java遍历map
四种方式如下，entryset,keyset,iterator,所有values。第一种方式效率高推荐使用。
for (Map<String, Object> map : reslist) {
log.info(map.toString());
//one entryset
for (Map.Entry<String, Object> entry : map.entrySet()) {
log.info("key :" + entry.getKey() + " " + "value " + entry.getValue());
}
//two keyset
for (String key : map.keySet()) {
log.info("key :" + key + " " + "value " + map.get(key));
}
//three iterator
Iterator<Map.Entry<String, Object>> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry<String, Object> entry = iterator.next();
log.info("key " + entry.getKey() + " " + "value " + entry.getValue());
}
//four only values
for (Object value : map.values()) {
log.info("value: " + value);
}
}
