获取泛型参数类型

 public abstract class AbstractEventHandler<T extends BaseEvent> {
   

    /**
     * 子类获取抽象父类的泛型参数类型
     *
     * @return {@code Class<T>}
     * @author fengxin 
     * @date 2020/3/30/ 
     */
    @SuppressWarnings("unchecked")
    public Class<T> getEventType() {
        Class<T> clazz = null;
        Type superType = this.getClass().getGenericSuperclass();
        ParameterizedType parameterizedType = (ParameterizedType) superType;
        Type parameterType = parameterizedType.getActualTypeArguments()[0];
        if (parameterType instanceof Class) {
            clazz = (Class<T>) parameterType;
        }
        return clazz;
    }

}

 

 

public class SampleEventHandler extends AbstractEventHandler<SampleEvent extends BaseEvent> {
       
    public static void main(String[] args) {

        SampleEventHandler sampleEventHandler = new SampleEventHandler();
           
        Class<SampleEvent> clazz = sampleEventHandler.getEventType(); 
        
    } 
}