JPanel.setSize() not working..
Check out this code friends don't know why i am not able to set the size of JPanel...
.

    import java.io.*;
    import java.util.*;
    import java.sql.*;
    //import java.applet.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    /*<applet code="k" height=400 width=400></applet>*/
    public class k extends JApplet implements ActionListener
    {
    	JButton b,tinfo;
    	JLabel l1,l2;
    	JTextField f1,f2;
    	JPanel p1;
    	CardLayout c1;
    	public void init()
    	{
    		b=new JButton("submit");
    		
    		f1=new JTextField(20);		
    		f2=new JTextField(20);
    		l1=new JLabel("username");
    		l2=new JLabel("password");
    		p1=new JPanel();
    		c1=new CardLayout();
    		add(l1);
    		add(f1);
    		add(l2);
    		add(f2);
    		add(b);
    		add(p1);
    		setLayout(new FlowLayout());
    		b.addActionListener(this);
    		
    	}
    	public void actionPerformed(ActionEvent ae)
    	{
    		//Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    		//Connection con=DriverManager.getConnection("jdbc:odbc:mohit:","system","rock");
    		try
    		{
    			Properties p=new Properties();
    			p.load(new FileInputStream("mohu.properties"));
    			String str1=f1.getText();
    			String str2=p.getProperty("username");
    			System.out.println(str1);
    			System.out.println(str2);
    			//System.out.println(Integer.toString(str2.length()));
    			if(str1.equals(str2))
    			{
    				if((f2.getText()).equals(p.getProperty("password")))
    				{
    					System.out.println("you are entered");
    				}
    				else
    				{
    					System.out.println("wrong first");
    				}
    			}
    			else
    			{
    				System.out.println("wrong second ");
    			}
    			tinfo=new JButton("teachers information");
    		p1.add(tinfo);
    			p1.setSize(200,200);
    			p1.setBackground(Color.RED);
    			//tinfo.setSize(50,50);
    			p1.setLayout(c1);
    			c1.next(p1);
    		}
    		catch(Exception ee)
    		{
    			ee.printStackTrace();
    			System.out.println("Exception caught ");
    		}
    	}
    		
    	public void paint()
    	{}
    }
JPanel.setSize() not working..
===

Check out this code friends don't know why i am not able to set the size of JPanel...
.

    import java.io.*;
    import java.util.*;
    import java.sql.*;
    //import java.applet.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    /*<applet code="k" height=400 width=400></applet>*/
    public class k extends JApplet implements ActionListener
    {
    	JButton b,tinfo;
    	JLabel l1,l2;
    	JTextField f1,f2;
    	JPanel p1;
    	CardLayout c1;
    	public void init()
    	{
    		b=new JButton("submit");
    		
    		f1=new JTextField(20);		
    		f2=new JTextField(20);
    		l1=new JLabel("username");
    		l2=new JLabel("password");
    		p1=new JPanel();
    		c1=new CardLayout();
    		add(l1);
    		add(f1);
    		add(l2);
    		add(f2);
    		add(b);
    		add(p1);
    		setLayout(new FlowLayout());
    		b.addActionListener(this);
    		
    	}
    	public void actionPerformed(ActionEvent ae)
    	{
    		//Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    		//Connection con=DriverManager.getConnection("jdbc:odbc:mohit:","system","rock");
    		try
    		{
    			Properties p=new Properties();
    			p.load(new FileInputStream("mohu.properties"));
    			String str1=f1.getText();
    			String str2=p.getProperty("username");
    			System.out.println(str1);
    			System.out.println(str2);
    			//System.out.println(Integer.toString(str2.length()));
    			if(str1.equals(str2))
    			{
    				if((f2.getText()).equals(p.getProperty("password")))
    				{
    					System.out.println("you are entered");
    				}
    				else
    				{
    					System.out.println("wrong first");
    				}
    			}
    			else
    			{
    				System.out.println("wrong second ");
    			}
    			tinfo=new JButton("teachers information");
    		p1.add(tinfo);
    			p1.setSize(200,200);
    			p1.setBackground(Color.RED);
    			//tinfo.setSize(50,50);
    			p1.setLayout(c1);
    			c1.next(p1);
    		}
    		catch(Exception ee)
    		{
    			ee.printStackTrace();
    			System.out.println("Exception caught ");
    		}
    	}
    		
    	public void paint()
    	{}
    }