java.util.Map翻译

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Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for this key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.)) 将指定key和指定值映射至map（可选操作）。如果map已包含该key的映射，用指定值替换旧值。 （只有当m.containsKey(k)返回true是，才可以说map m包含了key k的映射。）

Parameters:

key - key with which the specified value is to be associated. 要关联指定值的key。

value - value to be associated with the specified key. 要关联指定key的值。

Returns:

previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values. 与指定key关联的原值，如果没有此key的映射，返回null。如果实现支持null值的话， 返回null可能也表示map中指定key的原关联值为null。

Throws:

UnsupportedOperationException - if the put operation is not supported by this map. 如果当前map不支持put操作时抛出。

ClassCastException - if the class of the specified key or value prevents it from being stored in this map. 如果指定key或值的类型不允许其存入map时抛出。

IllegalArgumentException - if some ASPect of this key or value prevents it from being stored in this map. 如果指定key或值的某些方面不允许其存入map时抛出。

NullPointerException - this map does not permit null keys or values, and the specified key or value is null. 指定key或值为null，而map不允许null key或值时抛出。

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