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How to initialize Singleton?
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| companion object { | |
| @Volatile | |
| private var INSTANCE: WordRoomDatabase? = null | |
| fun getDatabase(context: Context): WordRoomDatabase { | |
| return INSTANCE ?: synchronized(this) { | |
| val instance = Room.databaseBuilder(context.applicationContext, WordRoomDatabase::class.java, "word_database").build() | |
| INSTANCE = instance | |
| // return instance | |
| instance | |
| } | |
| } | |
| } | |
| -------------------------------------------------------- | |
| private lateinit var INSTANCE: TitleDatabase | |
| fun getDatabase(any_param_you_might_need): return_type { | |
| synchronized(TitleDatabase::class or this) { | |
| if (!::INSTANCE.isInitialized) { | |
| INSTANCE = initialize_here | |
| } | |
| } | |
| return INSTANCE | |
| } | |
| ---------------------------------------------------- | |
| public class Solution { | |
| private volatile static Solution uniqueInstance; | |
| private Solution() { | |
| } | |
| @Override | |
| public String toString() { | |
| return String.valueOf(solutionHashMap); | |
| } | |
| public static Solution getInstance() { | |
| if (uniqueInstance == null) { | |
| synchronized (Solution.class) { | |
| if (uniqueInstance == null) { | |
| uniqueInstance = new Solution(); | |
| } | |
| } | |
| } | |
| return uniqueInstance; | |
| } | |
| } | |
| ---------------------------------------------------------------------- | |
| companion object { | |
| private lateinit var sInstance: StockLiveData | |
| @MainThread | |
| fun get(symbol: String): StockLiveData { | |
| sInstance = if (::sInstance.isInitialized) sInstance else StockLiveData(symbol) | |
| return sInstance | |
| } | |
| } |
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