[問題]關於comparator& Map

[jojoharebell ()]

Map<String , Integer> items
    = new TreeMap<String,Integer>(new myComparator());

我自己建了個class myaComparator
準備排序TreeMap
可是在黃色的地方卻出錯了

public class myComparator implements Comparator{

        public int compare(Object o1, Object o2) {
                        Map.Entry e1 =  ( Map.Entry) o1;
--->        Map.Entry e2 =  ( Map.Entry) o2;  

            Integer d1 = (Integer) e1.getValue();
            Integer d2 = (Integer) e2.getValue();
            if(d1>=d2)
                return 1;
            else
                return -1;
        }

}


錯誤訊息如下:

Exception in thread "main" java.lang.ClassCastException: java.lang.String
cannot be cast to java.util.Map$Entry
        at myComparator.compare(myComparator.java:7)
        at java.util.TreeMap.getEntryUsingComparator(Unknown Source)
        at java.util.TreeMap.getEntry(Unknown Source)
        at java.util.TreeMap.containsKey(Unknown Source)
        at Fptree.processItems(Fptree.java:45)
        at test.main(test.java:13)

請問是哪裡有問題呢?
謝謝

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推 ClareQ:TreeMap是會用Comparator將key做排序
→ jojoharebell:謝謝 問題已解決了^^