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public static ExecutorService newFixedThreadPool(int nThreads)
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public static ExecutorService newCachedThreadPool()
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public static ExecutorService newSingleThreadExecutor()
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public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize)
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Executor executor = Executors.newFixedThreadPool(10);   
Runnable task = new Runnable() {   
    @Override  
    public void run() {   
         System.out.println("task over");   
     }   
};   
executor.execute(task);   
  
executor = Executors.newScheduledThreadPool(10);   
ScheduledExecutorService scheduler = (ScheduledExecutorService) executor;   
scheduler.scheduleAtFixedRate(task, 10, 10, TimeUnit.SECONDS);  
Executor executor = Executors.newFixedThreadPool(10);
Runnable task = new Runnable() {
@Override
public void run() {
System.out.println("task over");
}
};
executor.execute(task);
executor = Executors.newScheduledThreadPool(10);
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