@Test void getInstance() { Assertions.assertTrue(UndoLogParserFactory.getInstance() instanceof JacksonUndoLogParser); }
public static UndoLogParser getInstance() { return SingletonHolder.INSTANCE; }
UndoLogParserFactory { public static UndoLogParser getInstance() { return SingletonHolder.INSTANCE; } }
UndoLogParserFactory { public static UndoLogParser getInstance() { return SingletonHolder.INSTANCE; }  }
UndoLogParserFactory { public static UndoLogParser getInstance() { return SingletonHolder.INSTANCE; }  static UndoLogParser getInstance(); static UndoLogParser getInstance(String name); }
UndoLogParserFactory { public static UndoLogParser getInstance() { return SingletonHolder.INSTANCE; }  static UndoLogParser getInstance(); static UndoLogParser getInstance(String name);  }