709_To Lower Case

/*709_To Lower Case
Runtime: 0 ms, faster than 100.00% of Java online submissions for To Lower Case.
Memory Usage: 37.6 MB, less than 45.69% of Java online submissions for To Lower Case.
*/
class Solution {
    public String toLowerCase(String str) {
     
        char[] arr=str.toCharArray();
        
    for(int i=0;i<str.length();i++)
        if(arr[i]>= 'A' && arr[i]<='Z')
            arr[i]+=32;
       
        return new String(arr);
        
        //return str.toLowerCase();
    }
}