The transient keyword in Java is used to indicate that a particular field of a class should not be serialized. Serialization is the process of converting an object's state into a byte stream, which can then be reverted back into a copy of the object. Fields marked as transient are skipped...
例如有一个对象有三个字段field1、field2、field3,发送方不想让字段field3被序列化,因为这里面可能涉及到一些敏感信息不想被接收方知道,那有没有办法解决这个问题呢? 其实聪明的Java作者早就为我们量身定做了transient关键字! 简单来说,被transient关键字修饰过的成员属性不能被序列化,transient关键字只能修饰变量,...
In java, any two instances (even of same class) can not have same hashcode. This is a big problem because the location where keys should be placed according to new hashcodes, are not in there correct positions. When retrieving the value of a key, you will be referring to the wrong ind...
Java transient keyword is used in serialization. If you define any data member as transient, it will not be serialized. Let’s take an example, I have declared a class as Employee, it has three data members id, name, and age. If you serialize the object, all the values will be serial...
In the same way we can use the de-serilization concept to bring back the object's state from bytes. This is one of the important concept in Java programming because this serilization is mostly used in the networking programming. The object's which are needs to be transmitted through ...
transient-java 关键字 一、概要介绍 Java中的transient关键字,transient是短暂的意思。对于transient 修饰的成员变量,在类实例的序列化处理过程中会被忽略。 因此,transient变量不会贯穿对象的序列化和反序列化,生命周期仅存于调用者的内存中而不会写到磁盘里持久化。
最近阅读java集合的源码,发现transient关键字,就了解了一下他的用法,transient关键字一般在实现Serializable接口的类中出现.如下: 一、初识transient关键字 其实这个关键字的作用很好理解,一句话:将不需要序列化的属性前添加关键字transient,序列化对象的时候,这个属性就不会被序列化 ...
添加删除级联操作 ALTER TABLE 表名 ADD CONSTRAINT 外键名称 FOREIGN KEY (外键字段名称) REFERENCES 主表名称(主表列名称) ON UPDATE CASCADE ON DELETE CASCADE; 1. 2.分类 级联更新 ON UPDATE CASCADE 级联删除 ON DELETE CASCADE; 在实际的操作中,会非常谨慎使用 ...
打个比方说, 向HashMap存一个entry, key为 字符串"STRING", 在第一个java程序里, "STRING"的...
错误描述:Public Key Retrieval is not allowed. 抛出异常的位置:com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:825) 根据异常信息提示,这是MySQL 数据库连接时出现的问题。更具体地说,可能是由于连接字符串 URL 中缺少 “allowPublicKeyRetrieval=true” 参数导致的。