package FDynamic.Reflect;

import java.lang.reflect.*;

import java.util.Arrays;

import java.util.List;

public class GenericDemo {

static class GenericTest<U extends Comparable<U>, V> {

U u;

V v;

List<String> list;

public U test(List<? extends Number> numbers) {

return null;

}

}

public static void main(String[] args) throws Exception {

Class<?> cls = GenericTest.class;

// 类的类型参数

for (TypeVariable t : cls.getTypeParameters()) {

System.out.println(t.getName() + " extends " + Arrays.toString(t.getBounds()));

}

// 字段 - 泛型类型

Field fu = cls.getDeclaredField("u");

System.out.println(fu.getGenericType());

// 字段 - 参数化的类型

Field flist = cls.getDeclaredField("list");

Type listType = flist.getGenericType();

if (listType instanceof ParameterizedType) {

ParameterizedType pType = (ParameterizedType) listType;

System.out.println("raw type: " + pType.getRawType() + ",type arguments:"

+ Arrays.toString(pType.getActualTypeArguments()));

}

// 方法的泛型参数

Method m = cls.getMethod("test", new Class[] { List.class });

for (Type t : m.getGenericParameterTypes()) {

System.out.println(t);

}

}

}