用两个线程，一个输出字母，一个输出数字，交替输出1A2B3C4D...26Z

方法一

public class Test {

static Thread t1 = null, t2 = null;

public static void main(String[] args) {

char[] aI = "1234567".toCharArray();

char[] aC = "ABCDEFG".toCharArray();

t1 = new Thread(new Runnable() {

@Override

public void run() {

for (char c : aI) {

System.out.print(c);

LockSupport.unpark(t2);

LockSupport.park();

}

}

});

t2 = new Thread(new Runnable() {

@Override

public void run() {

for (char c : aC) {

LockSupport.park();

System.out.print(c);

LockSupport.unpark(t1);

}

}

});

t1.start();

t2.start();

}

}

方法二

public class Test2 {

static Thread t1 = null, t2 = null;

enum ReadyToRun {T1, T2}

static ReadyToRun r = T1;

public static void main(String[] args) {

char[] aI = "1234567".toCharArray();

char[] aC = "ABCDEFG".toCharArray();

t1 = new Thread(new Runnable() {

@Override

public void run() {

for (char c : aI) {

while (r != T1) {

}

System.out.print(c);

r = T2;

}

}

});

t2 = new Thread(new Runnable() {

@Override

public void run() {

for (char c : aC) {

while (r != T2) {

}

System.out.print(c);

r = T1;

}

}

});

t1.start();

t2.start();

}

}

方法三

public class Test3 {

static Thread t1 = null, t2 = null;

static AtomicInteger a = new AtomicInteger(1);

public static void main(String[] args) {

char[] aI = "1234567".toCharArray();

char[] aC = "ABCDEFG".toCharArray();

t1 = new Thread(new Runnable() {

@Override

public void run() {

for (char c : aI) {

while (a.get() != 1) {

}

System.out.print(c);

a.set(2);

}

}

});

t2 = new Thread(new Runnable() {

@Override

public void run() {

for (char c : aC) {

while (a.get() != 2) {

}

System.out.print(c);

a.set(1);

}

}

});

t1.start();

t2.start();

}

}

方法四

public class Test4 {

//队列阻塞特性

static Thread t1 = null, t2 = null;

static BlockingQueue bq1 = new ArrayBlockingQueue<>(1);

static BlockingQueue bq2 = new ArrayBlockingQueue<>(1);

public static void main(String[] args) {

char[] aI = "1234567".toCharArray();

char[] aC = "ABCDEFG".toCharArray();

t1 = new Thread(new Runnable() {

@Override

public void run() {

for (char c : aI) {

System.out.print(c);

try {

bq1.put("ok");

bq2.take();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

});

t2 = new Thread(new Runnable() {

@Override

public void run() {

for (char c : aC) {

try {

bq1.take();

System.out.print(c);

bq2.put("ok");

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

});

t2.start();

t1.start();

}

}

方法五

public class Test5 {

static Thread t1 = null, t2 = null;

static CountDownLatch latch = new CountDownLatch(1);

public static void main(String[] args) {

char[] aI = "1234567".toCharArray();

char[] aC = "ABCDEFG".toCharArray();

final Object o = new Object();

t1 = new Thread(new Runnable() {

@Override

public void run() {

synchronized (o) {

for (char c : aI) {

System.out.print(c);

latch.countDown();

try {

o.notify();

o.wait();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

o.notify();

}

}

});

t2 = new Thread(new Runnable() {

@Override

public void run() {

try {

latch.await();

} catch (InterruptedException e) {

e.printStackTrace();

}

synchronized (o) {

for (char c : aC) {

System.out.print(c);

try {

o.notify();

o.wait();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

o.notify();

}

}

});

t1.start();

t2.start();

}

}

方法六

public class Test6 {

static Thread t1 = null, t2 = null;

public static void main(String[] args) {

char[] aI = "1234567".toCharArray();

char[] aC = "ABCDEFG".toCharArray();

Lock lock = new ReentrantLock();

//一把锁两种条件

Condition conditionT1 = lock.newCondition();

Condition conditionT2 = lock.newCondition();

CountDownLatch latch = new CountDownLatch(1);

t1 = new Thread(new Runnable() {

@Override

public void run() {

try {

lock.lock();

for (char c : aI) {

System.out.print(c);

latch.countDown();

conditionT2.signal();

conditionT1.await();

}

conditionT2.signal();

} catch (InterruptedException e) {

e.printStackTrace();

} finally {

lock.unlock();

}

}

});

t2 = new Thread(new Runnable() {

@Override

public void run() {

try {

latch.await();

lock.lock();

for (char c : aC) {

System.out.print(c);

conditionT1.signal();

conditionT2.await();

}

conditionT1.signal();

} catch (Exception e) {

e.printStackTrace();

} finally {

lock.unlock();

}

}

});

t1.start();

t2.start();

}

}