// Fig. 23.4: TaskExecutor.java
// Using an ExecutorService to execute Runnables.
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;

public class TaskExecutor {
   public static void main(String[] args) {
      // create and name each runnable
      PrintTask task1 = new PrintTask("task1");
      PrintTask task2 = new PrintTask("task2");
      PrintTask task3 = new PrintTask("task3");
        
      System.out.println("Starting Executor");

      // create ExecutorService to manage threads
      ExecutorService executorService = Executors.newCachedThreadPool();

      // start the three PrintTasks
      executorService.execute(task1); // start task1	
      executorService.execute(task2); // start task2
      executorService.execute(task3); // start task3

      // shut down ExecutorService--it decides when to shut down threads
      executorService.shutdown();

      System.out.printf("Tasks started, main ends.%n%n");
   } 
} 


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