static

来源： https://stackoverflow.com/questions/53990893/when-is-a-class-variable-initialized-in-python

来源： https://stackoverflow.com/questions/19092394/why-is-the-class-program-declared-as-static

来源： https://stackoverflow.com/questions/19092394/why-is-the-class-program-declared-as-static

来源： https://stackoverflow.com/questions/63349191/servletcontextlistener-and-static-block

问题 I was reading this answer on SO, and I was wondering why the fields are being explicitly declared as both static and const. Are const fields compile time constants in Dart? and if so doesn't that mean they are implicitly static? 回答1: You could, in theory, change Dart so that the const modifier implies static . This is a valid proposal and was actively discussed. There are two reasons why we prefer requiring the explicit static : It makes it clearer how these variables can be accessed (like

问题 I created new app with Next.js 9.3.1 . In old app with SSR. I can you getInitialProps function in HOC components (not in page), so I can fetch data from server in HOC component and from page. Like this https://gist.github.com/whoisryosuke/d034d3eaa0556e86349fb2634788a7a1 Example : export default function withLayout(ComposedComponent) { return class WithLayout extends Component { static async getInitialProps(ctx) { console.log('ctxlayout fire'); const { reduxStore, req } = ctx || {} const

问题 I created new app with Next.js 9.3.1 . In old app with SSR. I can you getInitialProps function in HOC components (not in page), so I can fetch data from server in HOC component and from page. Like this https://gist.github.com/whoisryosuke/d034d3eaa0556e86349fb2634788a7a1 Example : export default function withLayout(ComposedComponent) { return class WithLayout extends Component { static async getInitialProps(ctx) { console.log('ctxlayout fire'); const { reduxStore, req } = ctx || {} const

问题 I have different Exception category Enum as below public enum GSBBCacheCategory { SEARCH(9001), UPDATE_PERSECURITY(9002), CROSS_REFERENCING_PERSECURITY(9003), METADATA_SEARCH(9004), REMOVEALL(9005), UPDATE_BACKOFFICE(9002); private int exceptionCode; GSBBCacheCategory(int exceptionCode) { this.exceptionCode = exceptionCode; } public int getExceptionCode() { return exceptionCode; } } public enum GSBBEncryptionCategory { . . . } I want to provide one place to access these Enum in client code.

问题 I have different Exception category Enum as below public enum GSBBCacheCategory { SEARCH(9001), UPDATE_PERSECURITY(9002), CROSS_REFERENCING_PERSECURITY(9003), METADATA_SEARCH(9004), REMOVEALL(9005), UPDATE_BACKOFFICE(9002); private int exceptionCode; GSBBCacheCategory(int exceptionCode) { this.exceptionCode = exceptionCode; } public int getExceptionCode() { return exceptionCode; } } public enum GSBBEncryptionCategory { . . . } I want to provide one place to access these Enum in client code.

问题 I have build a static library with the Android ndk. I now try to use this library in another Android project //in mainActivity static { System.loadLibrary("MILlib"); } I got the following error when building the test project 02 17:07:24.890 2785-2785/com.MIL.testlib E/AndroidRuntime: FATAL EXCEPTION: main Process: com.MIL.testlib, PID: 2785 java.lang.UnsatisfiedLinkError: dlopen failed: "/data/app/com.MIL.testlib-1/lib/arm/libMILlib.so" has bad ELF magic at java.lang.Runtime.loadLibrary