Java定时器Timer源码详解Java中的Timer类是一个用于调度任务在后台线程中执行的工具。它允许安排任务在未来的某个时间点执行一次或定期重复执行。Timer类位于java.util包中是Java标准库的一部分。Timer的基本用法Timer类提供了多种调度任务的方法包括一次性执行和周期性执行。以下是一个简单的示例import java.util.Timer; import java.util.TimerTask; public class BasicTimerExample { public static void main(String[] args) { Timer timer new Timer(); TimerTask task new TimerTask() { Override public void run() { System.out.println(Task executed at: System.currentTimeMillis()); } }; timer.schedule(task, 1000, 2000); // 延迟1秒后执行之后每隔2秒执行一次 } }Timer的核心组件Timer类的核心组件包括TimerTask和TaskQueue。TimerTask是一个抽象类表示可以被Timer调度的任务。TaskQueue是一个优先级队列用于存储待执行的任务。TimerTask的实现TimerTask实现了Runnable接口因此可以被Timer线程执行。以下是TimerTask的关键代码public abstract class TimerTask implements Runnable { final Object lock new Object(); int state VIRGIN; long nextExecutionTime; long period 0; protected TimerTask() {} public abstract void run(); public boolean cancel() { synchronized(lock) { boolean result (state SCHEDULED); state CANCELLED; return result; } } }Timer的调度逻辑Timer类 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