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7 changed files with 159 additions and 1 deletions

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@ -6,6 +6,5 @@ Lösungen zu den Aufgaben der Vorlesung "Programmieren" des ersten und zweiten S
- **Editor**: [Visual Studio Code](https://code.visualstudio.com/)
- [Extension Pack for Java](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-pack)
- [EditorConfig for VS Code](https://marketplace.visualstudio.com/items?itemName=EditorConfig.EditorConfig)
- [Rainbow Brackets](https://marketplace.visualstudio.com/items?itemName=tal7aouy.rainbow-bracket)
- **Java**: [Java Development Kit 21 (LTS)](https://www.oracle.com/de/java/technologies/downloads/#java21)
- **Style Guide**: [Google Java Style Guide](https://github.com/google/styleguide/blob/gh-pages/eclipse-java-google-style.xml)

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@ -0,0 +1,18 @@
package VL14.Aufgabe01;
/**
* Vorlesung 14 / Aufgabe 1
*
* @author Sebastian Brosch
*/
class Aufgabe01 {
public static void main(String[] args) {
Counter counterUp = new Counter("T1", 1, 100);
Counter counterDown = new Counter("T2", -10);
Thread threadCounterUp = new Thread(counterUp);
Thread threadCounterDown = new Thread(counterDown);
threadCounterUp.start();
threadCounterDown.start();
}
}

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@ -0,0 +1,56 @@
package VL14.Aufgabe01;
/**
* Class representing a counter.
*
* @author Sebastian Brosch
*/
public class Counter implements Runnable {
static int counter;
// some information of the counter.
private int number;
private String name;
/**
* Create a new counter with initializing the start value.
*
* @param name The name of the counter.
* @param number The number to increment or decrement the counter.
* @param start The start value of the counter.
*/
public Counter(String name, int number, int start) {
this(name, number);
counter = start;
}
/**
* Create a new counter without initializing the start value.
*
* @param name The name of the counter.
* @param number The number to increment or decrement the counter.
*/
public Counter(String name, int number) {
this.number = number;
this.name = name;
}
/**
* Method to run some code in a Thread.
*/
public void run() {
while (counter > 0 && counter < 1000) {
this.count();
}
}
/**
* Method to increment or decrement the counter.
*/
private void count() {
synchronized (getClass()) {
counter += this.number;
System.out.printf("%3d [%s: %3d]\n", counter, this.name, this.number);
}
}
}

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@ -0,0 +1,27 @@
package VL14.Aufgabe02;
/**
* Vorlesung 14 / Aufgabe 2
*
* @author Sebastian Brosch
*/
public class Aufgabe02 {
public static void main(String[] args) {
final int NUMBER_OF_USERS = 5;
final int NUMBER_OF_PRINTERS = 2;
// create some users.
for (int u = 0; u < NUMBER_OF_USERS; u++) {
User user = new User();
Thread threadUser = new Thread(user);
threadUser.start();
}
// create some printers.
for (int p = 0; p < NUMBER_OF_PRINTERS; p++) {
Printer printer = new Printer();
Thread threadPrinter = new Thread(printer);
threadPrinter.start();
}
}
}

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@ -0,0 +1,23 @@
package VL14.Aufgabe02;
/**
* Class which represents a printer.
*
* @author Sebastian Brosch
*/
public class Printer implements Runnable {
public void run() {
while (true) {
synchronized (PrinterQueue.queue) {
if (PrinterQueue.queue.size() > 0) {
System.out.println(PrinterQueue.queue.poll());
}
}
try {
Thread.sleep(500);
} catch (InterruptedException e) {
}
}
}
}

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@ -0,0 +1,12 @@
package VL14.Aufgabe02;
import java.util.LinkedList;
/**
* Class which represents a printer queue.
*
* @author Sebastian Brosch
*/
public class PrinterQueue {
static LinkedList<String> queue = new LinkedList<String>();
}

23
VL14/Aufgabe02/User.java Normal file
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@ -0,0 +1,23 @@
package VL14.Aufgabe02;
/**
* Class which represents a user.
*
* @author Sebastian Brosch
*/
public class User implements Runnable {
private int number = 0;
public void run() {
while (true) {
synchronized (PrinterQueue.queue) {
PrinterQueue.queue.add(Thread.currentThread().getName() + ": " + this.number++);
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
}
}
}