A developer chooses to avoid using SingleThreadModel but wants to ensure that data is updated in athread-safe manner. Which two can support this design goal？（）
A: Store the data in a local variable.
B: Store the data in an instance variable.
C: Store the data in the HttpSession object.
D: Store the data in the ServletContext object.
E: Store the data in the ServletRequest object.
A: Store the data in a local variable.
B: Store the data in an instance variable.
C: Store the data in the HttpSession object.
D: Store the data in the ServletContext object.
E: Store the data in the ServletRequest object.
举一反三
- Which is used to store and process a set of values, all of the same data type, that forms a logical group? A: data structure B: array C: primitive data type D: atomic data type
- An object is an instance of a A: program B: class C: method D: data
- Which one is right about wavelet transforms? A: Wavelet transforms store large fractions of the strongest of the wavelet coefficients. B: The DWT decomposes each segment of time series via the successive use of low-pass and high-pass filtering at appropriate levels. C: Wavelet transforms can be used for reducing data and smoothing data. D: Wavelet transforms means applying to pairs of data, resulting in two set of data of the same length.
- 完成上述3题选择所需的操作，其中不包括 A: Data ⟶ Sort Cases B: Data ⟶ Restructure C: Transform ⟶ Compute Variable D: Data ⟶ Merge Files E: Data ⟶ Select Cases
- Videodisc and laser technology provide the ability to（） A: cost more B: enhance other forms of education C: create some education files D: store large amounts of data