超类的泛型参数的实际类型

public abstract class SuperClass<T> {

    private Class<T> beanClass;

    @SuppressWarnings("unchecked")
    public SuperClass() {
        super();
        ParameterizedType parameterizedType =  (ParameterizedType) getClass().getGenericSuperclass();
        Type[] types = parameterizedType.getActualTypeArguments();
        beanClass = (Class<T>) types[0];
    }

    public Class<T> getBeanClass() {
        return beanClass;
    }

    public void setBeanClass(Class<T> beanClass) {
        this.beanClass = beanClass;
    }
    
    public static void main(String[] args) {
        SuperClass<Cat> superClass = new SubClass();
        System.out.println(superClass.getBeanClass());
    }
    
}

public class SubClass extends SuperClass<Cat> {
   
    public SubClass() {
        super();
    }
   
}

class Cat {

    public Cat() {
        super();
    }
}

运行SuperClass后控制台会打印：class com.stos.test.generic.Cat就是获取实际的泛型类