//适用于需要缓存又内存有限的场景
private final Set<Request> requests = Collections.newSetFromMap(new WeakHashMap<Request, Boolean>());
//适用于需要缓存又内存有限的场景
private final Set<Request> requests = Collections.newSetFromMap(new WeakHashMap<Request, Boolean>());
本文标题:通过WeakHashMap创建WeakHashSet
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