java.lang.ClassCastException: rush.Car cannot be cast to java.lang.Comparable

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java.lang.ClassCastException: rush.Car cannot be cast to java.lang.Comparable
at java.util.TreeMap.put(TreeMap.java:542)
at java.util.TreeSet.add(TreeSet.java:238)
at rush.Board.(Board.java:39)
at rush.RushFrame.main(RushFrame.java:25)

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