Logical Interview Question

How to convert String Characters.  lower to upper and upper to lower How to Convert all the String character Upper and lower . If String character is lower than convert Upper If it is Upper than you have to convert a lower. I am going to introduce it is a very simple and easy way. String Conversion is very easy through the toUpperCase() and toLowerCase(); Method But I am going to do this Question without using the Inbuilt method in the class. You have to do this Only For logical coding Question. So, Finally, I am going to do this Question step-by-step if you want to watch videos than you can watch. In these videos, I discuss this question in a very simple and easy way. You have to take one class with the main method.                class Test{                 public static void main(){                    //your logic ...