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,在某些情况比如做报表的时候,非常实用。
代码例子如下:
public class TestListOrderedMap {
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<Entry<String, String>> entrySet1 = map.entrySet();
for (Entry<String, String> entry : entrySet1) {
System.out.println(entry.getKey() + ":" + entry.getValue());
}
Map<String, String> listOrderedMap = ListOrderedMap.decorate(new HashMap());
listOrderedMap.put("1", "Test1");
listOrderedMap.put("2", "Test2");
listOrderedMap.put("3", "Test3");
listOrderedMap.put("4", "Test4");
Set<Entry<String, String>> entrySet2 = listOrderedMap.entrySet();
for (Entry<String, String> entry : entrySet2) {
System.out.println(entry.getKey() + ":" + entry.getValue());
}
}
}
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