What is the difference between an int and an Integer in Java and C#?

Question

I was reading More Joel on Software when I came across Joel Spolsky saying something about a particular type of programmer knowing the difference between an i

Answer 1

In java as per my knowledge if you learner then, when you write int a; then in java generic it will compile code like Integer a = new Integer(). So,as per generics Integer is not used but int is used. so there is so such difference there.