Add chapters 9-17 for the java book

9 files changed, 630 insertions, 0 deletions

diff --git a/Java-Kompendium/kap15/build.gradle b/Java-Kompendium/kap15/build.gradle
new file mode 100644
index 0000000..eac925f
--- /dev/null
+++ b/Java-Kompendium/kap15/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 = 'Marks'
+}
diff --git a/Java-Kompendium/kap15/gradle/wrapper/gradle-wrapper.jar b/Java-Kompendium/kap15/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..8bdaf60
--- /dev/null
+++ b/Java-Kompendium/kap15/gradle/wrapper/gradle-wrapper.jar
diff --git a/Java-Kompendium/kap15/gradle/wrapper/gradle-wrapper.properties b/Java-Kompendium/kap15/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..2e11132
--- /dev/null
+++ b/Java-Kompendium/kap15/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.1.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/Java-Kompendium/kap15/gradlew b/Java-Kompendium/kap15/gradlew
new file mode 100755
index 0000000..adff685
--- /dev/null
+++ b/Java-Kompendium/kap15/gradlew
@@ -0,0 +1,248 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/Java-Kompendium/kap15/gradlew.bat b/Java-Kompendium/kap15/gradlew.bat
new file mode 100644
index 0000000..e509b2d
--- /dev/null
+++ b/Java-Kompendium/kap15/gradlew.bat
@@ -0,0 +1,93 @@
+@rem

+@rem Copyright 2015 the original author or authors.

+@rem

+@rem Licensed under the Apache License, Version 2.0 (the "License");

+@rem you may not use this file except in compliance with the License.

+@rem You may obtain a copy of the License at

+@rem

+@rem      https://www.apache.org/licenses/LICENSE-2.0

+@rem

+@rem Unless required by applicable law or agreed to in writing, software

+@rem distributed under the License is distributed on an "AS IS" BASIS,

+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

+@rem See the License for the specific language governing permissions and

+@rem limitations under the License.

+@rem

+@rem SPDX-License-Identifier: Apache-2.0

+@rem

+

+@if "%DEBUG%"=="" @echo off

+@rem ##########################################################################

+@rem

+@rem  Gradle startup script for Windows

+@rem

+@rem ##########################################################################

+

+@rem Set local scope for the variables with windows NT shell

+if "%OS%"=="Windows_NT" setlocal

+

+set DIRNAME=%~dp0

+if "%DIRNAME%"=="" set DIRNAME=.

+@rem This is normally unused

+set APP_BASE_NAME=%~n0

+set APP_HOME=%DIRNAME%

+

+@rem Resolve any "." and ".." in APP_HOME to make it shorter.

+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi

+

+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.

+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"

+

+@rem Find java.exe

+if defined JAVA_HOME goto findJavaFromJavaHome

+

+set JAVA_EXE=java.exe

+%JAVA_EXE% -version >NUL 2>&1

+if %ERRORLEVEL% equ 0 goto execute

+

+echo. 1>&2

+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2

+echo. 1>&2

+echo Please set the JAVA_HOME variable in your environment to match the 1>&2

+echo location of your Java installation. 1>&2

+

+goto fail

+

+:findJavaFromJavaHome

+set JAVA_HOME=%JAVA_HOME:"=%

+set JAVA_EXE=%JAVA_HOME%/bin/java.exe

+

+if exist "%JAVA_EXE%" goto execute

+

+echo. 1>&2

+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2

+echo. 1>&2

+echo Please set the JAVA_HOME variable in your environment to match the 1>&2

+echo location of your Java installation. 1>&2

+

+goto fail

+

+:execute

+@rem Setup the command line

+

+

+

+@rem Execute Gradle

+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*

+

+:end

+@rem End local scope for the variables with windows NT shell

+if %ERRORLEVEL% equ 0 goto mainEnd

+

+:fail

+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of

+rem the _cmd.exe /c_ return code!

+set EXIT_CODE=%ERRORLEVEL%

+if %EXIT_CODE% equ 0 set EXIT_CODE=1

+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%

+exit /b %EXIT_CODE%

+

+:mainEnd

+if "%OS%"=="Windows_NT" endlocal

+

+:omega

diff --git a/Java-Kompendium/kap15/src/main/java/Mark.java b/Java-Kompendium/kap15/src/main/java/Mark.java
new file mode 100644
index 0000000..d5bf856
--- /dev/null
+++ b/Java-Kompendium/kap15/src/main/java/Mark.java
@@ -0,0 +1,36 @@
+import javafx.beans.property.StringProperty;
+import javafx.beans.property.IntegerProperty;
+import javafx.beans.property.SimpleIntegerProperty;
+import javafx.beans.property.SimpleStringProperty;
+
+public class Mark {
+    private StringProperty subject;
+    private IntegerProperty mark;
+
+    public Mark(String subject, Integer mark) {
+        subjectProperty().set(subject);
+        markProperty().set(mark);
+    }
+
+    public StringProperty subjectProperty() {
+        if (this.subject == null) {
+            this.subject = new SimpleStringProperty(this, "subject");
+        }
+        return this.subject;
+    }
+
+    public IntegerProperty markProperty() {
+        if (this.mark == null) {
+            this.mark = new SimpleIntegerProperty(this, "mark");
+        }
+        return this.mark;
+    }
+
+    public String getSubject() {
+        return this.subjectProperty().get();
+    }
+
+    public Integer getMark() {
+        return this.markProperty().get();
+    }
+}
diff --git a/Java-Kompendium/kap15/src/main/java/Marks.java b/Java-Kompendium/kap15/src/main/java/Marks.java
new file mode 100644
index 0000000..6ec6c06
--- /dev/null
+++ b/Java-Kompendium/kap15/src/main/java/Marks.java
@@ -0,0 +1,127 @@
+import javafx.application.Application;
+import javafx.geometry.Pos;
+import javafx.scene.Scene;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.control.Separator;
+import javafx.scene.control.TableColumn;
+import javafx.scene.control.TableView;
+import javafx.scene.control.TextField;
+import javafx.scene.control.cell.PropertyValueFactory;
+import javafx.scene.layout.GridPane;
+import javafx.scene.text.Text;
+import javafx.stage.Stage;
+import java.sql.*;
+
+public class Marks extends Application {
+    private GridPane grid;
+    private Text status;
+    private Connection connection;
+
+    @Override
+    public void start(Stage stage) {
+        this.grid = new GridPane();
+        this.createStatus();
+        this.createTable();
+        this.createForm();
+        this.createSearch();
+
+        this.grid.setVgap(5);
+        this.grid.setHgap(5);
+        this.grid.setAlignment(Pos.CENTER);
+
+        var scene = new Scene(this.grid, 500, 400);
+
+        stage.setScene(scene);
+        stage.setTitle("Noten von Schülern");
+        stage.show();
+    }
+
+    private void createStatus() {
+        this.status = new Text();
+
+        this.grid.add(this.status, 0, 0, 2, 1);
+    }
+
+    private void createSearch() {
+        var field = new TextField();
+        var button = new Button("Suchen");
+        var line = new Separator();
+        var table = new TableView<Mark>();
+
+        try {
+            var handler = new SearchAction(this.connection, this.status, field);
+            table.setItems(handler.getMarks());
+
+            var subjectColumn = new TableColumn<Mark, String>("Fach");
+            subjectColumn.setCellValueFactory(
+                new PropertyValueFactory<>("subject" /* handler.getMarks().get(0).subjectProperty().getName() */)
+            );
+
+            var markColumn = new TableColumn<Mark, Integer>("Note");
+            markColumn.setCellValueFactory(
+                new PropertyValueFactory<>("mark" /* handler.getMarks().get(0).markProperty().getName() */)
+            );
+            table.getColumns().setAll(subjectColumn, markColumn);
+
+            button.setOnAction(handler);
+        } catch (SQLException exception) {
+            this.status.setText(exception.getMessage());
+        }
+        line.setMinSize(10, 10);
+
+        this.grid.add(line, 0, 6, 2, 1);
+        this.grid.add(button, 0, 7);
+        this.grid.add(field, 1, 7);
+        this.grid.add(table, 0, 8, 2, 1);
+    }
+
+    private void createForm() {
+        var nameField = new TextField();
+        var nameLabel = new Label("Name");
+        var englishField = new TextField();
+        var englishLabel = new Label("Englisch");
+        var germanField = new TextField();
+        var germanLabel = new Label("Deutsch");
+        var mathField = new TextField();
+        var mathLabel = new Label("Mathematik");
+        var saveButton = new Button("Speichern");
+
+        try {
+            var action = new SaveAction(this.connection, nameField, englishField, germanField, mathField, this.status);
+            saveButton.setOnAction(action);
+        } catch (SQLException exception) {
+            this.status.setText(exception.getMessage());
+        }
+
+        this.grid.add(nameLabel, 0, 1);
+        this.grid.add(nameField, 1, 1);
+        this.grid.add(englishLabel, 0, 2);
+        this.grid.add(englishField, 1, 2);
+        this.grid.add(germanLabel, 0, 3);
+        this.grid.add(germanField, 1, 3);
+        this.grid.add(mathLabel, 0, 4);
+        this.grid.add(mathField, 1, 4);
+        this.grid.add(saveButton, 1, 5);
+    }
+
+    private void createTable() {
+        try {
+            var host = "jdbc:hsqldb:mem:mitarbeiter;shutdown=true";
+            this.connection = DriverManager.getConnection(host);
+            var statement = connection.createStatement();
+
+            statement.executeUpdate("""
+                CREATE TABLE IF NOT EXISTS marks (
+                    mark_id identity PRIMARY KEY,
+                    name VARCHAR,
+                    english integer,
+                    german integer,
+                    math integer
+                )
+            """);
+        } catch (SQLException exception) {
+            this.status.setText(exception.getMessage());
+        }
+    }
+}
diff --git a/Java-Kompendium/kap15/src/main/java/SaveAction.java b/Java-Kompendium/kap15/src/main/java/SaveAction.java
new file mode 100644
index 0000000..a1c0e9b
--- /dev/null
+++ b/Java-Kompendium/kap15/src/main/java/SaveAction.java
@@ -0,0 +1,50 @@
+import javafx.event.EventHandler;
+import javafx.event.ActionEvent;
+import javafx.scene.control.TextField;
+import javafx.scene.text.Text;
+import java.sql.*;
+
+public class SaveAction implements EventHandler<ActionEvent> {
+    private TextField name;
+    private TextField english;
+    private TextField german;
+    private TextField math;
+    private Text status;
+    private PreparedStatement statement;
+
+    public SaveAction(
+        Connection connection,
+        TextField name,
+        TextField english,
+        TextField german,
+        TextField math,
+        Text status
+    ) throws SQLException {
+        this.statement = connection.prepareStatement(
+            "INSERT INTO marks (name, english, german, math) VALUES (?, ?, ?, ?)"
+        );
+        this.name = name;
+        this.english = english;
+        this.german = german;
+        this.math = math;
+        this.status = status;
+    }
+
+    public void handle(ActionEvent event) {
+        try {
+            this.statement.setString(1, this.name.getText());
+            this.statement.setInt(2, Integer.parseInt(this.english.getText()));
+            this.statement.setInt(3, Integer.parseInt(this.german.getText()));
+            this.statement.setInt(4, Integer.parseInt(this.math.getText()));
+
+            this.statement.execute();
+
+            this.name.setText("");
+            this.english.setText("");
+            this.german.setText("");
+            this.math.setText("");
+        } catch (SQLException exception) {
+            this.status.setText(exception.getMessage());
+        }
+    }
+}
diff --git a/Java-Kompendium/kap15/src/main/java/SearchAction.java b/Java-Kompendium/kap15/src/main/java/SearchAction.java
new file mode 100644
index 0000000..45aa84f
--- /dev/null
+++ b/Java-Kompendium/kap15/src/main/java/SearchAction.java
@@ -0,0 +1,44 @@
+import javafx.collections.ObservableList;
+import javafx.event.ActionEvent;
+import javafx.event.EventHandler;
+import javafx.scene.control.TextField;
+import javafx.scene.text.Text;
+import java.sql.*;
+import javafx.collections.FXCollections;
+
+public class SearchAction implements EventHandler<ActionEvent> {
+    private Text status;
+    private TextField field;
+    private PreparedStatement statement;
+    private ObservableList<Mark> marks = FXCollections.observableArrayList();
+
+    public SearchAction(Connection connection, Text status, TextField field) throws SQLException {
+        this.statement = connection.prepareStatement(
+            "SELECT english, german, math FROM marks WHERE name LIKE ?"
+        );
+        this.status = status;
+        this.field = field;
+    }
+
+    public void handle(ActionEvent action) {
+        try {
+            this.statement.setString(1, this.field.getText());
+            this.statement.execute();
+
+            var results = this.statement.getResultSet();
+
+            this.marks.clear();
+            if (results.next()) {
+                this.marks.add(new Mark("Englisch", results.getInt(1)));
+                this.marks.add(new Mark("Deutsch", results.getInt(2)));
+                this.marks.add(new Mark("Mathematik", results.getInt(3)));
+            }
+        } catch (Exception exception) {
+            this.status.setText(exception.getMessage());
+        }
+    }
+
+    public ObservableList<Mark> getMarks() {
+        return this.marks;
+    }
+}