1. DelayQueue 延时队列 DelayQueue 是 Java 并发包 java.util.concurrent 下的一个线程安全的阻塞队列，它存储的元素必须实现 Delayed 接口，以便计算元素的延时时间。队列中的元素只有在其指定的延迟时间到达之后才能从队列中取出。

在Java 5及之后的版本中，java.util.concurrent.ScheduledExecutorService接口为我们提供了一种优雅且强大的方式来处理定时任务。 本文将深入解析ScheduledExecutorService，并通过示例代码展示其使用方法和优势。

Learn about the best practices for concurrency in Java to ensure your multi-threaded applications are efficient, synchronized, and error-free.

Java's method resolution has strict signature binary compatibility and is looser at compile time. This was a source compatible change but, as you noted, not a binary compatible one because the return ...

What does import java.util Scanner mean? The java.util.Scanner class is one of the first components that new Java developers encounter. To use it in your code, you should import it, although another ...

The latest version is 1.9.35, and in recent versions Selenium changed the APIs that use TimeUnit parameters. Use autocomplete to find an equivalent method with a different signature.

AtomicBoolean 类位于 java.util.concurrent.atomic 包，完整类名是为 java.util.concurrent.atomic.AtomicBoolean。 本小节描述的 AtomicBoolean 是 Java 8 版本里的，而不是它第一次被引入的 Java 5 版本。