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Thread: how to assign different task to different threads

  1. #1
    Junior Member
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    Default how to assign different task to different threads

    Please go through this code and help me to achieve the desired output

    import java.util.Date;
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    import cyclicbarrier.Hashmap;
    public class ThreadpoolDemo {
    private static final int nthreads=10;
    public static void main(String[] args) throws InterruptedException {
    ExecutorService exe=Executors.newFixedThreadPool(nthreads);
    for(int i=1;i<7;i++)
    {
    Runnable worker=new Myrunnable(i);
    exe.execute(worker);
    }
    exe.shutdown();
    }
    }
    class Myrunnable implements Runnable
    {
    private int ii;
    Myrunnable(int i)
    {
    ii=i;
    }
    public void run()
    {
    Hashmap hsamap=new Hashmap();
    System.out.println(hsamap.getcity(ii));
    System.out.println(Thread.currentThread().getName( )+" Executed this");
    Thread.currentThread().stop();
    System.out.println(new Date());
    }
    }

    import java.util.HashMap;
    public class Hashmap {
    public String getcity(int i)
    {
    HashMap<Integer,String> hm=new HashMap<Integer,String>();
    hm.put(1, "AAAA");
    hm.put(2, "BBBB");
    hm.put(3, "CCCC");
    hm.put(4, "DDDD");
    hm.put(5, "EEEE");
    hm.put(6, "FFFF");
    String value=hm.get(i);
    return value;
    }
    }

    Output:
    BBBB
    pool-1-thread-2 Executed this
    DDDD
    pool-1-thread-4 Executed this
    FFFF
    pool-1-thread-6 Executed this
    AAAA
    pool-1-thread-1 Executed this
    CCCC
    pool-1-thread-3 Executed this
    EEEE
    pool-1-thread-5 Executed this

    now if I change the values to for(int i=3;i<7;i++),I should get the output as
    DDDD
    pool-1-thread-4 Executed this
    EEEE
    pool-1-thread-5 Executed this
    FFFF
    pool-1-thread-6 Executed this
    means Thread 1 should always display "AAAA" if i request,Thread 2 should always display "BBBB" and so on Please tell me how can i achieve this. or else if I assign i=3; then thread 3 only should display corresponding Hashmap values,if I assign i=5;then thread 5 only should display corresponding Hashmap values. Thanks in advance


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: how to assign different task to different threads

    Please edit your post and wrap your code with code tags:
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.

    Can you add some comments to the output describing what you want it to look like. For example:
    BBBB <<<<<<<<<<<<<THIS SHOULD BE AAAA
    pool-1-thread-2 Executed this
    DDDD
    pool-1-thread-4 Executed this
    If you don't understand my answer, don't ignore it, ask a question.

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