讀zookeeper的源碼(zookeeper.java)時發現的，平時沒有怎么注意：

private final ZKWatchManager watchManager;List<String> getDataWatches() {synchronized(watchManager.dataWatches) {List<String> rc = new ArrayList<String>(watchManager.dataWatches.keySet());return rc;}}List<String> getExistWatches() {synchronized(watchManager.existWatches) {List<String> rc = new ArrayList<String>(watchManager.existWatches.keySet());return rc;}}List<String> getChildWatches() {synchronized(watchManager.childWatches) {List<String> rc = new ArrayList<String>(watchManager.childWatches.keySet());return rc;}}

?另數組與list的轉換：

數組-->list

String[] userid = {"aa","bb","cc"}; List<String> userList = new ArrayList<String>(); Collections.addAll(userList, userid);

數組-->list

String[] userid = {"aa","bb","cc"}; List<String> userList = Arrays.asList(userid); 另：Arrays.asList()返回一個受指定數組支持的固定大小的列表。所以不能做Add、Remove等操作。 List list = new ArrayList(Arrays.asList(userid));這樣操作就可以了。

list-->數組

List<String> strList = new ArrayList<String>(); strList.add("aa"); strList.add("bb"); Object[] objs = strList.toArray();

參考文獻：

【1】http://jingyan.baidu.com/article/86f4a73e607f2937d7526972.html

【2】https://github.com/apache/zookeeper

?

轉載于:https://www.cnblogs.com/davidwang456/p/5000470.html

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