代码语言:java AI代码解释 publicclassMyThreadLocal{privatestaticfinalThreadLocal<Integer>threadLocal=newThreadLocal<>();publicstaticvoidset(Integervalue){threadLocal.set(value);}publicstaticIntegerget(){returnthreadLocal.get();}publicstaticvoidremove(){threadLocal.remove();}} 在上述示例中,我们创建了一...
一、volatile 可见性 publicclassVolatileThreadextendsThread{//volatile修辞的变量,变量发生变化时会强制性从主线程栈中读取该变量privatevolatilebooleanisRuning=true;publicvoidsetIsRuning(booleanisRuning){this.isRuning = isRuning; System.out.println("变量isRuning设置成功"); }publicvoidrun(){//主线程调制的...
*/privatestaticvoidseeOKByVolatile(){MyData2 myData=newMyData2();newThread(()->{System.out.println(Thread.currentThread().getName()+"\t come in");// 暂停线程,当前线程挂起,这时候main会抢占资源try{Thread.sleep(1000);}catch(InterruptedException e){e.printStackTrace();}myData.addTo60();S...
Java中的volatile关键字的作用是将一个变量标记为“存储在主存中”(being stored in main memory)。准确地说,每次都是从主存中读取volatile变量的值,而不是从CPU寄存器中,并且每次写都是将volatile变量的值写到主存中,而不仅仅是CPU寄存器中。 实际上,自从Java 5以来,volatile关键字不仅仅是保证读和写都是从内存中...
}publicvoidrun() {for(inti = 0; i < 3; i++) {//④每个线程打出3个序列值System.out.println("thread[" + Thread.currentThread().getName() + "] sn[" + sn.getNextNum() + "]"); } } } } output: thread[Thread-0] sn[1] ...
The Java programming language allows threads to access shared variables (§17.1). As a rule, to ensure that shared variables are consistently and reliably updated, a thread should ensure that it has exclusive use of such variables by obtaining a lock that, conventionally, enforces mutual exclusion...
public class VolatileDemo {//如果没有volatile,那么读取的线程可能一直读到旧值而不打印,CPU缓存模型的数据一致性导致的static volatile int flag = 0;public static void main(String[] args) {new Thread() {public void run() {int localFlag = flag;while(true) {if (localFlag != flag) {System.ou...
For the purposes of the Java programming language memory model, a single write to a non-volatile long or double value is treated as two separate writes: one to each 32-bit half. This can result in a situation where a thread sees the first 32 bits of a 64-bit value from one write,...
In Java, the volatile variables should be utilized when all changes made to a variable by one thread are immediately visible to other threads.
public class VolatileTest01 {volatile int i;public void addI(){i++;}public static void main(String[] args) throws InterruptedException {final VolatileTest01 test01 = new VolatileTest01();for (int n = 0; n < 1000; n++) {new Thread(new Runnable() {@Overridepublic void run() {try {...