问题描述

使⽤两个线程交替打印序列，⼀个线程打印数字， 另外⼀个线程打印字⺟， 最终效果 如下：

12AB34CD56EF78GH910IJ1112KL1314MN1516OP1718QR1920ST2122UV2324WX2526YZ2728

通过线程通信，通知2个线程依次打印2个自己的内容即可，打印后通知另1个线程打印

golang 方案

package programimport (    "sync"    "testing")func Test_1(t *testing.T) {    char := make(chan bool)    number := make(chan bool)    wg := sync.WaitGroup{}    wg.Add(1)    go func() {        i := 1        for {            select {            case <-number:                print(i)                i++                print(i)                i++                char <- true            }        }    }()    go func() {        i := 'A'        for {            select {            case <-char:                if i > 'Z' {                    wg.Done()                    return                }                print(string(i))                i++                print(string(i))                i++                number <- true            }        }    }()    number <- true    wg.Wait()}

public class Test1 {    public static void main(String[] args) throws InterruptedException {        Lock lock = new ReentrantLock();        Condition number = lock.newCondition();        Condition chars = lock.newCondition();        CountDownLatch countDownLatch = new CountDownLatch(1);        Runnable numberPrinter = () -> {            int i = 1;            while (true) {                lock.lock();                System.out.print(i);                i++;                System.out.print(i);                i++;                chars.signal();                try {                    number.await();                } catch (InterruptedException e) {                    System.out.println("Interrupt");                } finally {                    lock.unlock();                }            }        };        Runnable charPrinter = new Runnable() {            int i = 'A';            @Override            public void run() {                while (true) {                    lock.lock();                    if (i > (int) 'Z') {                        countDownLatch.countDown();                        return;                    }                    System.out.print((char) i);                    i++;                    System.out.print((char) i);                    i++;                    number.signal();                    try {                        chars.await();                    } catch (InterruptedException e) {                        throw new RuntimeException(e);                    } finally {                        lock.unlock();                    }                }            }        };        Thread t1 = new Thread(charPrinter);        Thread t2 = new Thread(numberPrinter);        t1.start();        t2.start();        countDownLatch.await();        System.exit(1);    }}

import threadinglock = threading.Lock()number_condition = threading.Condition(lock)char_condition = threading.Condition(lock)def number_print():    i = 1    while True:        lock.acquire()        print(i, end='')        i += 1        print(i, end='')        i += 1        char_condition.notify()        number_condition.wait()        lock.release()def char_print():    i = ord('A')    while True:        if i > ord('Z'):            return        lock.acquire()        print(chr(i), end='')        i += 1        print(chr(i), end='')        i += 1        number_condition.notify()        char_condition.wait()        lock.release()threading.Thread(target=number_print).start()threading.Thread(target=char_print).start()