jb12.0 threads.enums, Java

jb12.0 threads.enums

Language: Layout:

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

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

class Rextester
{  
    public static void main(String args[]) throws InterruptedException
    {
        Signals signal = Signals.RED;
        System.out.println(signal);
        
        TraficLights tl = new TraficLights();
        Thread t = new Thread(tl, "trafic light");
        t.start();
        Thread.sleep(150);
        for(int i = 0; i<20; i++){
            signal = tl.getSignal();
            System.out.printf("%s:\t%s\twait time = %s %s\n", Calendar.getInstance().get(Calendar.MILLISECOND), signal, signal.getWaitTime(), t.isAlive());
            //tl.waitChange();
        }
        tl.stop();
        //t.join();
        for(int i =0; i<50; i++)
        System.out.printf("%s, stoped - %s:\t%s\twait time = %s %s\n", i, Calendar.getInstance().get(Calendar.MILLISECOND), signal, signal.getWaitTime(), t.isAlive());
    }
}

enum Signals{
    RED(150), YELLOW(30), GREEN(500);
    
    private int _waitTime;
    
    public int getWaitTime(){
        return _waitTime;
    }
    
    Signals(int waitTime){
        _waitTime = waitTime;
    }
}

class TraficLights implements Runnable{
    private Signals _signal;
    private boolean _stop;
    private boolean _waiting = true;
    
    public void run(){
        while(!_stop){
            try{
            switch(_signal){
                case RED:    Thread.sleep(_signal.getWaitTime()); break;
                case YELLOW: Thread.sleep(_signal.getWaitTime()); break;
                case GREEN:  Thread.sleep(_signal.getWaitTime()); break;
            }
            }catch(InterruptedException e){
                System.out.println("error, interrupted sleep");
                System.out.println(e);
            }
            changeSignal();
            _waiting = false;
        }
    }
    
    synchronized private void changeSignal(){
        switch(_signal){
                case RED:    _signal = Signals.YELLOW; break;
                case YELLOW: _signal = Signals.GREEN; break;
                case GREEN:  _signal = Signals.RED; break;
            }
        notify();
    }
    
    synchronized public void waitChange(){
        try{
            while(_waiting) wait();
        }catch(InterruptedException e){
            System.out.println("error, interrupted wait");
            System.out.println(e);
        }
        _waiting = true;
    }
    
    public void stop(){
        _stop = true;
    }
    
    public Signals getSignal(){
        return _signal;
    }
    
    TraficLights(Signals signal){
        _signal = signal;
    }
    
    TraficLights(){
        _signal = Signals.RED;
    }
}

[ + ] Show input
Compilation time: 0.83 sec, absolute running time: 0.33 sec, cpu time: 0.25 sec, memory peak: 21 Mb, absolute service time: 1,17 sec

RED 20: RED wait time = 150 true 34: YELLOW wait time = 30 true 34: YELLOW wait time = 30 true 35: YELLOW wait time = 30 true 35: YELLOW wait time = 30 true 35: YELLOW wait time = 30 true 35: YELLOW wait time = 30 true 36: YELLOW wait time = 30 true 36: YELLOW wait time = 30 true 36: YELLOW wait time = 30 true 36: YELLOW wait time = 30 true 36: YELLOW wait time = 30 true 37: YELLOW wait time = 30 true 37: YELLOW wait time = 30 true 37: YELLOW wait time = 30 true 37: YELLOW wait time = 30 true 38: YELLOW wait time = 30 true 38: YELLOW wait time = 30 true 38: YELLOW wait time = 30 true 38: YELLOW wait time = 30 true 0, stoped - 38: YELLOW wait time = 30 true 1, stoped - 39: YELLOW wait time = 30 true 2, stoped - 39: YELLOW wait time = 30 true 3, stoped - 39: YELLOW wait time = 30 true 4, stoped - 39: YELLOW wait time = 30 true 5, stoped - 39: YELLOW wait time = 30 true 6, stoped - 40: YELLOW wait time = 30 true 7, stoped - 40: YELLOW wait time = 30 true 8, stoped - 40: YELLOW wait time = 30 false 9, stoped - 40: YELLOW wait time = 30 false 10, stoped - 41: YELLOW wait time = 30 false 11, stoped - 41: YELLOW wait time = 30 false 12, stoped - 41: YELLOW wait time = 30 false 13, stoped - 41: YELLOW wait time = 30 false 14, stoped - 41: YELLOW wait time = 30 false 15, stoped - 42: YELLOW wait time = 30 false 16, stoped - 42: YELLOW wait time = 30 false 17, stoped - 42: YELLOW wait time = 30 false 18, stoped - 42: YELLOW wait time = 30 false 19, stoped - 42: YELLOW wait time = 30 false 20, stoped - 43: YELLOW wait time = 30 false 21, stoped - 43: YELLOW wait time = 30 false 22, stoped - 43: YELLOW wait time = 30 false 23, stoped - 43: YELLOW wait time = 30 false 24, stoped - 43: YELLOW wait time = 30 false 25, stoped - 44: YELLOW wait time = 30 false 26, stoped - 44: YELLOW wait time = 30 false 27, stoped - 44: YELLOW wait time = 30 false 28, stoped - 44: YELLOW wait time = 30 false 29, stoped - 44: YELLOW wait time = 30 false 30, stoped - 45: YELLOW wait time = 30 false 31, stoped - 45: YELLOW wait time = 30 false 32, stoped - 45: YELLOW wait time = 30 false 33, stoped - 45: YELLOW wait time = 30 false 34, stoped - 45: YELLOW wait time = 30 false 35, stoped - 46: YELLOW wait time = 30 false 36, stoped - 46: YELLOW wait time = 30 false 37, stoped - 46: YELLOW wait time = 30 false 38, stoped - 46: YELLOW wait time = 30 false 39, stoped - 46: YELLOW wait time = 30 false 40, stoped - 47: YELLOW wait time = 30 false 41, stoped - 47: YELLOW wait time = 30 false 42, stoped - 47: YELLOW wait time = 30 false 43, stoped - 47: YELLOW wait time = 30 false 44, stoped - 47: YELLOW wait time = 30 false 45, stoped - 48: YELLOW wait time = 30 false 46, stoped - 48: YELLOW wait time = 30 false 47, stoped - 48: YELLOW wait time = 30 false 48, stoped - 48: YELLOW wait time = 30 false 49, stoped - 48: YELLOW wait time = 30 false