不可变属性的存取器将总是具有值引用，因而调用的任何一方都不需要防御性复制，这使得它们效率更高。
Accessors for immutable properties will always have value semantics and do not need the defensive copying on either side of the call, making them more efficient.
您应该始终使用集合而不是数组来创建不可变列表，尽管防御性的数组复制也是可行的，但这会带来一些不希望见到的副作用。
You should always use collections to create immutable lists rather than arrays. Although it is possible to copy arrays defensively, it leads to some undesirable side-effects.
您应该始终使用集合而不是数组来创建不可变列表，尽管防御性的数组复制也是可行的，但这会带来一些不希望见到的副作用。
You should always use collections to create immutable lists rather than arrays. Although it is possible to copy arrays defensively, it leads to some undesirable side-effects.
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