How to use readline() method in Java?

Question

I am beginner in Java, and I was reading the topic of giving values to variables through the readLine() method from the keyboard. The program for that is given

Answer 1

A DataInputStream is just a decorator over an InputStream (which System.in is) which allows to read using more convenient methods.

As to the Float.valueOf(), well, that's curious because Float has .parseFloat() as well. Here the code grabs a Float with .valueOf() which it turns into the primitive float type using .floatValue(), which is unnecessary with Java 1.5+ due to auto unboxing.

And as other answers rightly say, these methods are obsolete anyway.