SortedMap集合

public static void main(String[] args) {

// TODO (6)SortedMap集合:按照key自动排序

SortedMap<String, String> map = new TreeMap<String, String>();

map.put("c", "张三");

map.put("b", "李四");

map.put("a", "王五");

Set<String> set = map.keySet();

for (String key:set) {

System.out.println(key + "\t" + map.get(key));

}

}