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面试01java中有几种方法可以实现一个线程(jdk5.0之前)？用什么关键字修饰同步方法? stop()和suspend()方法为何不推荐使用？答：有两种实现方法，分别是继承Thread类与实现Runnable接口。用synchronized关键字修饰同步方法，反对使用stop()，是因为它不...

Java 最常见的面试题：多线程锁的升级原理是什么？

在Java中，锁共有4种状态，级别从低到高依次为：无状态锁，偏向锁，轻量级锁和重量级锁状态，这几个状态会随着竞争情况逐渐升级。锁可以升级但不能降级。锁升级的图示过程：

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Java 最常见的面试题：在 java 程序中怎么保证多线程的运行安全？

线程安全在三个方面体现：原子性：提供互斥访问，同一时刻只能有一个线程对数据进行操作，（atomic,synchronized）；可见性：一个线程对主内存的修改可以及时地被其他线程看到，（synchronized,volatile）；有序性：一个线程观察其他线程中的指令执行顺序，由于指令重排序，该观察...

JAVA面试——JAVA多线程并发（四）

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JAVA面试——JAVA多线程并发（三）

4.1.14. JAVA阻塞队列原理阻塞队列，关键字是阻塞，先理解阻塞的含义，在阻塞队列中，线程阻塞有这样的两种情况:1.当队列中没有数据的情况下，消费者端的所有线程都会被自动阻塞（挂起），直到有数据放入队列。 2.当队列中填满数据的情况下，生产者端的所有线程都会被自动...

JAVA面试——JAVA多线程并发（二）

4.1.9.5. ReentrantLockReentantLock 继承接口 Lock 并实现了接口中定义的方法，他是一种可重入锁，除了能完成 synchronized 所能完成的所有工作外，还提供了诸如可响应中断锁、可轮询锁请求、定时锁等避免多线程死锁的方法。Lock 接口的主要方法1. voi...

JAVA面试——JAVA多线程并发（一）

３.1.1 JAVA 并发知识库３.1.2　JAVA 线程实现/创建方式３.1.2.1　继承 Thread 类Thread 类本质上是实现了 Runnable 接口的一个实例，代表一个线程的实例。启动线程的唯一方法就是通过 Thread 类的 start()实例方法。start()方法是一个 nat...

java面试题(十三)之多线程篇

4.11 如何实现子线程先执行，主线程再执行？参考答案启动子线程后，立即调用该线程的join()方法，则主线程必须等待子线程执行完成后再执行。扩展阅读Thread类提供了让一个线程等待另一个线程完成的方法——join()方法。当在某个程序执行流中调用其他线程的join()方法时，调用线程将被阻塞，直...

java面试题(十二)之多线程篇

4.1 创建线程有哪几种方式？参考答案创建线程有三种方式，分别是继承Thread类、实现Runnable接口、实现Callable接口。通过继承Thread类来创建并启动线程的步骤如下：定义Thread类的子类，并重写该类的run()方法，该run()方法将作为线程执行体。创建Thread子类的实例...

Java面试必问多线程简答题

1 什么是线程？什么是多线程？ 1）什么是线程：在一个进程中，每个独立的功能都需要独立的去运行，这时又需要把当前这个进程划分成多个运行区域，每个独立的小区域（小单元）称为一个线程。例如：360杀毒软件，同时既可以安全体检电脑又可以清理电脑中的垃...

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