Java案例_第35页-阿里云

基于Java多线程操作文件案例分享

场景描述：某文件夹下有很多文件和文件夹，要求读取出该文件夹下的所有文件，并将文本打印输出。案例分析：假设该文件夹下有10个文件，那么我们将所有的文件遍历一遍打印输出就可以了。但如果有100个, 1000个，10000个，甚至更多呢？这时候或许我们应该考虑使用...

通过top命令和thread dump查看JAVA线程死循环的案例

这篇文章是由一个面试的问题引出的。面试官问曰：“尔可知如何定位JAVA程序的死循环？”。思虑良久，未有良策，回来查阅了下资料，经过一番曲折感觉自己解决问题的能力又提高了不少。以下是个例子，不一定很合适但足以说明一些问题。 1、查看进程ID： [resin_access@172 ~]$ jps 323...

「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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java泛型好处及案例

Java 泛型是java SE 1.5的新特性，泛型的本质是参数化类型，也就是说所操作的数据类型被指定为一个参数。这种参数类型可以用在类、接口和方法的创建中，分别称为泛型类、泛型...

Java中的Swing键盘绑定案例

package ch12; import javax.swing.*; import java.awt.*; import java.awt.event.*; /** * Created by Jiqing on 2016/12/9. */ public class BindKeyTest { JF...

jvm系列(六):Java服务GC参数调优案例

本文介绍了一次生产环境的JVM GC相关参数的调优过程，通过参数的调整避免了GC卡顿对JAVA服务成功率的影响。这段时间在整理jvm系列的文章，无意中发现本文，作者思路清晰通过步步分析最终解决问题。我个人特别喜欢这种实战类的内容，经原作者的授权同意，将文章分享于此。备注部分为本人添加，主要起到说明...

Java中HashMap案例

package ch8; import java.util.*; /** * Created by Jiqing on 2016/11/27. */ public class MapTest { public static void main(String[] args) { // Map不同于Li...

持续集成案例学习：Docker、Java与Maven

本文讲的是持续集成案例学习：Docker、Java与Maven，【编者的话】对于使用Java技术栈的企业，Maven往往是其持续集成的核心工具，在当前的Docker化的运动中，要如何把Docker镜像的构建也加入到传统的Maven构建为基础的持续集成流程中呢？Alooma公司在本文中分享了他们使用M...

Java面向对象抽象类案例分析

1 /** 2 雇员示例： 3 需求：公司中程序员有姓名，工号，薪水，工作内容 4 项目经理除了有姓名，工号，薪水还有奖金，工作内容 5 对给出需求进行数据建模 6 7 8 分析： 9 在这个问题领域中，先找出涉及的对象 10 通过名词提炼法 11 程序员： 12 属性：姓名，工号，薪水 13 行为...

遗传算法的基本概念和实现（附 Java 实现案例）

如上图（左）所示，遗传算法当个体由多条染色体组成，每条染色体由多个基因组成。上图（右）展示了染色体分割和组合方式。自然选择的概念自然选择的过程从选择群体中最适应环境的个体开始。后代继承了父母的特性，并且这些特性将添加到下一代中。如果父母具有更好的适应性，那么它们的后代将更易于存活。迭代地进行该自...

JVM（Java虚拟机）优化大全和案例实战

　堆内存设置　　原理　　JVM堆内存分为2块：Permanent Space 和 Heap Space。　　Permanent 即持久代（Permanent Generation），主要存放的是Java类定义信息，与垃圾收集器要收集的Java对象关系不大。　　Heap = { Old + NEW ...

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