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  • ListOrderedMap和Map

    ListOrderedMap位于commons-collections的jar包里,与普通的map相比,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<String, String> map = new HashMap<String, String>();  
            map.put("1", "Test1");  
            map.put("2", "Test2");  
            map.put("3", "Test3");  
            map.put("4", "Test4");  
      
            Set<String> set1 = map.keySet();
            for (String key : set1) {
                System.out.println(key + ":" + map.get(key));
            }
            
            System.out.println("---------------------------------------");
      
            @SuppressWarnings("unchecked")
            Map<String, String> listOrderedMap = ListOrderedMap.decorate(new HashMap<String, String>());
            listOrderedMap.put("1", "Test1");  
            listOrderedMap.put("2", "Test2");  
            listOrderedMap.put("3", "Test3");  
            listOrderedMap.put("4", "Test4");  
      
            Set<String> set2 = listOrderedMap.keySet();
            for (String key : set2) {
                System.out.println(key + ":" + listOrderedMap.get(key));
            }

    运行结果如下:

    3:Test3
    2:Test2
    1:Test1
    4:Test4
    ---------------------------------------
    1:Test1
    2:Test2
    3:Test3
    4:Test4

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  • 原文地址:https://www.cnblogs.com/sabertobih/p/13600237.html
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