Here you can find the source of toNonNull(String str)
public static String toNonNull(String str)
//package com.java2s; /*/*from w ww .ja v a2s. c om*/ Copyright (C) 2012 Akira Midorikawa This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { public static String toNonNull(String str) { return str == null ? "" : str; } }