jb11.0 threads, Java

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;
import java.io.*;

class Rextester
{  
    public static void main(String args[])
    {
        System.out.println("начало выполнения основного потока");
        
        MyThread mt = new MyThread("test thread 1");
        Thread th = new Thread(mt);
        th.start();
        
        try{
            for(int i=0; i<15; i++){
                Thread.sleep(100);
                mt.setDellay((100*(i+1))/2);
                //System.out.println("в основном потоке счётчик= " + i);
                System.out.print('.');
            }
        }catch(InterruptedException exp){
            System.out.println("Основной поток прерван.");
        }
        
        System.out.println("завершение основного потока");
        
    }
}

class MyThread implements Runnable{
    String _thrName;
    int _dellay;
    
    public MyThread(String thrName){
        _thrName = thrName;
        _dellay = 100;
    }
    
    public void run(){
        System.out.println(_thrName + " - запуск");
        int tmpDel = 0;
        try{
            for(int i=0; i<10; i++){
                tmpDel = _dellay;
                Thread.sleep(tmpDel);
                System.out.println("|" + _thrName + " задержка = "+tmpDel+" счётчик = " + i);
            }
        }catch(InterruptedException exc){
            System.out.println("Exception in " + _thrName + ": thread interrupt.");
        }
        
        System.out.println("Поток " + _thrName + " завершение.");
    }
    
    public void setDellay(int dellay){
        _dellay = dellay;
    }
    
}

[ + ] Show input
Compilation time: 0.85 sec, absolute running time: 2.95 sec, cpu time: 1.07 sec, memory peak: 18 Mb, absolute service time: 3,81 sec