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Java LinkedList类源码解析

LinkedList底层为双向链表同样继承了AbstractSequentialList<E>，跟ArrayList的数组相比读取效率低，不支持随机读取，碎片化空间利用率高，平均随机插入效率相对高。同时可以用来实现queue。属性有: transient int size = 0;lis...

Java ArrayList类源码解析

ArrayList是最常用的集合类，底层是由数组实现的首先可以看到，有两个static final对象数组，也就是被线程间共享的，EMPTY_ELEMENTDATA是非default大小的空集合，原因是要辨别第一次添加元素时应该扩展的大小。 private static final Object[...

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JAVA 8 Optional类介绍及其源码

什么是Optional对象 Java 8中所谓的Optional对象，即一个容器对象，该对象可以包含一个null或非null值。如果该值不为null，则调用isPresent()方法将返回true，且调用get()方法会返回该值。另外，该对象还有其它方法：如可以使用orElse()方法给Opti...

Java类对数据库结果集的处理（源码）

JDBC提供了很多连接数据库的方法，同时也提供了ResultSet方法对数据库结果集的可滚动查询，可更新查询。举例数据库：Mysql 声明：这两个类我都已经测试通过，如果运行出错，请仔细检查，源码方法一定没问题。问题可能会出在表数据的属性，和JDBC版本是否支持。 &n...

Java事务处理类（源码）

Mysql5很好的支持了事物处理功能。不过支持这个功能的只有两种表类型。分别是BDB，InnoDB。先建立一个表，名为Kiss，数据为id （int），name（varchar），pop（varchar）。下面是源码： import&nb...

Java数据库连接池类源码

环境：MyEclipse 数据库：mysql 首先新建Java项目，然后新建两个类，一个数据库连接池类，一个测试类。分别命名ConnectionPool，ConnectionPoolTest。然后新建一个配置文件，命名：dbpool.pro...

分析Java的类加载器与ClassLoader（二）：classpath与查找类字节码的顺序，分析ExtClassLoader与AppClassLoader的源码

先回顾一下classpath classpath的作用： classpath的作用是指定查找类的路径：当使用java命令执行一个类（类中的main方法）时，会从classpath中进行查找这个类。指定classpath的方式一：&n...

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