Methods that return Numbers return 0. Methods that return booleans return false.
返回数字的方法返回0，返回布尔值的方法返回false。
It should return false if no changes are made. The example code in Listing 8 shows this logic.
如果没有进行修改，就应该返回false。
If you return false, the message is not processed further nor delivered, and will be discarded.
如果您返回false，那么消息将不被继续处理和分发，并将被丢弃。
Because Order knows nothing about OrderFulfillment, its equals method will always return false when passed an OrderFulfillment.
因为Order对OrderFulfillment一无所知，所以在传递OrderFulfillment时，其equals方法将总是返回false。
Then, submitForm() returns false so that the onclick expression of the Send button can return false, indicating the Web browser must not submit the form data to the server.
然后，submitForm()返回false，因此Send按钮的onclick表达式返回 false，指示Web浏览器不要将表单数据提交到服务器。
This is an iterative function, meaning that if you call it again, you'll get the next result in the set (and so on, until there are no results in the result set, in which case, it will return false).
这是一个迭代函数，这意味着如果您再次调用它，会得到结果集中的下一个结果(依此类推，直到结果集中没有结果，如果没有结果，则返回false)。
A simple hook of this type might check the amount of memory allocated so far, and return FALSE if that amount exceeded a small limit.
该类型的简单挂钩可以检查迄今为止分配的内存量，如果该数量超出小限制，则返回FALSE。
A simple hook of this type might check the amount of memory allocated so far, and return FALSE if that amount exceeded a small limit.
该类型的简单挂钩可以检查迄今为止分配的内存量，如果该数量超出小限制，则返回FALSE。
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