344. Reverse String

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh".

Solution:

There are so many solutions:

Stringbuilder, charArray ....

 public String reverseString(String s) {  
     return new StringBuilder(s).reverse().toString();  
   }  

  public String reverseString(String s) {  
     StringBuilder sb=new StringBuilder();  
     for(int i=s.length()-1;i>=0;i--) sb.append(s.charAt(i));  
     return sb.toString();  
   }