hello/java/samples/multithread/GazStation/src/gazstation/FilingColumn.java

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package gazstation;

import java.util.Random;

/**
 *
 * @author denis
 */
class FilingColumn {
    
    private int bigTank;
    private boolean isOrder;
    
    public FilingColumn (){
        bigTank = new Random().nextInt(500);
        isOrder = true;
    }

    
    public synchronized boolean getFuel(int fuel) {
        if(isOrder){
            if(bigTank<fuel){
                isOrder = false;
                GazStation.getState().callGazProducer(this);
                return false;
            }
            bigTank -= fuel;
        }
        return isOrder;
    }
    
    public synchronized void addFuel(int fuel){
        bigTank += fuel;
        System.out.println("Объем цистерны: " + bigTank + " л.");
        isOrder = true;
        notifyAll();
    }
}