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🌱不定期收集整理Java相关面试题
怎么好的东西 必须star一波
readme jvm面试题的链接会跳转到排序算法上去。
你的:
JVM调度的模式有两种:分时调度和抢占式调度。 分时调度是所有线程轮流获得CPU使用权,并平均分配每个线程占用CPU的时间; 抢占式调度是根据线程的优先级别来获取CPU的使用权。 JVM的线程调度模式采用了抢占式模式。既然是抢占调度,那么我们就能通过设置优先级来“有限”的控制线程的运行顺序,注意“有限”一次。
深入理解java虚拟机里写道:jvm调度方式包括协同式和抢占式,你的分时调度,不就是抢占式的实现方法吗?
public class Singleton {
/**
* 注意此处使用的关键字 volatile,
* 被volatile修饰的变量的值,将不会被本地线程缓存,
* 所有对该变量的读写都是直接操作共享内存,从而确保多个线程能正确的处理该变量。
*/
private volatile static Singleton singleton;
private Singleton() {
}
public static Singleton getInstance() {
if (instance == null) {
synchronized(Singleton.class) {
if (instance == null) {
instance = new Singleton();
}
}
}
return singleton;
}
}
instance 在哪初始化的?然后返回了singleton?
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