public class Thread06 {
public static void main(String[] args) {
Data06 data = new Data06();
new Thread(()-> {
while (true) {
data.printA();
}
}, "A").start();
new Thread(()-> {
while (true) {
data.printB();
}
}, "B").start();
new Thread(()-> {
while (true) {
data.printC();
}
}, "C").start();
}
}
class Data06 {
Lock lock = new ReentrantLock();
Condition condition1 = lock.newCondition();
Condition condition2 = lock.newCondition();
Condition condition3 = lock.newCondition();
int number = 1; // 1A 2B 3C
public void printA() {
lock.lock();
try {
while (number != 1) {
condition1.await();
}
System.out.println(Thread.currentThread().getName() + "=>AAA");
number = 2;
condition2.signal();
} catch (Exception e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
public void printB() {
lock.lock();
try {
while (number != 2) {
condition2.await();
}
System.out.println(Thread.currentThread().getName() + "=>BBB");
number = 3;
condition3.signal();
} catch (Exception e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
public void printC() {
lock.lock();
try {
while (number != 3) {
condition3.await();
}
System.out.println(Thread.currentThread().getName() + "=>CCC");
number = 1;
condition1.signal();
} catch (Exception e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
}