Javawait和sleep的区别

Sleep()：该方法用于将当前线程的执行暂停指定的时间(以毫秒为单位)。在这里，线程不会失去它对监视器的所有权并恢复它的执行

Wait()：这个方法在对象类中定义。它告诉调用线程(又名当前线程)等待另一个线程为此对象调用 notify() 或 notifyAll() 方法，线程等待直到它重新获得监视器的所有权和恢复执行。

Wait()	Sleep()
Wait() method belongs to Object class.	Sleep() method belongs to Thread class.
Wait() method releases lock during Synchronization.	Sleep() method does not release the lock on object during Synchronization.
Wait() should be called only from Synchronized context.	There is no need to call sleep() from Synchronized context.
Wait() is not a static method.	Sleep() is a static method.
Wait() Has Three Overloaded Methods: wait() wait(long timeout) wait(long timeout, int nanos)	Sleep() Has Two Overloaded Methods: sleep(long millis)millis: milliseconds sleep(long millis,int nanos) nanos: Nanoseconds
public final void wait(long timeout)	public static void sleep(long millis) throws Interrupted_Execption

睡眠方法示例：

synchronized(monitor)
{
Thread.sleep(1000);  Here Lock Is Held By The Current Thread
//after 1000 milliseconds, current thread will wake up, or after we call that is interrupt() method
}

示例等待方法：

synchronized(monitor)
{
monitor.wait()  Here Lock Is Released By Current Thread 
}

wait() 和 sleep() 方法的相似之处：

两者都使当前线程进入不可运行状态。
两者都是本机方法。

下面是调用wait()和sleep()方法的代码片段：

Java

synchronized(monitor){
    while(condition == true)
    {
        monitor.wait()  //releases monitor lock
    }
 
    Thread.sleep(100); //puts current thread on Sleep   
}

Java

// Java program to demonstrate the difference
// between wait and sleep
 
class GfG{
   
private static Object LOCK = new Object();
 
public static void main(String[] args)
  throws InterruptedException {
  
    Thread.sleep(1000);
   
    System.out.println("Thread '" + Thread.currentThread().getName() +
      "' is woken after sleeping for 1 second");
  
    synchronized (LOCK)
    {
        LOCK.wait(1000);
       
        System.out.println("Object '" + LOCK + "' is woken after" +
          " waiting for 1 second");
    }
}
}

Java 中等待和睡眠之间的区别

程序：

Java

// Java program to demonstrate the difference
// between wait and sleep
 
class GfG{
   
private static Object LOCK = new Object();
 
public static void main(String[] args)
  throws InterruptedException {
  
    Thread.sleep(1000);
   
    System.out.println("Thread '" + Thread.currentThread().getName() +
      "' is woken after sleeping for 1 second");
  
    synchronized (LOCK)
    {
        LOCK.wait(1000);
       
        System.out.println("Object '" + LOCK + "' is woken after" +
          " waiting for 1 second");
    }
}
}

输出

Thread 'main' is woken after sleeping for 1 second
Object 'java.lang.Object@1d81eb93' is woken after waiting for 1 second