2-4節(jié)，為什么我的實(shí)際輸出始終為20000
class?Req1?implements?Runnable{
???static?Req1?req1?=?new?Req1();
???static?int?i=0;
???@Override
???public?void?run()?{
??????for(int?j?=?0;j<10000;j++){
?????????i++;
??????}
???}
???public?static?void?main(String[]?args)?throws?InterruptedException?{
??????Thread?thread1?=?new?Thread(req1);
??????Thread?thread2?=?new?Thread(req1);
??????thread1.start();
??????thread2.start();
??????thread1.join();
??????thread2.join();
??????System.out.println(i);
???}
}
2019-05-14
循環(huán)次數(shù)太少了，CPU瞬間執(zhí)行完，兩個(gè)線程沒有交叉執(zhí)行，或者交叉次數(shù)太少且沒有出現(xiàn)i++被中斷執(zhí)行的情況