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

public class SelectLayout extends JFrame implements ItemListener{
public static void main (String[] args) {
SelectLayout sl=new SelectLayout();
}
    
    JMenuBar menuBar;
    JMenu lmenu,cmenu;
    JRadioButtonMenuItem lrbmenuItem,crbmenuItem;
    JPanel menuPanel,bPanel;
    JButton button;
    public SelectLayout() {
    	super("Select Layout in swing");
    	menuPanel=new JPanel();
    	menuBar=new JMenuBar();
    	lmenu=new JMenu("layout");
    	ButtonGroup gp=new ButtonGroup();
    	lrbmenuItem =new JRadioButtonMenuItem("BorderLayout");
    	lrbmenuItem.setMnemonic(KeyEvent.VK_B);
    	lrbmenuItem.addItemListener(this);
    	gp.add(lrbmenuItem);
    	lmenu.add(lrbmenuItem);
    	lrbmenuItem =new JRadioButtonMenuItem("FlowLayout");
    	lrbmenuItem.setMnemonic(KeyEvent.VK_F);
    	lrbmenuItem.addItemListener(this);
    	lrbmenuItem.setSelected(true);
    	gp.add(lrbmenuItem);
    	lmenu.add(lrbmenuItem);
    	lrbmenuItem =new JRadioButtonMenuItem("GridLayout");
    	lrbmenuItem.setMnemonic(KeyEvent.VK_G);
    	lrbmenuItem.addItemListener(this);
    	gp.add(lrbmenuItem);
    	lmenu.add(lrbmenuItem);
    	lrbmenuItem =new JRadioButtonMenuItem("CardLayout");
    	lrbmenuItem.setMnemonic(KeyEvent.VK_C);
    	lrbmenuItem.addItemListener(this);
    	gp.add(lrbmenuItem);
    	lmenu.add(lrbmenuItem);
    	menuBar.add(lmenu);
    	
    	//second menu
    	cmenu=new JMenu("CardLayout");
    	crbmenuItem =new JRadioButtonMenuItem("First");
    	crbmenuItem.setMnemonic(KeyEvent.VK_F);
    	crbmenuItem.setSelected(true);
    	crbmenuItem.addItemListener(this);
    	gp.add(crbmenuItem);
    	cmenu.add(crbmenuItem);
    	crbmenuItem =new JRadioButtonMenuItem("last");
    	crbmenuItem.setMnemonic(KeyEvent.VK_L);
    	crbmenuItem.addItemListener(this);
    	gp.add(crbmenuItem);
    	cmenu.add(crbmenuItem);
    	crbmenuItem =new JRadioButtonMenuItem("next");
    	crbmenuItem.setMnemonic(KeyEvent.VK_N);
    	crbmenuItem.addItemListener(this);
    	gp.add(crbmenuItem);
    	cmenu.add(crbmenuItem);
    	crbmenuItem =new JRadioButtonMenuItem("previous");
    	crbmenuItem.setMnemonic(KeyEvent.VK_P);
    	crbmenuItem.addItemListener(this);
    	gp.add(crbmenuItem);
    	cmenu.add(crbmenuItem);
    	cmenu.setEnabled(false);
    	menuBar.add(cmenu);
    	menuPanel.add(menuBar);
    	add(menuPanel,BorderLayout.NORTH);
    	
    	
    	bPanel=new JPanel();
    	for (int i = 0; i<4; i++) {
    	 	button=new JButton("button");
    	 	bPanel.add(button);
        }	 
        	bPanel.setLayout(new GridLayout());
        add(bPanel,BorderLayout.CENTER);
     
    	//setLayout(new FlowLayout());
    	setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    	setSize(400,400);
        setVisible(true);
     }    	
       


     	public void itemStateChanged(ItemEvent e)
    	{
    		if(e.paramString().equals("BorderLayout"))
    		{   
                 bPanel.setLayout(new BorderLayout());}
  	        if(e.paramString().equals("FlowLayout"))
    			button.setLayout(new FlowLayout());
    		if(e.paramString().equals("GridLayout"))
    			bPanel.setLayout(new GridLayout(2,2));
    		if(e.paramString().equals("CardLayout"))
    		{
    		    cmenu.setEnabled(true);
    			setLayout(new CardLayout());}
    	}
}

No comment other than read the rules?

Seems like a reasonable comment to me.

I would also add: ask a question or describe the problem. Don't just dump the code and say "fix this".

even if ... try to use code tags .. ain't even thinking of reading it like this

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