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| public class PrintTest {
static volatile int count = 1;
public static void printZero() {
System.out.print("0");
}
public static void printOdd() {
System.out.print(count);
}
public static void printEven() {
System.out.print(count);
}
public static void print(int n) throws InterruptedException {
ReentrantLock lock = new ReentrantLock();
Condition zeroCond = lock.newCondition();
Condition oddCond = lock.newCondition();
Condition evenCond = lock.newCondition();
Thread zero = new Thread(() -> {
lock.lock();
while (count <= n) {
zeroCond.await();
if (count <= n) {
printZero();
}
if (count % 2 == 1) {
evenCond.signal();
} else {
oddCond.signal();
}
}
lock.unlock();
});
Thread odd = new Thread(() -> {
lock.lock();
while (count <= n) {
oddCond.await();
if (count > n) {
return;
}
printEven();
count++;
zeroCond.signal();
}
lock.unlock();
});
Thread even = new Thread(() -> {
lock.lock();
while (count <= n) {
evenCond.await();
if (count > n) {
return;
}
printOdd();
count++;
zeroCond.signal();
}
lock.unlock();
});
zero.start();
odd.start();
even.start();
lock.lock();
zeroCond.signal();
lock.unlock();
zero.join();
odd.join();
even.join();
}
}
|