import java.util.Comparator; import java.util.Iterator; import java.util.Map; import java.util.Set; import java.util.TreeMap; public class TreeMapTest { public static void main(String[] args) { Map<String, String> map = new TreeMap<String, String>( new Comparator<String>() { public int compare(String obj1, String obj2) { // sort descending return obj2.compareTo(obj1); } }); map.put("b", "ccccc"); map.put("d", "aaaaa"); map.put("c", "bbbbb"); map.put("a", "ddddd"); Set<String> keySet = map.keySet(); Iterator<String> iter = keySet.iterator(); while (iter.hasNext()) { String key = iter.next(); System.out.println(key + ":" + map.get(key)); } } }
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