java.lang.ClassCastException: Employee cannot be cast to java.lang.Comparable

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Exception in thread "main" java.lang.ClassCastException: Employee cannot be cast to java.lang.Comparable
java.lang.ClassCastException: Employee cannot be cast to java.lang.Comparable
at java.util.TreeMap.put(Unknown Source)
at java.util.TreeSet.add(Unknown Source)
at undefined.Format.main(Format.java:31)

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