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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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DeliveryHouseDetails cannot be cast to java.lang.Comparable
via coderanch.com by Unknown author, 2 years ago
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)