//通过键值对来遍历
Iterator<Map.Entry<String,String>> iterator = map.entrySet().iterator();//返回所有的entry实体
while (iterator.hasNext()) {
Map.Entry<String, String> next1 = iterator.next();
String key = next1.getKey();
String value = next1.getValue();
System.out.println(key+" "+value);
}
//通过键来遍历
Iterator iterator1 = map.keySet().iterator();
while (iterator1.hasNext()) {
System.out.println(iterator1.next());
}
//通过值来遍历
Iterator iterator2 = map.values().iterator();
while (iterator2.hasNext()) {
System.out.println(iterator2.next());
}