How to reverse a string using array in java?

Answer 1

Use Reverse Function of StringBuffer Class:

StringBuffer sbf = new StringBuffer("Mostafa!");

        System.out.println("String buffer = " + sbf);
        sbf.reverse();
        System.out.println(sbf)

Answer 2

Yes, maybe when u learned java core and basic structures and algorithms. But this is Learning Resource, and it's good to know how things work before u use them. And yes i know they ask you those things at Google interviews for example. Whiteboard all the way. Of course if you are lazy and dont wanna study stuff - your choice. Not saying you have to learn bytecode, but general idea of what's happening in JVM will help.

Answer 3

Did u try anything at all? Or u want the whole answer?

Answer 4

Because in many companies you will be using/writing their own proprietary libraries, and they want to see that u can write your own solutions.