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/**

* mplement 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"

*/

public class ToLowerCase709 {

public String toLowerCase(String str) {

return str.toLowerCase();

}

/**

* https://leetcode.com/problems/to-lower-case/discuss/148993/Java-no-library-methods

*/

public String toLowerCase2(String str) {

char[] a = str.toCharArray();

for (int i = 0; i < a.length; i++)

if ('A' <= a[i] && a[i] <= 'Z')

a[i] = (char) (a[i] - 'A' + 'a');

return new String(a);

}

}