两个线程一个输出字母,一个输出数字,交替输出A1B2C3D4E5F6G7。
第一种方式:
import java.util.concurrent.CountDownLatch; public class ConcurrentTest { private static CountDownLatch latch= new CountDownLatch(1); public static void main(String[] args) { final Object o = new Object(); char[] number = "1234567".toCharArray(); char[] letter = "ABCDEFG".toCharArray(); new Thread(() -> { try { latch.await(); } catch (InterruptedException e) { e.printStackTrace(); } synchronized (o) { for (char c : number) { System.out.print(c); try { o.notify(); o.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } o.notify(); } }, "t1").start(); new Thread(() -> { synchronized (o) { for (char c : letter) { System.out.print(c); latch.countDown(); try { o.notify(); o.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } o.notify(); } }, "t2").start(); } }
第二种方式:
import java.util.concurrent.CountDownLatch; public class ConcurrentTest { private static volatile boolean task = false; public static void main(String[] args) { final Object o = new Object(); char[] number = "1234567".toCharArray(); char[] letter = "ABCDEFG".toCharArray(); new Thread(() -> { synchronized (o) { while (!task) { try { o.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } for (char c : number) { System.out.print(c); try { o.notify(); o.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } o.notify(); } }, "t1").start(); new Thread(() -> { synchronized (o) { for (char c : letter) { System.out.print(c); task = true; try { o.notify(); o.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } o.notify(); } }, "t2").start(); } }
第三种方式:
import java.util.concurrent.locks.LockSupport; public class ConcurrentTest { static Thread t1 = null, t2 = null; public static void main(String[] args) { char[] number = "1234567".toCharArray(); char[] letter = "ABCDEFG".toCharArray(); t1 = new Thread(() -> { for (char c : number) { LockSupport.park(); System.out.print(c); LockSupport.unpark(t2); } }, "t1"); t2 = new Thread(() -> { for (char c : letter) { System.out.print(c); LockSupport.unpark(t1); LockSupport.park(); } }, "t2"); t1.start(); t2.start(); } }
第四种方式:
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class ConcurrentTest {
public static void main(String[] args) {
char[] number = "1234567".toCharArray();
char[] letter = "ABCDEFG".toCharArray();
Lock lock = new ReentrantLock();
Condition condition1 = lock.newCondition();
Condition condition2 = lock.newCondition();
new Thread(() -> {
try {
lock.lock();
condition1.await();
for (char c : number) {
System.out.print(c);
condition2.signal();
condition1.await();
}
condition2.signal();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}, "t1").start();
new Thread(() -> {
try {
lock.lock();
for (char c : letter) {
System.out.print(c);
condition1.signal();
condition2.await();
}
condition1.signal();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}, "t2").start();
}
}