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some changes from practice group

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This commit is contained in:
Sebastian Brosch 2024-06-10 15:20:28 +02:00
parent e1eaf252de
commit 1f0c7abff6
4 changed files with 21 additions and 32 deletions
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20
VL14/Aufgabe02/Aufgabe02.java
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@ -8,23 +8,21 @@ import java.util.Random;
* @author Sebastian Brosch * @author Sebastian Brosch
*/ */
public class Aufgabe02 { public class Aufgabe02 {
public static void main(String[] args) { public static void main(String[] args) throws Exception {
final int NUMBER_OF_USERS = 10; final int NUMBER_OF_USERS = 2;
final int NUMBER_OF_PRINTERS = 2; final int NUMBER_OF_PRINTERS = 2;
// create some users.
for (int u = 0; u < NUMBER_OF_USERS; u++) {
User user = new User(getRandomNumber(1, 10) * 1000);
Thread threadUser = new Thread(user);
threadUser.start();
}
// create some printers. // create some printers.
for (int p = 0; p < NUMBER_OF_PRINTERS; p++) { for (int p = 0; p < NUMBER_OF_PRINTERS; p++) {
Printer printer = new Printer(); Thread threadPrinter = new Thread(new Printer());
Thread threadPrinter = new Thread(printer);
threadPrinter.start(); threadPrinter.start();
} }
// create some users.
for (int u = 0; u < NUMBER_OF_USERS; u++) {
Thread threadUser = new Thread(new User(getRandomNumber(1, 10) * 1000));
threadUser.start();
}
} }
/** /**

8
VL14/Aufgabe02/Printer.java
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@ -10,12 +10,8 @@ public class Printer implements Runnable {
while (true) { while (true) {
synchronized (PrinterQueue.queue) { synchronized (PrinterQueue.queue) {
if (PrinterQueue.queue.size() > 0) { if (PrinterQueue.queue.size() > 0) {
System.out.println("Printer " + Thread.currentThread().threadId() + " prints: " + PrinterQueue.queue.poll()); System.out.println("Printer " + Thread.currentThread().threadId() + " prints: " + PrinterQueue.queue.getFirst());
} else { PrinterQueue.queue.removeFirst();
try {
PrinterQueue.queue.wait();
} catch (InterruptedException e) {
}
} }
} }
} }

6
VL14/Aufgabe02/PrinterQueue.java
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@ -1,6 +1,8 @@
package VL14.Aufgabe02; package VL14.Aufgabe02;
import java.util.LinkedList; import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/** /**
* Class which represents a printer queue. * Class which represents a printer queue.
@ -8,5 +10,5 @@ import java.util.LinkedList;
* @author Sebastian Brosch * @author Sebastian Brosch
*/ */
public class PrinterQueue { public class PrinterQueue {
static LinkedList<Integer> queue = new LinkedList<Integer>(); static List<Object> queue = Collections.synchronizedList(new ArrayList<>());
} }

15
VL14/Aufgabe02/User.java
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@ -7,7 +7,7 @@ package VL14.Aufgabe02;
*/ */
public class User implements Runnable { public class User implements Runnable {
private int number = 0; private int number = 0;
private int wait = 0; private long wait = 0;
/** /**
* Constructor to initialize a User. * Constructor to initialize a User.
@ -26,18 +26,11 @@ public class User implements Runnable {
} }
public void run() { public void run() {
while (true) { while (this.wait > 0) {
synchronized (PrinterQueue.queue) {
int data = this.number++; int data = this.number++;
PrinterQueue.queue.add(data); PrinterQueue.queue.add(data);
System.out.println("User " + Thread.currentThread().threadId() + " adds: " + data); System.out.println("User " + Thread.currentThread().threadId() + " added " + data);
PrinterQueue.queue.notifyAll(); this.wait--;
}
try {
Thread.sleep(this.wait);
} catch (InterruptedException e) {
}
} }
} }
} }