可以用原子方式更新的 int 值。有关原子变量属性的描述，请参阅 java.util.concurrent.atomic 包规范。AtomicInteger 可用在应用程序中（如以原子方式增加的计数器），并且不能用于替换 Integer。但是，此类确实扩展了 Number，允许那些处理基于数字类的工具和实用工具进行统一访问。
AtomicInteger 是线程安全的，多线程对同一个数加100次，结果一定是100. 相关代码示例：
import java.util.concurrent.CountDownLatch; import java.util.concurrent.atomic.AtomicInteger; import javax.annotation.PostConstruct; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; import org.springframework.stereotype.Component; /** * @ClassName: AtomicIntegerHandle * @Description: AtomicInteger的使用 * @author wasim * @create at 2015-8-12 下午8:44:51 * */ @Component public class AtomicIntegerHandle { @Autowired ThreadPoolTaskExecutor executor; @PostConstruct public void handleQuestionKnowledge(){ AtomicInteger atomicInteger = new AtomicInteger(); int round = 15; //要执行的线程总数 //导出文件 executor.execute(new ExportStats(atomicInteger, round)); //导出文件前，需要先循环下面12个线程 for(int i=0;i<round;i++){ executor.execute(new similarKnowledgeHandle(atomicInteger)); } } public class similarKnowledgeHandle implements Runnable{ AtomicInteger atomicInteger; public similarKnowledgeHandle(AtomicInteger atomicInteger) { this.atomicInteger =atomicInteger; } @Override public void run() { System.out.println("do some thing...."); atomicInteger.getAndIncrement(); System.out.println(atomicInteger.get()); //显示当前计数 } } public class ExportStats implements Runnable{ AtomicInteger atomicInteger; int round; public ExportStats(AtomicInteger atomicInteger, int round) { this.atomicInteger =atomicInteger; this.round = round; } @Override public void run() { try { boolean flag = true; while(flag){ if(atomicInteger.get() == round){ flag = false; System.out.println("预处理完成,开始执行相关..."); } else { System.out.println("wait..."); Thread.sleep(1000); } } } catch (Exception e) { e.printStackTrace(); } } } }转载于:https://www.cnblogs.com/wangxin37/p/6397164.html
