????public?void?run()?{
????????//?TODO?Auto-generated?method?stub
????????while?(keepRunning)?{
????????????for?(int?i?=?0;?i?<?5;?i++)?{
????????????????System.out.println(Thread.currentThread().getName()?+?"進攻了"
????????????????????????+?i);
????????????}
//????????????Thread.yield();
????????}
????????System.out.println(Thread.currentThread().getName()?+?"進攻結束！");
????}

當我把yield放在for循環外，或者是注釋屏蔽，兩個軍隊線程依舊會是混戰，連擊，yield要不要效果都一樣