Map遍历的四种方式

java遍历map 【Map遍历的四种方式】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 map : reslist) { log.info(map.toString()); //one entryset for (Map.Entry 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 iterator = map.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry entry = iterator.next(); log.info("key " + entry.getKey() + " " + "value " + entry.getValue()); } //four only values for (Object value : map.values()) { log.info("value: " + value); } }

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