java.lang.ClassCastException: Practice.Obj cannot be cast to java.lang.Comparable

Coderanch | Lio Liov | 5 years ago
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    Coderanch | 5 years ago | Lio Liov
    java.lang.ClassCastException: Practice.Obj cannot be cast to java.lang.Comparable
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    Root Cause Analysis

    1. java.lang.ClassCastException

      Practice.Obj cannot be cast to java.lang.Comparable

      at java.util.PriorityQueue.siftUpComparable()
    2. Java RT
      PriorityQueue.add
      1. java.util.PriorityQueue.siftUpComparable(Unknown Source)
      2. java.util.PriorityQueue.siftUp(Unknown Source)
      3. java.util.PriorityQueue.offer(Unknown Source)
      4. java.util.PriorityQueue.add(Unknown Source)
      4 frames
    3. Practice
      QueueExample.main
      1. Practice.QueueExample.main(QueueExample.java:10)
      1 frame