public class FinalDemo 
{
	/**
	 * final keyword with variable use to define constants 
	 * here 'a' variable is constant that is value of 'a' will 
	 * not change
	 */
	final int a=10;	
	public void disp()
	{
		System.out.println("value of a = "+a);
	}
	public void show(){
		a=20;	//this will create compilation error
		System.out.println("value of a ="+a);
	}
	public static void main(String[] args) 
	{
		FinalDemo fd=new FinalDemo();
		fd.disp();
		fd.show();	
	}
}

class Account 
{
	/**
	 * final keyword with methods mean that method will not be 
	 * overridden by sub class
	 */
	public final void acconutNumber()
	{
		System.out.println("this is accountNumber method");
	}
	public void emi()
	{
		System.out.println("Account emi method");
	}
}
class CurrentAccount extends Account
{
	public void emi()
	{
		System.out.println("Current Account emi method");
	}
}
public class Test
{
	public static void main(String[] args) 
	{
		CurrentAccount ca=new CurrentAccount();
		ca.acconutNumber();
		ca.emi();
	}
}

this is accountNumber method
Current Account emi method

final class Account 
{
	/**
	 * final keyword with class mean that class will not be 
	 * inherit by sub class
	 */
	public void acconutNumber()
	{
		System.out.println("this is accountNumber method");
	}
	public void emi()
	{
		System.out.println("Account emi method");
	}
}
class CurrentAccount extends Account	//show compile time error
{
	public void emi()
	{
		System.out.println("Current Account emi method");
	}
}
public class Test
{
	public static void main(String[] args) 
	{
		CurrentAccount ca=new CurrentAccount();
		ca.acconutNumber();
		ca.emi();
	}
}