Hello there all!
i'm working with the lab-1008 of collection framework... and doing the
homework of the TreeSet Class i get this exception
---------------Exception------------
run:
Exception in thread "main" java.lang.ClassCastException: homework.MyOwnClass
cannot be cast to java.lang.Comparable
at java.util.TreeMap.put(TreeMap.java:542)
at java.util.TreeSet.add(TreeSet.java:238)
at homework.MyTreeSet.main(MyTreeSet.java:18)
Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)
---------------------------------------
Can Anybody Help Me?
here is the code
----------------------code-------------
package homework;
import java.util.Iterator;
import java.util.TreeSet;
public class MyTreeSet {
public MyTreeSet(){}
public static void main(String[] args) {
TreeSet ts = new TreeSet();
MyOwnClass obj1 = new MyOwnClass();
MyOwnClass obj2 = new MyOwnClass();
ts.add("uno");
ts.add("dos");
ts.add(obj1);
ts.add(obj2);
ts.add(new Integer(3));
ts.add(new Integer(2));
ts.add(new Integer(1));
Iterator it = ts.iterator();
while(it.hasNext()){
System.out.println("Iterator->" + it.next());
}
}//void main
}//end of class
------------------------------------
thanks in advance
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