Creating threadpool to execute tasks


The below code shows  usage of  util.concourrent.ExecutorService to create a thread pool.
The tasks are executed concurrently using the avilable number of fixed threads.
Below link tells us the difference of thread vs runnable interface


3) Runnable interface represent a Task which can be executed by either plain Thread or Executors or any other means. so logical separation of Task as Runnable than Thread is good design decision.
 



 package com.anjana.threadpools;  
 import java.util.ArrayList;  
 import java.util.List;  
 import java.util.concurrent.ExecutorService;  
 import java.util.concurrent.Executors;  
 import com.anjana.dao.TenantManager;  
 public class Main {  
      private static final int NTHREDS = 4;  
      public static void main(String[] args) {  
           ExecutorService executor = Executors.newFixedThreadPool(NTHREDS);  
           TenantManager tm=new TenantManager();  
           List l3=new ArrayList();  
           List l=(List) tm.getVersionList(1);  
           List l2=(List) tm.getVersionList(2);  
           //l.size number of tasks will be created --all these tasks will be executed nthreads  
           for (int i = 0; i <l.size(); i++) {  
                     executor.execute(new MyRunnable3(1,l.get(i).toString()));  
           }  
           //l2.size number of tasks will be created-all these tasks will be executed nthreads  
           for (int i = 0; i <l2.size(); i++) {  
                executor.execute(new MyRunnable3(2,l2.get(i).toString()));  
           }  
 //                 
           executor.shutdown();  
           // Wait until all threads are finish  
           while (!executor.isTerminated()) {  
           }  
           System.out.println("Finished all threads");  
      }  
 }  

 package com.anjana.threadpools;  
 import java.util.ArrayList;  
 import java.util.List;  
 import com.anjana.dao.TenantManager;  
 public class MyRunnable3 implements Runnable {  
      private String FVERSION_NAME;  
      private int ITENANT_ID;  
      private static int taskCount = 0;  
   private final int id = taskCount++;  
      public MyRunnable3(int i, String string) {  
           // TODO Auto-generated constructor stub  
           this.ITENANT_ID=i;  
           this.FVERSION_NAME=string;  
      }  
      @Override  
      public void run() {  
           TenantManager tm=new TenantManager();  
           List l=new ArrayList();  
           if(!FVERSION_NAME.equals("DEFAULT")&& !FVERSION_NAME.equals("MASTER")){  
           tm.getVersionList(ITENANT_ID);  
           l=tm.editversion(ITENANT_ID, FVERSION_NAME);  
           System.out.println(ITENANT_ID+":"+FVERSION_NAME +":"+Thread.currentThread().getName()+"\n-----\n"+l+"-----\n");  
     Thread.yield();  
           }  
           // TODO Auto-generated method stub  
      }  
 }  

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