Difference in Java casting

Question

What is the difference between the 2 codes below?

first

int x = 10;
float i = (float) x;

2nd

int x = 10;
float i = Float.parseFloat(x);

Answer 1

It’s very simple, the first works and the second doesn’t, it doesn’t make sense to make a Parsing in an integer number, only in strings. So documentation shows that only one string.

Alias the method name is a "prime":P

The first indicates that a number that was integer must be interpreted as a type of binary floating point. There will be a conversion because the formatted ones of each type is different. In fact it works without it, there is an implicit conversion of int for float in accordance with language specification.