Map集合的遍历方法

• • keySet增强for
  • 迭代器
  • 直接获取value
  • entrySet

keySet增强for

Set set = map.keySet();
for (Object key : set) {
     System.out.println(key + "-" + map.get(key));
 }

迭代器

Set set = map.keySet();
Iterator iterator = set.iterator();
while (iterator.hasNext()) {
    Object key = iterator.next();
    System.out.println(key + "-" + map.get(key));
}

直接获取value

 Collection values = map.values();
 System.out.println(values);

entrySet

Set<Map.Entry> entrySet = map.entrySet();
for (Map.Entry entry : entrySet) {
    System.out.println(entry.getKey() + "-" + entry.getValue());
}