errors while devoloping a frame based checkbox application

[chandan kuchipudi]

hi ......i'm very new to java...i'm learning core java for 2 months....i'm getting errors while devoloping a frame based checkbox application ....please look into that and help me to devolope that ...sorry for my bad english ..


here is the program

//CbDemo.java

import java.awt.*;
import java.awt.event.*;
class Cb extends Frame 
{
	Checkbox cb1;
	Label l1,l2;
	Cb()
	{
		setTitle("checkbox example");
		setSize(200,200);
		FlowLayout fl=new FlowLayout();
		setLayout(fl);


		// create the components

		cb1=new Checkbox("java");
		l1=new Label("select the course");
		l2=new Label();

		// add components to container

		add(l1);add(cb1);add(l2);

		// registration 

		Sathya so=new Sathya();
		cb1.addItemListener(so);
		setVisible(true);

	}//cb ()

	class Sathya implements ItemListener

	{
		public void ItemStateChanged(ItemEvent ie)
		{
			if(ie.getSource()==cb1)
			{
				if(cb1.getState())
				{
					l2.setText("your selected course:"+cb1.getLabel());
				}
				else
				{
					l2.setText("please select a course");
				}
			}//if
		}//isc
	}//sathya
	}//cb
	class CbDemo
	{
		public static void main (String []args)
		{
			Cb co=new Cb();
		}
	}

//it is showing that line no. 34 is an error ....

Cb.Sathya is not abstract method and does not override abstract method ItemStateChanged(ItemEvent) in ItemListener

please let me know what is wrong in that .....thank you ..

[Added code tags - see UseCodeTags for details]

[Matthew Brown]

Look at the method in ItemListener. Look at the method you've implemented. Compare them, carefully. And remember that Java is case sensitive.

[chandan kuchipudi]

thank you matthew .....i've changed "i" .....but still it is showing error like this

line no 53 error : Cb is abstract;cannot be instantiated...

Cb co =new Cb();


i've written it as a part of execution logic class....please look it once...

[chandan kuchipudi]

thankyou ....i got the output finally .....