同一个美丽而聪慧的人相处,能使人紧张的神经放松,感情变得柔和——巴尔扎尔
引入依赖:
代码语言:javascript复制<!-- https://search.maven.org/artifact/io.github.vampireachao/stream-query -->
<dependency>
<groupId>io.github.vampireachao</groupId>
<artifactId>stream-core</artifactId>
<version>1.1.12</version>
</dependency>
编写代码:
代码语言:javascript复制@Test
void test() {
class User {
public GenderEnum getGender() {
return null;
}
}
String exceptionMessage = null;
User user = new User();
try {
require(user::getGender);
} catch (IllegalArgumentException e) {
exceptionMessage = e.getMessage();
}
Assertions.assertEquals("'gender'需要'MALE|FEMALE'其一", exceptionMessage);
}
@SuppressWarnings("unchecked")
public static <T extends Enum<T>> void require(SerSupp<T> enumSupp) {
LambdaExecutable executable = LambdaHelper.resolve(enumSupp);
Enum<T>[] enumConstants = ((Class<Enum<T>>) executable.getReturnType()).getEnumConstants();
Sf.of(enumSupp.get()).require(() -> new IllegalArgumentException(
"'" BeanHelper.getPropertyName(executable.getName())
"'需要'" Steam.of(enumConstants).map(Enum::name).join("|") "'其一"));
}
当你使用require(user::getGender)
时,如果gender
为null
,则会抛出异常,并提示:'gender'需要'MALE|FEMALE'其一
这里获取了getGender
的lambda
方法名称,以及返回值枚举类型,通过遍历枚举的name
列举选项,拼接为字符串