Is there anyway to stop a thread when it's running and running another thread at specific time?

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Java

It's me again. I have some problem here. Here is the code

class Thread1 extends Thread {
    int i=0;
    public void run(){
            try{
                for(i=0; i<10; i++){
                    System.out.println("Print this 10 times");
                    System.out.println("Timer: "+(i+1));
                    Thread.sleep(1000);
                }
            }
            catch(Exception ex){}
        }
    }

class Thread2 extends Thread {
    public void run(){
        try{
            for(int i=0; i<10; i++){
                System.out.println("Timer: "+(i+1));
                Thread.sleep(1000);
            }
        }
        catch(Exception ex){}
    }
}

Each thread run in 10 seconds.

Now is must create the main thread with this request: Execute the program and run the Thread1 first. Then at 5 seconds, stop Thread1 and run Thread2. Then terminate the program at 10 seconds. And of course: without touching Thread1 and Thread2.

I tried System.currentTimeMillis() but no luck. Are there any other way to measure the thread's running time and stop it at specific point?

Thank you very much!