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比如在 plugin类中，获取群消息事件的API我该怎么做
意思是你想主动发出一个群消息事件？
Events -> 广播自定义事件
其中的 ExampleEvent 换成 net.mamoe.mirai.event.events.GroupMessageEvent，你能收集到足够的信息把它实例化就可以了
