Here you can find the source of minuscula(char c)
public static char minuscula(char c)
//package com.java2s; //License from project: Apache License public class Main { public static char minuscula(char c) { if (c >= 65 && c <= 90) { return (char) (c + 32); } else {//from w w w . j a v a 2 s. co m return c; } } }