// 不是org.apache.commons.collections.CollectionUtils,是java自带的java.util.Collections
// List<String> list = Collections.synchronizedCollection(new ArrayList<String>());//报错
// List<String> list = Collections.synchronizedCollection(new ArrayList<>()); //报错
List<String> all1 = Collections.synchronizedList(new ArrayList<>());
List<String> all2 = Collections.synchronizedList(new ArrayList<String>());
List<String> all3 = Collections.synchronizedList(new ArrayList<>(10));
以上基于jdk1.8