Map

Map转换为List

// key list
List keyList = new ArrayList(map.keySet());
// value list
List valueList = new ArrayList(map.valueSet());
// key-value list
List entryList = new ArrayList(map.entrySet());

Map遍历

for(Entry entry: map.entrySet()) {
  // get key
  K key = entry.getKey();
  // get value
  V value = entry.getValue();
} 

通过key对map排序