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AtomicInteger类：
高并发的情况下，i++无法保证原子性，往往会出现问题，所以引入AtomicInteger类。并发编程中的原子性问题
AtomicInteger类工具方法：
private static AtomicInteger atomicInteger = new AtomicInteger();// 获取当前值
public static void getCurrentValue(){}
// 设置value值
public static void setValue(){}
// 先获取旧值，然后设置新值
public static void getAndSet(){}
// 先获取旧值，然后再自增
public static void getAndIncrement(){}
// 先获取旧值，然后再自减
public static void getAndDecrement(){}
// 先获取旧值，然后再加
public static void getAndAdd(){}
// 先加1，然后获取新值
public static void incrementAndGet(){}
// 先减1，然后获取新值
public static void decrementAndGet(){}
// 先增加，然后获取值
public static void addAndGet(){}顺序打印的使用：
class Foo {private AtomicInteger firstJobDone = new AtomicInteger(0);private AtomicInteger secondJobDone = new AtomicInteger(0);public Foo() {}public void first(Runnable printFirst) throws InterruptedException {// printFirst.run() outputs "first".printFirst.run();// mark the first job as done, by increasing its count.firstJobDone.incrementAndGet();}public void second(Runnable printSecond) throws InterruptedException {while (firstJobDone.get() != 1) {// waiting for the first job to be done.}// printSecond.run() outputs "second".printSecond.run();// mark the second as done, by increasing its count.secondJobDone.incrementAndGet();}public void third(Runnable printThird) throws InterruptedException {while (secondJobDone.get() != 1) {// waiting for the second job to be done.}// printThird.run() outputs "third".printThird.run();}
}
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