Add chapters 9-17 for the java book

Java-Kompendium/kap17/build.gradle

@@ -0,0 +1,25 @@
+plugins {
+  id 'application'
+  id 'org.openjfx.javafxplugin' version '0.1.0'
+}
+
+repositories {
+    mavenCentral()
+}
+
+javafx {
+    version = '21'
+    modules = ['javafx.controls']
+}
+
+dependencies {
+    runtimeOnly 'org.hsqldb:hsqldb:2.7.4'
+}
+
+run {
+    standardInput = System.in
+}
+
+application {
+    mainClass = 'Hauptfenster'
+}