Java案例_第5页-阿里云

深入理解Java GSS（含kerberos认证及在hadoop、flink案例场景举例）

01 引言在当今的信息安全环境下，保护敏感数据和网络资源的安全至关重要。Kerberos认证协议作为一种强大的网络身份验证解决方案，被广泛应用于许多大型分布式系统中，如：Hadoop。而Java GSS（Generic Security Services）作为Java提供的通用安全服务，与Kerbe...

使用Java NIO进行文件操作、网络通信和多路复用的案例

Java NIO（New Input/Output）是Java提供的一种新的I/O操作方式，相较于传统的Java I/O API，它能够更加高效地处理大量的并发连接。本文将详细介绍Java NIO的核心组件，包括Channel、Buffer和Selector，以及其他一些辅助类和接口。一、Chann...

「大师课」搞定 Java 开发基础

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Java Spring Boot 2.6.0开发实战-1024程序员节创造营公益课

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Java Web开发-Web应用、Tomcat、HTTP请求与响应

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登录注册-----java案例

import java.util.HashMap; import java.util.Map; import java.util.Scanner; public class Login { private Map<String, String> users; public Login()...

Java案例----公交车上下车计算（设定6站）

import java.sql.SQLOutput; import java.util.Scanner; public class bus { public static void main(String[] args) { //键盘录入 Scanner scanner = new Scanner(...

java多线程使用案例

Java中的多线程是一种能够在同一应用程序中执行多个并发任务的方法。以下是几个Java多线程使用的案例：经典的“打印Hello World”例子： class MyThread extends Thread { public void run() { for (int i = 0; i < ...

18 案例：开发JAVA采集程序

需求从外部购买数据，数据提供方会实时将数据推送到6台FTP服务器上，我方部署6台接口采集机来对接采集数据，并上传到HDFS中提供商在FTP上生成数据的规则是以小时为单位建立文件夹(2016-03-11-10)，每分钟生成一个文件（00.dat,01.data,02.dat,…）提供方不提供数据备份，...

JUC第四讲：Java中的锁/CAS原理与案例分析（下）

3.10、notifyAll 是怎么实现全唤起的？nofity 是获取 WaitSet 的头结点，执行唤起操作。nofityAll 的流程，可以简单的理解为就是循环遍历 WaitSet 的所有节点，对每个节点执行 notify 操作。3.3、Volatile/Synchronized两者区别：（锁的...

JUC第四讲：Java中的锁/CAS原理与案例分析（上）

1、Java中的锁1.1、JVM 做了哪些锁优化？锁从乐观和悲观的角度可分为乐观锁和悲观锁，乐观锁乐观锁采用乐观的思想处理数据，在每次读取数据时都认为别人不会修改该数据，所以不会上锁，但在更新时会判断在此期间别人有没有更新该数据，通常采用在写时先读出当前版本号然后加锁的方法。具体过程为：比较当前版本...

【设计模式——学习笔记】23种设计模式——职责链/责任链模式(Chain of Responsibility)（原理讲解+应用场景介绍+案例介绍+Java代码实现）

案例引入学校OA系统的采购审批项目: 需求是采购员采购教学器材如果金额小于等于5000（0<x<=5000），由教学主任审批如果金额小于等于10000（5000<x<=10000），由院长审批如果金额小于等于30000（10000<x<...

【设计模式——学习笔记】23种设计模式——策略模式Strategy（原理讲解+应用场景介绍+案例介绍+Java代码实现）

案例引入有各种鸭子，比如野鸭、北京鸭、水鸭等。鸭子有各种行为，比如走路、叫、飞行等。不同鸭子的行为可能略有不同。要求显示鸭子的信息传统方案实现不同的鸭子继承一个父类Duck，如果是相同的行为就继承，不同行为就重写方法实现【鸭子抽象类】package com.atguigu.strategy; pu...

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