是否应该使用迭代器原始类型？
Iterator raw type should be used or not?
我想知道这句话之间的区别：
Iterator<String> it = map.values().iterator();
还有这条语句：
Iterator it = map.values().iterator();
还有为什么分隔语句是一个好习惯：
Collection<Map.Entry<String,Customer>> entry_set = map.entrySet();
Iterator<Map.Entry<String,Customer>> entryIterator = entry_set.iterator();
It is always a good practice to define generic type for the iterator
so that you can extract the item it retrieves without casting.
This also helps in compile-time type safety of the code.
我更喜欢使用 Iterator<String> it
我想知道这句话之间的区别：
Iterator<String> it = map.values().iterator();
还有这条语句：
Iterator it = map.values().iterator();
还有为什么分隔语句是一个好习惯：
Collection<Map.Entry<String,Customer>> entry_set = map.entrySet();
Iterator<Map.Entry<String,Customer>> entryIterator = entry_set.iterator();
It is always a good practice to define generic type for the
iteratorso that you can extract the item it retrieves without casting.This also helps in compile-time type safety of the code.
我更喜欢使用 Iterator<String> it