Java类源码的相关内容

Java FileReader InputStreamReader类源码解析

FileReader 前面介绍FileInputStream的时候提到过，它是从文件读取字节，如果要从文件读取字符的话可以使用FileReader。FileReader是可以便利读取字符文件的类，构造器只能使用默认的字符集编码（系统的默认字符集）、默认的bytebuffer大小8KB。如果想要自己指...

Java FileInputStream FileOutputStream类源码解析

FileInputStream和FileOutputStream是匹配的文件输出输出流，读取和写入的是byte，所以适合用来处理一些非字符的数据，比如图片数据。因为涉及到大量关于文件的操作，所以存在很多的native方法和利用操作系统的文件系统实现，所以要深入了解文件输入输出流还是需要加强操作系统和...

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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 ByteArrayInputStream ByteArrayOutputStream类源码解析

ByteArrayOutputStream ByteArrayOutputStream继承了抽象类OutputStream，本质是一个存在于堆内存中的可扩展byte数组，因为所有操作都在内存中所以flush()也什么都没做。该类实现了一个输出流，数据写入一个byte数组，缓冲区随着写入的数据自动增...

Java StringBuffer StringBuilder类源码解析

StringBuffer StringBuffer是线程安全的字符动态序列，像String但是可以修改，在任何时点他都含有字符的特定序列，但是序列的长度和内容可以通过调用某些方法来修改。 StringBuffer对于多线程是安全的，在必要的方法上都加了synchronized。核心方法是append...

Java HashSet LinkedHashSet TreeSet类源码解析

Set集合中不含有重复的元素，插入重复的元素会失败。常用的有HashSet LinkedHashSet TreeSet。HashSet是无序的集合，LinkedHashSet中的排序和插入成功的顺序一致重复插入，TreeSet中元素是有序排列的，排序的依据是自身的comparator如果为null则...

Java TreeMap类源码解析

TreeMap实现的是基于红黑树的有序键值对集合，底层完全是树状链表不含有数组，key不能为null，value可以为null。本身含有comparator，若comparator不为null则所有关于key的比较都是通过comparator完成，否则直接根据key本身的class实现来比较，若此时...

Java LinkedHashMap类源码解析

LinkedHashMap继承了HashMap，他在HashMap的基础上增加了一个双向链表的结构，链表默认维持key插入的顺序，重复的key值插入不会改变顺序，适用于使用者需要返回一个顺序相同的map对象的情况。还可以生成access-order顺序的版本，按照最近访问顺序来存储，刚被访问的结点处...

Java Hashtable类源码解析

老生常谈的问题——Hashtable和HashMap有什么区别大家一般都能说出几条，比如Hashtable是线程安全的，不支持null作为key和value值等等。那么，要仔细了解这个问题还是直接从Hashtable的源码入手。先列一下我找到的区别：继承类不同，Hashtable继承的是Dic...

Java HashMap类源码解析(续)-TreeNode

　　由于TreeNode本身是红黑树的实现，所以在分析TreeNode的之前我还是摸了一篇算法导论里红黑树的读书笔记：算法导论——红黑树，从伪代码行数也可以看出完整的红黑树的插入和删除操作代码是很长的，下面源码分析部分的行数就更多了，所以所谓手写红黑树画个图分析下逻辑还行，手写代码估计要写死(滑稽)...

Java HashMap类源码解析

　　作为重要的常用集合，HashMap主要是提供键值对的存取，通过key值可以快速找到对应的value值。Hash表是通过提前设定好的规则计算一个元素的hash值来找到他在数组中的存储位置进行快速定位，假设有一个大小为10的数组，可以设定简单的计算规则为元素转为int后mod 10，由此元素的has...

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