60,20);
        tgsm.setBounds(120,460,80,20);
        tquantity.setBounds(380,460,80,20);
        tdest.setBounds(120,490,500,20);
        cbotype.addItem("SHEET");
        cbotype.addItem("REEL");
        p1.add(lheader);
        p1.add(lheader1);
        p1.add(lheader2);
        p1.add(lheader3);
        p1.add(lline);
        p1.add(lline1);
        p1.add(lodate);
        p1.add(todate);
        p1.add(lquality);
        p1.add(tquality);
        p1.add(lparty);
        p1.add(tparty);
        p1.add(ltype);
        p1.add(cbotype);
        p1.add(lindent);
        p1.add(tindent);
        p1.add(lsize);
        p1.add(tlength);
        p1.add(lmul);
        p1.add(twidth);
        p1.add(lgsm);
        p1.add(tgsm);
        p1.add(lquantity);
        p1.add(tquantity);
        p1.add(ldest);
        p1.add(tdest);
        p1.add(lorderno);
        p1.add(torderno);
        lheader.setFont(bigfont);
        lheader1.setFont(bigfont1);
        lheader2.setFont(bigfont1);
        lheader3.setFont(bigfont1);
        lheader.setForeground(Color.blue);
        lheader1.setForeground(Color.gray);
        lheader2.setForeground(Color.gray);
        lheader3.setForeground(Color.gray);
        bcancel=new JButton("Refresh");
        bquery=new JButton("Query");
        bexecute=new JButton("Execute");
        bupdate=new JButton("Update");
        bnext=new JButton("Next");
        bprev=new JButton("Previous");
        bcancel.addActionListener(this);
        bquery.addActionListener(this);
        bexecute.addActionListener(this);
        bupdate.addActionListener(this);
        bnext.addActionListener(this);
        bprev.addActionListener(this);
        borders.addActionListener(this);
        boption.addActionListener(this);;
        bexit.addActionListener(this);
        bcancel.setBounds(250,550,200,25);
        p1.add(bcancel);
        bquery.setBounds(450,550,200,25);
        p1.add(bquery);
        bexecute.setBounds(650,550,200,25);
        p1.add(bexecute);
        bupdate.setBounds(250,575,200,25);
        p1.add(bupdate);
        bprev.setBounds(450,575,200,25);
        p1.add(bprev);
        bnext.setBounds(650,575,200,25);
        p1.add(bnext);
        torderno.setEnabled(false);
        todate.setEnabled(false);
        bcancel.setEnabled(true);
        bexecute.setEnabled(false);
        bquery.setEnabled(false);
        bprev.setEnabled(false);
        bnext.setEnabled(false);
        bupdate.setEnabled(false);
        frame.show();
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
    public static void main(String args[])
        MDILayout layout=new MDILayout();
    public void actionPerformed(ActionEvent ae)
        if (ae.getSource()==borders)
          intframe.show();
          intframe.repaint();
        if (ae.getSource()==boption)
          rangeframe.show();
          rangeframe.repaint();
}Please provide me the solution so that P1 appears in IF1 and P2 appears in P2.
Thanks in advance,
Ankur

Answer 1

all the controls are able to display on IF1 but after adding IF2 allthe controls are transferred from IF1 to IF2 and now IF1 displays as a blank screen
You can't have components at more than one place in the hierarchy. If you add a component to something it is removed from its existing parent if there is one.
I'm not sure how much that helps you - I took one look at your code and ran away screaming.