获取泛型的类型

示例一：获取父类的泛型的类型

public class Emp<T, Q> {class Stu extends Emp<String, Integer> {}@Testvoid fun() {final Type type = Emp.class.getGenericSuperclass();final ParameterizedType parameterizedType = (ParameterizedType) type;System.out.println(parameterizedType.getActualTypeArguments()[0]);System.out.println(parameterizedType.getActualTypeArguments()[1]);}
}

示例二：获取成员变量的泛型类型

public class Emp<T, Q> {private static Emp<String, Integer> emp = new Emp<>();public static void main(String[] args) throws Exception {//通过反射获取student属性Field field = Emp.class.getDeclaredField("emp");//通过属性获取泛型Type genericType = field.getGenericType();System.out.println(genericType);// ParameterizedType表示的是带泛型的类型ParameterizedType pt = (ParameterizedType) genericType;// 获取具体的泛型类型，这个方法会返回一个Type的数组Type[] actualTypeArguments = pt.getActualTypeArguments();System.out.println(actualTypeArguments[0]);System.out.println(actualTypeArguments[1]);}
}

示例三：获取局部变量的泛型的类型

public class Emp<T, Q> {public static void main(String[] args) throws Exception {//注意：泛型对象必须以匿名内部类的方式定义
Emp<String, Integer> emp = new Emp<>() { //匿名内部类};final Type type = emp.getClass().getGenericSuperclass();ParameterizedType parameterizedType = (ParameterizedType) type;final Type[] types = parameterizedType.getActualTypeArguments();System.out.println(types[0]);System.out.println(types[1]);}
}