Blank Final in Java

// A sample Java program to demonstrate use and
// working of blank final
class Test {
    // We can initialize here, but if we initialize here,
    // then all objects get the same value.  So we use blank
    // final
    final int i;

    Test(int x)
    {
        // Since we have already declared i as final above,
        // we must initialize i in constructor. If we remove
        // this line, we get compiler error.
        i = x;
    }
}

// Driver Code
class Main {
    public static void main(String args[])
    {
        Test t1 = new Test(10);
        System.out.println(t1.i);

        Test t2 = new Test(20);
        System.out.println(t2.i);
    }
}

// A Java program to demonstrate that we can
// use constructor chaining to initialize
// final members
class Test
{
    final public int i;

    Test(int val)    {  this.i = val;  }

    Test()
    {
        // Calling Test(int val)
        this(10);
    }

    public static void main(String[] args)
    {
        Test t1 = new Test();
        System.out.println(t1.i);

        Test t2 = new Test(20);
        System.out.println(t2.i);
    }
}