Here you can find the source of toString(final List extends Object> list)
public static List<String> toString(final List<? extends Object> list)
//package com.java2s; /* *********************************************************************** * * project: org.matsim.*// w w w .j a v a2 s . co m * CollectionUtils.java * * * *********************************************************************** * * * * copyright : (C) 2013 by the members listed in the COPYING, * * LICENSE and WARRANTY file. * * email : info at matsim dot org * * * * *********************************************************************** * * * * 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 2 of the License, or * * (at your option) any later version. * * See also COPYING, LICENSE and WARRANTY file * * * * *********************************************************************** */ import java.util.ArrayList; import java.util.List; public class Main { public static List<String> toString(final List<? extends Object> list) { final List<String> strings = new ArrayList<String>(list.size()); for (Object o : list) strings.add(o.toString()); return strings; } }