1. Write a program to count the occurrences of each repeating character in a given string.

2. What is Dynamic Routing in Networking?

3. Given an array of integers, find the maximum product of any three elements in the array. The array may contain both positive and negative numbers.

4. What are the basics of Collections in Java?

5. Write a Java program to find the second highest number from an Integer array without creating any new array.