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      2. 为什么存在WeakHashMap,却没有WeakSet?

        时间:2023-07-12

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                  本文介绍了为什么存在WeakHashMap,却没有WeakSet?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  来自 J.布洛赫

                  ... 内存泄漏的来源是听众... 最好的方法来确保回调被垃圾收集及时是只存储弱对它们的引用,例如,通过仅将它们作为键存储在WeakHashMap.

                  A ... source of memory leaks is listeners ... The best way to ensure that callbacks are garbage collected promptly is to store only weak references to them, for instance, by storing them only as keys in a WeakHashMap.

                  那么,为什么 Java Collections 框架中没有 WeakSet?

                  So, why there isn't any WeakSet in the Java Collections framework?

                  推荐答案

                  Collections.newSetFromMap

                  Set<Object> weakHashSet = 
                      Collections.newSetFromMap(
                          new WeakHashMap<Object, Boolean>()
                      );
                  

                  Collections.newSetFromMap 文档,传递一个 WeakHashMap 获取 Set.

                  这篇关于为什么存在WeakHashMap,却没有WeakSet?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

                  上一篇:是否有针对 GC 问题的食谱指南? 下一篇:运行 JVM 的 GC 参数是什么?

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