对文本单词进行技数，并倒序列出计数统计

import java.util.Arrays;
import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;

public class Test{

    public static void main(String[] args) {
        String string = "aa  bb  cc  aa  cc  dd  ee  aa";
        String[] arr = string.split("\\s+");
     //   System.out.println(Arrays.toString(arr));
        Map<String,Integer> map = new TreeMap<String, Integer>(
                new Comparator<String>() {
                    public int compare(String o1, String o2) {
                        return o2.compareTo(o1);
                    }
        } );

        for (String str : arr) {
            if(map.containsKey(str)) {
                int count = map.get(str);
                map.put(str, count+1);
            }  else {
                map.put(str, 1);
            }
        }

        //遍历map
        for (Map.Entry<String,Integer> entry : map.entrySet()) {
            System.out.println(entry.getKey() + "  " + entry.getValue());
        }

    }

}

ee    1
dd    1
cc    2
bb    1
aa    3