java線程系列—condition例子

例如：有三個線程 ，當1執行完後，指定2執行，2執行完後指定3執行，3執行完後指定1執行

public class ThreeConditionCommunication {

public static void main(String[] args) {

final Business business = new Business();
new Thread(
new Runnable() {

@Override
public void run() {

for(int i=1;i<=50;i++){
business.sub2(i);
}

}
}
).start();

new Thread(
new Runnable() {

@Override
public void run() {

for(int i=1;i<=50;i++){
business.sub3(i);
}

}
}
).start();


for(int i=1;i<=50;i++){
business.main(i);
}

}

static class Business {
Lock lock = new ReentrantLock();
Condition condition1 = lock.newCondition();
Condition condition2 = lock.newCondition();
Condition condition3 = lock.newCondition();
 private int shouldSub = 1;
 public  void sub2(int i){
 lock.lock();
 try{
 while(shouldSub != 2){
 try {
condition2.await();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
 }
for(int j=1;j<=10;j++){
System.out.println("sub2 thread sequence of " + j + ",loop of " + i);
}
 shouldSub = 3;
 condition3.signal();
 }finally{
 lock.unlock();
 }
 }

 public  void sub3(int i){
 lock.lock();
 try{
 while(shouldSub != 3){
 try {
condition3.await();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
 }
for(int j=1;j<=20;j++){
System.out.println("sub3 thread sequence of " + j + ",loop of " + i);
}
 shouldSub = 1;
 condition1.signal();
 }finally{
 lock.unlock();
 }
 }  
 
 public  void main(int i){
 lock.lock();
 try{
while(shouldSub != 1){
  try {
condition1.await();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
  }
for(int j=1;j<=100;j++){
System.out.println("main thread sequence of " + j + ",loop of " + i);
}
shouldSub = 2;
condition2.signal();
 }finally{
 lock.unlock();
 }
 }

}
}