leetcode 709. To Lower Case

Seawolf

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

 

Example 1:

Input: "Hello"
Output: "hello"
Example 2:

Input: "here"
Output: "here"
Example 3:

Input: "LOVELY"
Output: "lovely"

class Solution {
    public String toLowerCase(String str) {
        
        String re = "";
        
        for(int i = 0; i <str.length() ; i++){
            
            if(str.charAt(i) >= 'A' && str.charAt(i)<= 'Z') re = re +(char) ((int)str.charAt(i) + 32);
            
            else re = re + str.charAt(i);
        }
        
        return re;
    }
}