Reverse of a string in optimized way

Most of the time we came a cross to reverse of a string in interview and interviewer always say it should be optimized.
There are so many ways to reverse a string one of them is mentioned below.

public class StringReverse {
    
    public static void main(String arg[])
    {
        String string="I AM MIKE MORTAN";
        char[] tempCharArray=string.toCharArray();
        int start,end=0;
        end=tempCharArray.length-1;
        for(start=0;start<end;start++,end--)
        {
            char temp=tempCharArray[start];
            tempCharArray[start]=tempCharArray[end];
            tempCharArray[end]=temp;
        }
        
        System.out.println(new String(tempCharArray));
    }

}

In this way we will reverse the string in half of the iteration of a given string, rather than traversing complete string from start to end.