panbingqi2018

public class test {public static void main(String[] args) {String ppo = "";String s1 = Optional.ofNullable(ppo).filter(s->!s.isEmpty()).orElse("3344");System.out.println(s1);}

标题java8 针对于字符""和null的判断处理## 标题public class test {public static void main(String[] args) { String ppo = ""; String s1 = Optional.ofNullable(ppo).filter(s->!s.isEmpty()).orElse("3344"); System.out.println(s1);}}欢迎使用Markdown编辑器你好！

使用注解@Query，用实体类查询