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shijie xu's questions

Martin Hope
shijie xu
Asked: 2024-10-07 20:19:23 +0800 CST
  • 5

编写代码，发现get操作无法从具有枚举键的map中获取值。

例如，checkers初始化后，get操作总是返回 null。为什么

class Test {
    static void main(String[] args){
        Map<CHANA_OPERATION, Closure> checkers = [VIDEO_GENERATION: (userId) -> {
            System.out.println("..............")
        }, TEXT_API_CALL: (userId)->{
            return false
        }]

        checkers.get(CHANA_OPERATION.VIDEO_GENERATION).call(1)
    }


    enum CHANA_OPERATION{
        VIDEO_GENERATION(0),
        TEXT_API_CALL(1),
        TEXT_VIDEO_API_CALL(2)

        int code
        CHANA_OPERATION(int code){
            this.code = code
        }
    }

}

Exception in thread "main" java.lang.NullPointerException: Cannot invoke method call() on null object
    at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:110)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:44)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:34)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:139)
    at com.chana.application.service.impl.Test.main(Test.groovy:11)
groovy