摘要: null对象调用属性 e.g public class Student { Integer age; String name; String address ; User user;} Student student= new Student(); 12:student.getUser().getN 阅读全文
posted @ 2023-09-08 23:34 mljqqh 阅读(22) 评论(0) 推荐(0)
摘要: package study; import lombok.Data; @Data public class Student { Integer age; String name; String address ; public Student() { } public Student(Builder 阅读全文
posted @ 2023-09-08 23:30 mljqqh 阅读(18) 评论(0) 推荐(0)
摘要: 编译时异常(编译时异常主要由编译器抛出。) ,非编译异常(运行时主要由异常jvm抛出) 阅读全文
posted @ 2023-09-08 10:39 mljqqh 阅读(11) 评论(0) 推荐(0)