Comments (3)
lichriszhang
commented on July 18, 2024
5.8.2是通过ConcurrentHashMap实现的，虽然线程安全，却暴露了重复new对象的问题
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looly
commented on July 18, 2024
尝试升级到5.8.23，使用了computeIfAbsent方法应该没有重复创建问题。
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lichriszhang
commented on July 18, 2024
尝试升级到5.8.23，使用了computeIfAbsent方法应该没有重复创建问题。
我用的是jdk1.8，调用的是computeIfAbsentForJdk8，多线程情况下，因为没有加锁，map.get(key)会有多个线程返回null，mappingFunction.apply(key)还是存在多次执行的情况，所以问题仍然存在。
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