Refactor IncrementOperator class main method

Refactor IncrementOperator class to use IO for output and simplify main method.

Author: janbodnar

pitfalls/IncrementOperator.java

@@ -1,20 +1,15 @@
-package com.zetcode;
-
 // there is a subtle difference between the 
 // prefix and suffix increment operators
 
-public class IncrementOperator {
-
-    public static void main(String[] args) {
+void main() {
 
-        int num = 0;
+    int num = 0;
 
-        num = num++;
+    num = num++;
 
-        System.out.println(num);
+    IO.println(num);
 
-        num = ++num;
-        
-        System.out.println(num);
-    }
+    num = ++num;
+    
+    IO.println(num);
 }