java - C++ 与 Java : endless loop creating objects only crashes C++

Question

这是我的一本书中的一个问题(没有附加答案)，我已经思考了几天了。答案仅仅是因为 C++ 代码最终会崩溃，因为它在每次迭代后都会创建一个垃圾内存单元吗？

Consider the following Java and C++ code fragments, parts of two versions of a GUI based application which collects user preferences and use them to assemble a command and its parameters. The method/function getUserCommandSpecification() returns a string representing the command code and its parameters. The returned string is used to build the required command which is then executed.

Assume the following:

(i) After the creation in the while loop of the Command object (referred by cmd in Java case or pointed by cmd in C++ case), the reference / pointer cmd to the generated object is no more referenced or used.

(ii) The application also defines a class Command along with its method/function execute().

a. Which of the two code versions, detailed below, will eventually crash.
b. Explain why a program version crashes while the other one is not crashing.

Java 代码

...
while (true) {
   String commandSpecification = getUserCommandSpecification();
   Command cmd = new Command(commandSpecification);
   cmd.execute();
}
...

C++ 代码

...
while (true) {
   string commandSpecification = getUserCommandSpecification();
   Command* cmd = new Command(commandSpecification);
   cmd -> execute();
}
...

Answer 1

是的，由于 new Command(...) 没有 delete，C++ 版本泄漏。当然，它可以很容易地进行不同的编码以避免这种情况:

...
while (true) {
   string commandSpecification = getUserCommandSpecification();
   Command cmd(commandSpecification);
   cmd.execute();
}
...

...所以我不确定这个例子是否像他们想象的那样具有启发性。