複製代碼代碼如下：
導入java.util.concurrent.semaphore;
公共類三項{
公共靜態void main（string [] args）拋出InterruptedException {
信號sempa =新信號（1）;
信號sempb =新信號（0）;
信號sempc =新信號（0）;
int n = 100;
線程threada = new printThread（n，sempa，sempb，“ a”）;
thread threadB = new printThread（n，sempb，sempc，“ b”）;
thread threadC = new printThread（n，sempc，sempa，“ c”）;
threada.start（）;
threadB.start（）;
threadc.start（）;
}
靜態類PrintThread擴展了線程{
int n;
信號函數cursemp;
信號sextsemp;
字符串名稱;
public printThread（int n，信號函數cursemp，信號semaphore sempsemp，字符串名稱）{
n = n;
this.cursemp = cursemp;
this.nextSemp = nextSemp;
this.name = name;
}
public void run（）{
for（int i = 0; i <n; ++ i）{
嘗試 {
cursemp.Acquire（）;
system.out.println（name）;
NextSemp.Release（）;
} catch（InterruptedException e）{
thread.currentThread（）。interrupt（）;
}
}
}
}
}