差異處
這裏顯示兩個版本的差異處。
| Both sides previous revision 前次修改 下次修改 | 前次修改 | ||
|
java:effective_java:concurrency:use_lazy_initialization_judiciously [2020/02/02 13:30] tony [Enum method] |
java:effective_java:concurrency:use_lazy_initialization_judiciously [2020/02/19 00:32] tony |
||
|---|---|---|---|
| 行 61: | 行 61: | ||
| synchronized(Singleton.class) { | synchronized(Singleton.class) { | ||
| - | if( instance != null ) { // with locking | + | result = instance; |
| - | return instance; | + | if( result != null ) { // with locking |
| + | return result; | ||
| } | } | ||
| 行 106: | 行 107: | ||
| ===== Reference ===== | ===== Reference ===== | ||
| * Java Threads, 3/e | * Java Threads, 3/e | ||
| + | * Effective Java, 3/e | ||
| * Java高併發編程詳解：多線程與架構設計, 汪文君 | * Java高併發編程詳解：多線程與架構設計, 汪文君 | ||
| * [[https://zh.wikipedia.org/wiki/%E5%8F%8C%E9%87%8D%E6%A3%80%E6%9F%A5%E9%94%81%E5%AE%9A%E6%A8%A1%E5%BC%8F|雙重檢查鎖定模式]] | * [[https://zh.wikipedia.org/wiki/%E5%8F%8C%E9%87%8D%E6%A3%80%E6%9F%A5%E9%94%81%E5%AE%9A%E6%A8%A1%E5%BC%8F|雙重檢查鎖定模式]] | ||
