分类：并发环境

2020
10-10

Java HashMap源码及并发环境常见问题解决

HashMap源码简单分析：1一切需要从HashMap属性字段说起：/**Thedefaultinitialcapacity-MUSTbeapoweroftwo.初始容量*/staticfinalintDEFAULT_INITIAL_CAPACITY=1<<4;//aka16/***Themaximumcapacity,usedifahighervalueisimplicitlyspecified*byeitheroftheconstructorswitharguments.*MUSTbeapoweroftwo<=1<<30.最大容量*/staticfinalintMAXIMUM_CAPACIT... 继续阅读 >

2020
10-08

Java在并发环境中SimpleDateFormat多种解决方案

先来看一个多线程下使用例子，看到运行结果会出现异常：importjava.text.DateFormat;importjava.text.SimpleDateFormat;importjava.util.Date;importjava.util.Random;importjava.util.concurrent.ExecutorService;importjava.util.concurrent.Executors;publicclassSimpleDateFormateTest{publicstaticvoidmain(String[]args){finalDateFormatdf=newSimpleDateFormat("yyyyMMdd,HHmmss");Executor... 继续阅读 >