线程不安全类 线程安全类

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不安全	安全
StringBuilder	StringBuffer
SimpleDateFormat	jodaTime  org.joda.time.format.DateTimeFormatter;
ArrayList	public static Map<Integer,Integer> map = Collections.synchronizedMap( new HashMap<>() ); public static List<Integer> list = new CopyOnWriteArrayList<>();
HashMap	public static Map<Integer,Integer> list = new ConcurrentHashMap<>() ; 或 public static Map<Integer,Integer> list = new ConcurrentSkipListMap<>() ;
Set(HashSet、TreeSet)	public static Set<Integer> list = new CopyOnWriteArraySet<>(); 或 public static Set<Integer> list = new ConcurrentSkipListSet<>();

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