I have attached my code for normal reversing but Im brand new to java and Im not sure how to do this

Submit your assignment as a report. You need to do the following for each of the problems to get full points 1) Program listing with line numbers. [7 points ] 2) Create at least 3 test cases and report their output. [ 3 points 1. Write a Java method that will take a string and reverse it. Can you come up with a method that is faster than regular reversing of the for loop? 10 points 2. Write a Java program that generates a new string by concatenating the reversed substrings of even indexes and odd indexes separately from a given string. For this code you may use the above method to reverse the string 10 points Examples Input: abacacd output: dasaccb Explanation: Substring are :asad, bcc Reversed substrings are : dasa, ccb output: dasaccb