Here you can find the source of toLowerCase(String[] strArr)
static String[] toLowerCase(String[] strArr)
//package com.java2s; //License from project: Apache License public class Main { static String[] toLowerCase(String[] strArr) { if (strArr == null) return null; String[] res = new String[strArr.length]; for (int i = 0; i < strArr.length; i++) { res[i] = strArr[i].toLowerCase(); }//from w w w .j a va 2 s . c o m return res; } }