Java参考和C ++参考之间的区别 [英] difference between java reference and c++ reference

问题描述

java参考和c ++参考之间有什么区别?
我在google上搜索了此内容，但未找到任何内容！

what is the difference between java reference and c++ reference?
i google this but found nothing!

推荐答案

在C ++中，引用只是对象的别名.它们只能引用初始化引用时设置的单个对象.

Java引用类似于C ++中的std::shared_ptr.它们一次只能引用一个对象，但是它们可以反弹.它们还为对象的生存期提供了一个下限-只要对该对象有一个引用，该对象就不会被垃圾回收.

总结一下:

-C ++引用在引用的生存期内绑定到同一对象，并且在控制对象的生存期中不起作用.[1]

-Java引用一次绑定到一个对象，但是在程序执行时可以将其分配给其他对象.如果存在对对象的任何引用，则不会进行垃圾回收，这与C ++中的引用不同，C ++中对对象的引用并不意味着该对象还活着.

[1]有一个例外-对临时对象的const引用只要引用还活着就可以使临时对象保持活动状态.

In C++ references are just an alias for an object. They can only ever refer to a single object which is set when the reference is initialised.

Java references are like std::shared_ptr in C++. They can only ever refer to one object at a time but they can be rebound. They also give a lower bound for the lifetime of the object - as long as there''s one reference to the object the object won''t be garbage collected.

So to sum up:

- C++ references are bound to the same object for the lifetime of the reference and don''t play any part in controlling the lifetime of the object.[1]

- Java references are bound to one object at a time but can be assigned other objects while the program executes. If any reference exists to an object it won''t be garbage collected, unlike in C++ where having a reference to an object doesn''t mean that the object''s alive.

[1] with one exception - a const reference to a temporary object keeps the temporary object alive for as long as the reference is alive.

请参考类似的讨论:
Java参考与C ++之间的区别是什么参考 [ ^ ]

Please refer similar discussion:
What''s the difference between a Java reference and C++ reference[^]

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