Reverse Given String Without Using Temporary Variable

Reverse Given String Without Using Temporary Variable.

Example:
Input : hello
Output: olleh

Input : abcd
Output : dcba

Implementation

class ReverseStringWithoutUsingTemporaryVariable{
static String reverse(char []array){
int start = 0;
int end = array.length-1;
while(start < end){
array[start] ^= array[end];
array[end] ^= array[start];
array[start] ^= array[end];
start++; 
end--;
}
return new String(array);
}

static String reverseUtil(String str){
//Boundary Condition
if(str == null || str.length() == 0)
return null;

return reverse(str.toCharArray());
}

public static void main(String... args){
String str = "hello";
String reverse = reverseUtil(str);
System.out.println(reverse);
}
  }

Output: hello