使用SortedMap对HashMap排序

HashMap<String,String> map=new HashMap<String, String>();
map.put("1","11");
map.put("2", "22");
map.put("3", "33");
for (Entry<String,String> entry: map.entrySet()) {
System.out.println("排序之前:"+entry.getKey()+" 值"+entry.getValue());

}
System.out.println("======================================================");
SortedMap<String,String> sort=new TreeMap<String,String>(map);
Set<Entry<String,String>> entry1=sort.entrySet();
Iterator<Entry<String,String>> it=entry1.iterator();
while(it.hasNext())
{
Entry<String,String> entry=it.next();
System.out.println("排序之后:"+entry.getKey()+" 值"+entry.getValue());
}