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via Oracle Community by Joshua, 1 year ago
Tree cannot be cast to java.lang.Comparable
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java.lang.StringBuffer cannot be cast to java.lang.Comparable
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corejava.compare.Employee cannot be cast to java.lang.Comparable
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java.lang.ClassCastException: Tree cannot be cast to java.lang.Comparable	at java.util.TreeMap.put(TreeMap.java:542)	at java.util.TreeSet.add(TreeSet.java:238)	at Tree.main(Tree.java:13)