Item 48: Use caution when making streams parallel(谨慎使用并行流)
Amongmainstreamlanguages,Javahasalwaysbeenattheforefrontofprovidingfacilitiestoeasethetaskofconcurrentprogramming.WhenJavawasreleasedin1996,ithadbuilt-insupportforthreads,withsynchronizationandwait/no