Here you can find the source of toUpperCase(String[] header)
private static String[] toUpperCase(String[] header)
//package com.java2s; //License from project: Open Source License public class Main { private static String[] toUpperCase(String[] header) { for (int i = 0; i < header.length; i++) { header[i] = header[i].toUpperCase(); }// ww w .ja va2 s . c om return header; } }