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我想實現一個單件模式，用於連接到我的MongoDB數據庫，以確保我只有一個connection.I已經寫了下面的代碼'MongoDB的連接器Singleton模式
public enum MongoConnector {
\t CONNECTION;
\t private MongoClient client = null;
\t /**
\t * This function is used to create a single instance of the MongoDb connector
\t * Thread Pooling is handled internally by MongoDb
\t */
\t private MongoConnector() {
\t \t try {
\t \t \t client = new MongoClient();
\t \t } catch (Exception e) {
\t \t \t e.printStackTrace();
\t \t }
\t }
\t public MongoClient getClient() {
\t \t if (client == null) {
\t \t \t throw new RuntimeException();
\t \t }
\t \t return client;
\t }
}所以我想知道這是否確保單身模式。如果不是，請讓我知道它應該如何。謝謝