5. util包
5.1. 架构
http://www.scala-lang.org/docu/files/collections-api/collections.html
The following figure shows all collections in package scala.collection. Thes
import org.apache.commons.lang.StringUtils;
public class Test {
public static void main(String[] args) {
List list = new ArrayList();
list.add("1");
list.add("2");
list.add("3");
