/**
?*?{@link?User}?{@link?Repository}
?*/
@Repository
public?class?UserRepository?{

????/**
?????*?采用內存型的存儲方式->Map
?????*/
????private?final?ConcurrentMap<Integer,?User>?repository?=?new?ConcurrentHashMap<>();

????private?final?static?AtomicInteger?idGenerator?=?new?AtomicInteger();

????/**
?????*?保存用戶對象
?????*
?????*?@param?user?{@link?User}?對象
?????*?@return?如果保存成功，返回<code>true</code>,
?????*?否則返回<code>false</code>
?????*/
????public?boolean?save(User?user)?{
????????//ID從1開始
????????Integer?id?=?idGenerator.incrementAndGet();
//????????設置ID
????????user.setId(id);
????????return?repository.put(id,?user)?==?null;
????}

????/**
?????*?返回所有用戶
?????*
?????*?@return
?????*/
????public?Collection<User>?findAll()?{
????????return?repository.values();
????}
}