ThreadPoolExecutor的PriorityBlockingQueue支持问题
最近在使用ThreadPoolExecutor时遇到一个问题：当ThreadPoolExecutor使用的BlockingQueue为PriorityBlockingQueue时，会出现异常，原因是java.util.concurrent.FutureTask cannot be cast to java.lang.Comparable。Google之，发现有很多同样的问题，但没有给出解决方案，只能查看源代码以期能找到并解决问题。 首先根据Exception找到问题原因： Exception in thread "main" java.lang.ClassCastException: java.util.concurrent.FutureTask cannot be cast to java.lang.Comparable at java.util.concurrent.PriorityBlockingQueue.siftUpComparable(PriorityBlockingQueue.java:347) at java.util.concurrent.PriorityBlockingQueue.offer(PriorityBlockingQueue.java:475) at java.util.concurrent.ThreadPoolExecutor.execute