Map有序输出

ListOrderedMap位于commons-collections的jar包里&＃xff0c;与普通的map相比&＃xff0c;ListOrderedMap的key可保持原有顺序。

package util;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.apache.commons.collections.map.ListOrderedMap;

public class ListOrderMapTest {

public static void main(String[] args) {Map map &＃61; new HashMap(); map.put("1", "Test1"); map.put("2", "Test2"); map.put("3", "Test3"); map.put("4", "Test4"); Set set1 &＃61; map.keySet();for (String key : set1) {System.out.println(key &＃43; ":" &＃43; map.get(key));}System.out.println("---------------------------------------");&＃64;SuppressWarnings("unchecked")Map listOrderedMap &＃61; ListOrderedMap.decorate(new HashMap());listOrderedMap.put("1", "Test1"); listOrderedMap.put("2", "Test2"); listOrderedMap.put("3", "Test3"); listOrderedMap.put("4", "Test4"); Set set2 &＃61; listOrderedMap.keySet();for (String key : set2) {System.out.println(key &＃43; ":" &＃43; listOrderedMap.get(key));}


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