Here you can find the source of toLowerCase(char ch)
public static char toLowerCase(char ch)
//package com.java2s; //License from project: Open Source License public class Main { public static char toLowerCase(char ch) { StringBuffer sb = new StringBuffer(); sb.append(ch);/* w w w . j a v a 2 s . co m*/ char[] arr = sb.toString().toLowerCase().toCharArray(); return arr[0]; } }