Java: Using TreeSet with a Class type -

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i having problems using treeset sort hashmap. following code have:

private static hashmap<oddmove, integer> sorthashmap(         hashmap<oddmove, integer> hm) {     map<oddmove, integer> tempmap = new hashmap<oddmove, integer>();     (oddmove wsstate : hm.keyset()) {         tempmap.put(wsstate, hm.get(wsstate));     }      list<oddmove> mapkeys = new arraylist<oddmove>(tempmap.keyset());     list<integer> mapvalues = new arraylist<integer>(tempmap.values());     hashmap<oddmove, integer> sortedmap = new linkedhashmap<oddmove, integer>();     treeset<oddmove> sortedset = new treeset<oddmove>(mapkeys);     object[] sortedarray = sortedset.toarray();     int size = sortedarray.length;     (int = 0; < size; i++) {         sortedmap.put(mapkeys.get(mapvalues.indexof(sortedarray[i])),                 (integer) sortedarray[i]);     }     return sortedmap; }

following error getting:

aborting: exception in odd.ueplayer3.chosemove() java.lang.classcastexception: odd.oddmove cannot cast java.lang.comparable @ java.util.treemap.compare(treemap.java:1188) @ java.util.treemap.put(treemap.java:531) @ java.util.treeset.add(treeset.java:255) @ java.util.abstractcollection.addall(abstractcollection.java:334) @ java.util.treeset.addall(treeset.java:312) @ java.util.treeset.<init>(treeset.java:160) @ odd.ueplayer3.sorthashmap(ueplayer3.java:196) @ odd.ueplayer3.choosemove(ueplayer3.java:101) @ boardgame.client.playmove(client.java:109) @ boardgame.client.processmessage(client.java:86) @ boardgame.client.clientloop(client.java:177) @ boardgame.client.run(client.java:73) @ java.lang.thread.run(thread.java:722)

would appreciate help

i'm guessing oddmove custom class you've written. if that's case, you'll need update in order implement comparable interface.


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