Add chapters 18-20 for the java book

5 files changed, 83 insertions, 0 deletions

diff --git a/Java-Kompendium/kap20/2/src/main/java/App.java b/Java-Kompendium/kap20/2/src/main/java/App.java
new file mode 100644
index 0000000..417e73a
--- /dev/null
+++ b/Java-Kompendium/kap20/2/src/main/java/App.java
@@ -0,0 +1,12 @@
+public class App {
+    public static void main(String[] args) throws InterruptedException {
+        var server = new Server();
+        server.start();
+
+        server.lock.acquire();
+        Client.client();
+        server.lock.release();
+
+        Runtime.getRuntime().exit(0);
+    }
+}
diff --git a/Java-Kompendium/kap20/2/src/main/java/Client.java b/Java-Kompendium/kap20/2/src/main/java/Client.java
new file mode 100644
index 0000000..a59613d
--- /dev/null
+++ b/Java-Kompendium/kap20/2/src/main/java/Client.java
@@ -0,0 +1,29 @@
+import java.io.*;
+import java.rmi.NotBoundException;
+import java.rmi.RemoteException;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+
+public class Client {
+    public static void client() {
+        try {
+            Registry registrierung = LocateRegistry.getRegistry();
+            RMIInterface server = (RMIInterface) registrierung.lookup("RMIAufgabe");
+
+            InputStreamReader isr = new InputStreamReader(System.in);
+            BufferedReader br = new BufferedReader(isr);
+
+            System.out.print("Geben Sie den ersten Wert ein: ");
+            int wert1 = Integer.parseInt(br.readLine());
+
+            System.out.print("Geben Sie den zweiten Wert ein: ");
+            int wert2 = Integer.parseInt(br.readLine());
+
+            int ergebnis = server.wertBerechnen(wert1, wert2);
+            System.out.println("Ergebnis: " + ergebnis);
+        } catch (IOException | NotBoundException e) {
+            System.out.println("Client: ");
+            System.out.println(e);
+        }
+    }
+}
diff --git a/Java-Kompendium/kap20/2/src/main/java/RMIInterface.java b/Java-Kompendium/kap20/2/src/main/java/RMIInterface.java
new file mode 100644
index 0000000..8e5e165
--- /dev/null
+++ b/Java-Kompendium/kap20/2/src/main/java/RMIInterface.java
@@ -0,0 +1,6 @@
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+
+public interface RMIInterface extends Remote {
+    int wertBerechnen(int wert1, int wert2) throws RemoteException;
+}
diff --git a/Java-Kompendium/kap20/2/src/main/java/RMIKlasse.java b/Java-Kompendium/kap20/2/src/main/java/RMIKlasse.java
new file mode 100644
index 0000000..28fe832
--- /dev/null
+++ b/Java-Kompendium/kap20/2/src/main/java/RMIKlasse.java
@@ -0,0 +1,5 @@
+public class RMIKlasse implements RMIInterface {
+    public int wertBerechnen(int wert1, int wert2) {
+        return wert1 * wert2;
+    }
+}
diff --git a/Java-Kompendium/kap20/2/src/main/java/Server.java b/Java-Kompendium/kap20/2/src/main/java/Server.java
new file mode 100644
index 0000000..14c013a
--- /dev/null
+++ b/Java-Kompendium/kap20/2/src/main/java/Server.java
@@ -0,0 +1,31 @@
+import java.rmi.RemoteException;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+import java.rmi.server.UnicastRemoteObject;
+
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class Server extends Thread {
+    public final Semaphore lock = new Semaphore(1);
+
+    public Server() throws InterruptedException {
+        this.lock.acquire();
+    }
+
+    @Override
+    public void run() {
+        try {
+            RMIInterface server = new RMIKlasse();
+            RMIInterface stub = (RMIInterface) UnicastRemoteObject.exportObject((RMIInterface) server, 0);
+            Registry registrierung = LocateRegistry.createRegistry(1099);
+            registrierung.rebind("RMIAufgabe", stub);
+        } catch (RemoteException e) {
+            System.out.println("Server: ");
+            System.out.println(e);
+        } finally {
+            this.lock.release();
+        }
+    }
+}