If there's no permission, the security manager throws an exception.
如果未许可，安全性管理器抛出一个例外。
If the number is more than or equal to three, it throws an exception.
如果数目大于或等于3，它将抛出一个异常。
Remember that the method never throws an exception.
记住一点，该方法从不抛出异常。
If the counter does not exist, setting this property throws an exception.
如果计数器不存在，设定这个属性会掷回例外状况。
Method that throws the current exception.
引发当前异常的方法。
Method that throws the current exception.
引发当前异常的方法。
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