Hallo Leute,
ich möchte viel üben und habe diese Programmierbeispiel aufgetrieben. in der ausgabe haben doch beide Barmen 6 Bier und warum wird bei Barmen1 doppelt bier genommen?Wo liegt mein Fehler?
In our scenario there are exactly 2 Oktoberfest barmen. These barmen fill a complete
Maß (beer mug) every 2 seconds. Whenever a Maß is filled, the simulator should print
the following text to the console (i.e., usingSystem.out.println):
Barman x: There are currently y Masz waiting to be served. Obviously,x indicates which barman is meant (out of the 2) and y the actual number
of beers that are currently ready to be served to the customers.
There are exactly 15 Oktoberfest waitresses. One waitress is able to carry 6 Maß at once.
It takes her 5 to 10 seconds (random) to deliver one of the Maß she is currently carrying.
She has to get a new set of Maß from the barmen as soon has she has delivered all 6
Maß. It takes her 15 seconds to get back to the bar. Note that the waitress has to wait
for the barmen to draw additional Maß in case there are not at least 6 Maß available.
Whenever a waitress delivered a Maß the simulator should print the following:
Waitress x: Prost! Now I have got y Masz left.
Note that the number
x
is supposed to indicate which waitress (out of the existing 15) is
meant and
y
should reflect the actual number of Maß the waitress is currently carrying.
Additionally, the simulator should print the following whenever a waitress has to get
back to the barman:
Waitress x: I need to get a new set of Mas
Every 5 seconds 4 to 10 new customers (random) are entering the location. Every cus-
tomer orders and drinks exactly 1 Maß and leaves afterwards. Whenever a customer is
served the simulator should print the following text:
Customer: Thanks! I had to wait x seconds to get my Masz from Waitress y.
Note that
x
denotes the amount of seconds that the corresponding customer had to wait
to get the Maß delivered and
y
indicates the waitress who delivered the beer
public class Waitress extends Thread {
private String name;
Barman barman1;
Barman barman2;
private static final int MIN = 5;
private static final int MAX = 10;
public Waitress(String name, Barman barman1, Barman barman2) {
this.name = name;
this.barman1 = barman1;
this.barman2 = barman2;
}
public String getWaitressName() {
return this.name;
}
@Override
public synchronized void run() {
while (true) {
while (takeBier() == false) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
for (int i = 5; i >= 0; i--) {
try {
Thread.sleep(random(MIN, MAX) * 1000);
Oktoberfest.customers.get(0).setWaitress(this);
Oktoberfest.customers.remove(0);
System.out.println("Waitress " + name + " Prost! now I have got " + i + " Masz left");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
try {
System.out.println("Waitress " + name + "I need to get a new set of Masz");
Thread.sleep(15000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public boolean takeBier() {
if (barman1.isEnought() == true) {
barman1.entleeren();
return true;
} else if (barman2.isEnought() == true) {
barman2.entleeren();
return true;
} else
return false;
}
public static int random(int min, int max) {
return (int) (min + Math.random() * (max - min));
}
}
public class Barman extends Thread {
private String name;
private int anzahl = 0;
public Barman(String name) {
this.name = name;
}
@Override
public synchronized void run() {
while (true) {
try {
Thread.sleep(2000);
fillBier();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void fillBier() {
anzahl++;
System.err.println("Barmen " + name + " there are currently " + anzahl + " Masz waiting to be served");
}
public boolean isEnought() {
if (anzahl >= 6) {
return true;
} else {
return false;
}
}
public void entleeren() {
anzahl = anzahl - 6;
}
}
public class Customer extends Thread {
private String name;
private long millisEnter = System.currentTimeMillis();
private Waitress waitress = null;
@Override
public synchronized void run() {
while (waitress == null) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
long millisBeerReceived = System.currentTimeMillis();
System.out.println("Customer: Thanks! I had to wait " + (millisBeerReceived - millisEnter) / 1000
+ " seconds to get my Masz from Waitress " + waitress.getWaitressName());
}
public void setWaitress(Waitress waitress) {
this.waitress = waitress;
}
}
import java.util.ArrayList;
import java.util.List;
public class Oktoberfest {
public static List<Customer> customers = new ArrayList<Customer>();
public static void main(String[] args) throws InterruptedException {
synchronized (args) {
Barman barman1 = new Barman("1");
Barman barman2 = new Barman("2");
barman1.start();
barman2.start();
List<Waitress> waitres = new ArrayList<Waitress>();
for (int i = 0; i < 15; i++) {
Waitress w1 = new Waitress(String.valueOf(i + 1), barman1, barman2);
waitres.add(w1);
w1.start();
}
while (true) {
for (int i = 0; i < Waitress.random(4, 10); i++) {
Customer customer = new Customer();
customers.add(customer);
customer.start();
}
Thread.sleep(5 * 1000);
}
}
}
}
AUSGABE
Barmen 1 there are currently 5 Masz waiting to be served
Barmen 2 there are currently 6 Masz waiting to be served
Barmen 1 there are currently 6 Masz waiting to be served
Barmen 2 there are currently 1 Masz waiting to be served
Barmen 1 there are currently -5 Masz waiting to be served
Barmen 2 there are currently 2 Masz waiting to be served
Barmen 1 there are currently -4 Masz waiting to be served
Waitress 4 Prost! now I have got 5 Masz left
Customer: Thanks! I had to wait 17 seconds to get my Masz from Waitress 4
Barmen 2 there are currently 3 Masz waiting to be served
Barmen 1 there are currently -3 Masz waiting to be served
