IDemo1.java

// program showing the concept of block
class IDemo1
{
    public static void main(String args[])
    {
        int a = 100;
        System.out.println("value of a : "+a);
            {
                int b=200;
                System.out.println("value of a : "+a);
                System.out.println("value of b : "+b);
            }
//            System.out.println("value of b : "+b);
    }
}