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added pages 7-9

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Sven Vogel 2023-05-10 22:22:07 +02:00
parent 39db3138b3
commit 159ea29192
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3
.idea/modules.xml
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<module fileurl="file://$PROJECT_DIR$/AufgabenBlatt3/AufgabenBlatt3.iml" filepath="$PROJECT_DIR$/AufgabenBlatt3/AufgabenBlatt3.iml" /> <module fileurl="file://$PROJECT_DIR$/AufgabenBlatt3/AufgabenBlatt3.iml" filepath="$PROJECT_DIR$/AufgabenBlatt3/AufgabenBlatt3.iml" />
<module fileurl="file://$PROJECT_DIR$/AufgabenBlatt4/AufgabenBlatt4.iml" filepath="$PROJECT_DIR$/AufgabenBlatt4/AufgabenBlatt4.iml" /> <module fileurl="file://$PROJECT_DIR$/AufgabenBlatt4/AufgabenBlatt4.iml" filepath="$PROJECT_DIR$/AufgabenBlatt4/AufgabenBlatt4.iml" />
<module fileurl="file://$PROJECT_DIR$/AufgabenBlatt6/AufgabenBlatt6.iml" filepath="$PROJECT_DIR$/AufgabenBlatt6/AufgabenBlatt6.iml" /> <module fileurl="file://$PROJECT_DIR$/AufgabenBlatt6/AufgabenBlatt6.iml" filepath="$PROJECT_DIR$/AufgabenBlatt6/AufgabenBlatt6.iml" />
<module fileurl="file://$PROJECT_DIR$/AufgabenBlatt7/AufgabenBlatt7.iml" filepath="$PROJECT_DIR$/AufgabenBlatt7/AufgabenBlatt7.iml" />
<module fileurl="file://$PROJECT_DIR$/AufgabenBlatt8/AufgabenBlatt8.iml" filepath="$PROJECT_DIR$/AufgabenBlatt8/AufgabenBlatt8.iml" />
<module fileurl="file://$PROJECT_DIR$/AufgabenBlatt9/AufgabenBlatt9.iml" filepath="$PROJECT_DIR$/AufgabenBlatt9/AufgabenBlatt9.iml" />
<module fileurl="file://$PROJECT_DIR$/GregorianischerKalender/GregorianischerKalender.iml" filepath="$PROJECT_DIR$/GregorianischerKalender/GregorianischerKalender.iml" /> <module fileurl="file://$PROJECT_DIR$/GregorianischerKalender/GregorianischerKalender.iml" filepath="$PROJECT_DIR$/GregorianischerKalender/GregorianischerKalender.iml" />
<module fileurl="file://$PROJECT_DIR$/.idea/Java-Programming.iml" filepath="$PROJECT_DIR$/.idea/Java-Programming.iml" /> <module fileurl="file://$PROJECT_DIR$/.idea/Java-Programming.iml" filepath="$PROJECT_DIR$/.idea/Java-Programming.iml" />
</modules> </modules>

29
AufgabenBlatt7/.gitignore vendored Normal file
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@ -0,0 +1,29 @@
### IntelliJ IDEA ###
out/
!**/src/main/**/out/
!**/src/test/**/out/
### Eclipse ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
bin/
!**/src/main/**/bin/
!**/src/test/**/bin/
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
### VS Code ###
.vscode/
### Mac OS ###
.DS_Store

21
AufgabenBlatt7/AufgabenBlatt7.iml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="jdk" jdkName="openjdk-19" jdkType="JavaSDK" />
<orderEntry type="sourceFolder" forTests="false" />
<orderEntry type="module-library">
<library name="JUnit4">
<CLASSES>
<root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.13.1/junit-4.13.1.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar!/" />
</CLASSES>
<JAVADOC />
<SOURCES />
</library>
</orderEntry>
</component>
</module>

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AufgabenBlatt7/src/Aufgabe1.java Normal file
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import org.junit.Test;
import java.util.Arrays;
import static org.junit.Assert.assertEquals;
/**
* Generic test class for implementing and testing finding the largest element^ of an integer array
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Aufgabe1 {
/**
* Returns the largest integer value from the supplied array.
* @param array the array to search through
* @return the largest integer value from the supplied array
* @apiNote The largest element is searched in parallel through Stream API.
*/
public static int findLargestThingy(int[] array) {
return Arrays.stream(array).parallel().max().orElseThrow();
}
@Test
public void test() {
final var ARRAY = new int[] {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
};
assertEquals(findLargestThingy(ARRAY), 12);
}
////////////////////////////////
// Task b)
////////////////////////////////
private int[] test;
private int erg;
@Test
public void findeGroesstes() {
test = new int[] { 5, 4, 6, 1 };
erg = 6;
assertEquals(erg, Aufgabe1.findLargestThingy(test));
test = new int[] { 2133231234, 6213123, 1012312, 4353453, 123123127, 4563564 };
erg = test[0];
assertEquals(erg, Aufgabe1.findLargestThingy(test));
}
}

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AufgabenBlatt7/src/Aufgabe2.java Normal file
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import org.junit.Test;
import java.util.Arrays;
import static org.junit.Assert.assertTrue;
/**
* Generic test class for implementing and testing swapping elements of an array
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Aufgabe2 {
/**
* Swap the values of the given indices of the given array
* @param a the array to swap elements of
* @param idx first index
* @param idy second index
*/
private static void swapIndices(int[] a, int idx, int idy) {
var tmp = a[idx];
a[idx] = a[idy];
a[idy] = tmp;
}
@Test
public void test() {
var array = new int[] {1, 2, 3, 4, 5};
swapIndices(array, 0, 1);
swapIndices(array, 1, 2);
swapIndices(array, 2, 0);
swapIndices(array, 4, 2);
assertTrue(Arrays.equals(array, new int[] {1, 3, 5, 4, 2}));
}
}

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AufgabenBlatt7/src/Aufgabe3.java Normal file
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import org.junit.Test;
import static org.junit.Assert.assertEquals;
/**
* Generic test class for implementing and testing a crude round function
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Aufgabe3 {
/**
* Divides the numbers and returns the rounded result
* @param numerator the numerator
* @param denominator the denominator
* @return the rounded result of numerator / denominator
*/
private static double rounded(double numerator, double denominator) {
return Math.floor(numerator / denominator + 0.5);
}
@Test
public void testRoundUp() {
assertEquals(3.0, Aufgabe3.rounded(14.0, 5.0), 0.0);
}
@Test
public void testRoundDown() {
assertEquals(3.0, Aufgabe3.rounded(16.0, 5.0), 0.0);
}
@Test
public void testExact() {
assertEquals(3.0, Aufgabe3.rounded(18.0, 6.0), 0.0);
}
}

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AufgabenBlatt7/src/Aufgabe4.java Normal file
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import org.junit.Test;
import java.util.Scanner;
/**
* Generic test class for implementing and testing the fizzbuzz game
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Aufgabe4 {
/**
* Returns "fizz" if x is divisible by 3
* and "buzz" if x is divisible by 5
* and "fizzbuzz" if x is divisible by 3 and 5
* else return x as string
* @param x the number to play fizzbuzz with
* @return the fizzbuzz string
*/
private static String fizzbuzz(int x) {
var divisibleBy3 = (x % 3) == 0;
var divisibleBy5 = (x % 5) == 0;
if (divisibleBy3 && divisibleBy5) {
return "FizzBuzz";
} else if (divisibleBy3) {
return "Fizz";
} else if (divisibleBy5) {
return "Buzz";
}
return String.valueOf(x);
}
/**
* Play fizz buzz.
* Reads numbers from System.in and prints the according fizzbuzz string.
* @apiNote this function blocks the current thread until 0 is read from System.in
*/
private static void playFizzBuzz() {
try(var scanner = new Scanner(System.in)) {
var number = scanner.nextInt();
if (number == 0) {
return;
}
System.out.println(fizzbuzz(number));
}
}
@Test
public void testFizzBuzz() {
playFizzBuzz();
}
}

29
AufgabenBlatt8/.gitignore vendored Normal file
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@ -0,0 +1,29 @@
### IntelliJ IDEA ###
out/
!**/src/main/**/out/
!**/src/test/**/out/
### Eclipse ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
bin/
!**/src/main/**/bin/
!**/src/test/**/bin/
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
### VS Code ###
.vscode/
### Mac OS ###
.DS_Store

11
AufgabenBlatt8/AufgabenBlatt8.iml Normal file
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@ -0,0 +1,11 @@
<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="jdk" jdkName="openjdk-19" jdkType="JavaSDK" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

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AufgabenBlatt8/src/Aufgabe2.java Normal file
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import javax.swing.*;
/**
* Generic test class for implementing and testing dynamic string arrays
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Aufgabe2 {
/**
* Manages an array of strings.
* Reallocate the array if the size is reached.
*/
private static class DynamicStringArray {
// actual number of elements stored in the array
private int size = 0;
private String[] array = new String[2];
/**
* Adds a new string to the array.
* Reallocate the array if the size is reached.
* @param next the element to append
*/
public void add(String next) {
// test if we need to reallocate
if (array.length == size) {
// temporarily store input strings
String[] inputStringsTemp = array;
// double input strings size
var capacity = array.length * 2;
array = new String[capacity];
// copy original input strings into double sized strings
System.arraycopy(inputStringsTemp, 0, array, 0, size);
}
// store new element into increased array
array[size++] = next;
}
/**
* the number of elements stored
* @return amount of stored strings
*/
public int length() {
return size;
}
/**
* fetch an element at index i
* @param i the index to fetch
* @return the element at index i
*/
public String get(int i) {
return array[i];
}
}
public static void main(String[] args) {
var array = new DynamicStringArray();
while (true) {
String next = JOptionPane.showInputDialog("Naechste Eingabe");
if (next == null)
break;
array.add(next);
}
for (int i = 0; i < array.length(); i++) {
JOptionPane.showMessageDialog(null, array.get(i));
}
}
}

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AufgabenBlatt8/src/aufgabe3/Main.java Normal file
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package aufgabe3;
import javax.swing.*;
import static aufgabe3.UserInterface.*;
public class Main {
public static void main(String[] args) {
var dict = new TelephoneDirectory(10);
while (true) {
String action = getActionDialog("Eintrag anlegen", "Eintrag abfragen");
if (action == null) {
break;
}
if (action.equals("Eintrag anlegen")) {
String[] entryData = getEntryDataDialog();
if (entryData != null) {
dict.addEntry(entryData[0], entryData[1], entryData[2]);
}
} else if (action.equals("Eintrag abfragen")) {
String[] queryData = getQueryDataDialog();
if (queryData != null) {
String nr = dict.findEntry(queryData[0], queryData[1]);
if (nr == null) {
JOptionPane.showMessageDialog(null, "Nicht gefunden");
} else {
JOptionPane.showMessageDialog(null,
"Name: " + queryData[0] + ", Vornane: " + queryData[1] + ", Nummer:" + nr);
}
}
} else {
System.err.println("Fehler: unbekannte Aktion " + action);
break;
}
}
}
}

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AufgabenBlatt8/src/aufgabe3/TelephoneDirectory.java Normal file
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package aufgabe3;
public class TelephoneDirectory {
private int maxSize = 10; // maximale Zahl der Eintraege
private int actSize = 0; // aktuelle Zahl der Eintraege
private String[] name = new String[maxSize]; // alle Namen
private String[] firstName = new String[maxSize]; // alle Vornamen
private String[] number = new String[maxSize]; // alle Nummern
public TelephoneDirectory(int maxSize) {
this.maxSize = maxSize;
this.actSize = 0;
this.name = new String[maxSize];
this.firstName = new String[maxSize];
this.number = new String[maxSize];
}
public String findEntry(String nameP, String firstNameP) {
for (int i = 0; i < actSize; i++) {
if (name[i].equals(nameP) && firstName[i].equals(firstNameP)) {
return number[i];
}
}
return null;
}
public void addEntry(String nameP, String firstNameP, String numberP) {
if (actSize == maxSize) {
System.err.println("Eintrag ignoriert: Speicher voll");
return;
}
for (int i = 0; i < actSize; i++) {
if (name[i].equals(nameP) && firstName[i].equals(firstNameP)) {
System.err.println("Eintrag ignoriert: Existiert schon");
return;
}
}
name[actSize] = nameP;
firstName[actSize] = firstNameP;
number[actSize] = numberP;
actSize = actSize + 1;
}
}

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AufgabenBlatt8/src/aufgabe3/UserInterface.java Normal file
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package aufgabe3;
import javax.swing.*;
public class UserInterface {
static String getActionDialog(String... actions) {
return (String) JOptionPane.showInputDialog(null, "Was soll getan werden?",
"Aktions-Wahl",
JOptionPane.QUESTION_MESSAGE, null, actions, actions[0]);
}
static String[] getEntryDataDialog() {
JTextField nameTF = new JTextField();
JTextField firstNameTF = new JTextField();
JTextField numberTF = new JTextField();
Object[] message = {"Name", nameTF, "Vorname", firstNameTF, "Nummer", numberTF};
Object[] options = {"OK", "Abbruch"};
int n = JOptionPane.showOptionDialog(null, message, "Eintrag anlegen",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (n == JOptionPane.OK_OPTION) { // Zustimmung
return new String[]{nameTF.getText(), firstNameTF.getText(),
numberTF.getText()};
} else if (n == JOptionPane.NO_OPTION // Verneinung
|| n == JOptionPane.CLOSED_OPTION) { // Dialogfenster geschlossen
return null;
} else {
return null;
}
}
static String[] getQueryDataDialog() {
JTextField nameTF = new JTextField();
JTextField firstNameTF = new JTextField();
Object[] message = {"Name", nameTF, "Vorname", firstNameTF};
Object[] options = {"OK", "Abbruch"};
int n = JOptionPane.showOptionDialog(null, message, "Eintrag abfragen",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (n == JOptionPane.OK_OPTION) { // Zustimmung
return new String[]{nameTF.getText(), firstNameTF.getText()};
} else if (n == JOptionPane.NO_OPTION // Verneinung
|| n == JOptionPane.CLOSED_OPTION) { // Dialogfenster geschlossen
return null;
} else {
return null;
}
}
}

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AufgabenBlatt8/src/aufgabe4/Applikation.java Normal file
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package aufgabe4;
import java.util.Calendar;
import java.util.GregorianCalendar;
@SuppressWarnings("unused")
public class Applikation {
public static void main(String[] args) {
var hermes = new Patient("Angela", "Merkel", new GregorianCalendar(1756, Calendar.DECEMBER, 11).getTime());
var peter = new Patient("Christoph", "Bullinger", new GregorianCalendar(2003, Calendar.JANUARY, 31).getTime());
var jano = new Patient("Jano", "Lorang", new GregorianCalendar(1994, Calendar.SEPTEMBER, 14).getTime());
}
}

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AufgabenBlatt8/src/aufgabe4/Patient.java Normal file
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package aufgabe4;
import java.util.Date;
import java.util.random.RandomGenerator;
/**
* Generic test class for implementing a simple patient system for hospitals
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
@SuppressWarnings("unused")
public class Patient {
private final String name;
private final String familyName;
private final Date birthday;
// date the patient was delivered to the hospital
private Date admission;
// date the patient was finished
private Date release;
// universally unique identifier
private long uuid;
/**
* Constructs a new Patient
* @param name the name of the patient
* @param familyName the family name of the patient
* @param birthday the date the patient was born
*/
public Patient(String name, String familyName, Date birthday) {
this.name = name;
this.familyName = familyName;
this.birthday = birthday;
this.admission = new Date();
this.uuid = RandomGenerator.getDefault().nextLong();
}
/**
* Mark the patient as released. Sets the released date to now
*/
public void release() {
this.release = new Date();
}
/**
* Reset the release date to null and set the admission day to now
* the uuid will be regenerated
*/
public void admission() {
this.release = null;
this.admission = new Date();
this.uuid = RandomGenerator.getDefault().nextLong();
}
public String getName() {
return name;
}
public String getFamilyName() {
return familyName;
}
public Date getBirthday() {
return birthday;
}
public Date getAdmission() {
return admission;
}
public Date getRelease() {
return release;
}
public long getUuid() {
return uuid;
}
/**
* returns true if the other object is a patient with equal name and family name else false
* @param obj the other object ot compare to
* @return true if the other object is a patient with equal name and family name else false
*/
@Override
public boolean equals(Object obj) {
if (obj instanceof Patient other) {
return this.name.equals(other.getName()) && this.familyName.equals(other.getFamilyName());
}
return false;
}
@Override
public String toString() {
return String.format("[Patient: %s %s, admission: %s, uuid: %s, released: %s]", name, familyName, admission.toString(), uuid, release.toString());
}
}

29
AufgabenBlatt9/.gitignore vendored Normal file
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@ -0,0 +1,29 @@
### IntelliJ IDEA ###
out/
!**/src/main/**/out/
!**/src/test/**/out/
### Eclipse ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
bin/
!**/src/main/**/bin/
!**/src/test/**/bin/
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
### VS Code ###
.vscode/
### Mac OS ###
.DS_Store

21
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<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="jdk" jdkName="openjdk-19" jdkType="JavaSDK" />
<orderEntry type="sourceFolder" forTests="false" />
<orderEntry type="module-library">
<library name="JUnit4">
<CLASSES>
<root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.13.1/junit-4.13.1.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar!/" />
</CLASSES>
<JAVADOC />
<SOURCES />
</library>
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</component>
</module>

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AufgabenBlatt9/src/Aufgabe3.java Normal file
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import org.junit.Test;
import java.math.BigDecimal;
import java.math.RoundingMode;
import static org.junit.Assert.assertEquals;
/**
* Generic test class for implementing and testing a very basic rational number class
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Aufgabe3 {
/**
* A 64-bit signed rational number. The nominator and denominator are of fixed size of 32-bit.
* Both can be signed. The sign of the number is given by sign(nominator) * sign(denominator)
* Zero can be represented as the nominator being zero and the denominator being anything but 0.
* Since division by 0 is undefined, all rational numbers with a denominator of zero are to be treated as
* invalid numbers.
* @param nominator
* @param denominator
*/
private record Rational(int nominator, int denominator) {
/**
* Construct a rational number. Throws a {@link IllegalArgumentException} exception if the denominator is zero.
* @param nominator the nominator
* @param denominator the denominator (any non-zero value)
* @apiNote nominator and denominator are GCD reduced to avoid overflows
*/
private Rational(int nominator, int denominator) {
if (denominator == 0)
throw new IllegalArgumentException("denominator must be non-negative");
// GCD reduction
var gcd = gcd(denominator, nominator);
this.nominator = nominator / gcd;
this.denominator = denominator / gcd;
}
/**
* compute the greatest common divisor of x and y
*
* @param x the first number to compute the greatest common divisor of
* @param y the second number to compute the greatest common divisor of
* @return the greatest common divisor of x and y
*/
private static int gcd(int x, int y) {
if (y == 0)
return x;
return gcd(y, y % x);
}
/**
* Multiply this number by rhs. Yields the result as a new number
* @param rhs the right hand side of the multiplication
* @return the result of this * rhs
* @apiNote nominator and denominator are GCD reduced to avoid overflows
*/
public Rational multiply(Rational rhs) {
return new Rational(this.nominator * rhs.nominator(), this.denominator * rhs.denominator());
}
/**
* Add this number to rhs. Yields the result as a new number
* @param rhs the right hand side of the sum
* @return the result of this + rhs
* @apiNote nominator and denominator are GCD reduced to avoid overflows
*/
public Rational add(Rational rhs) {
return new Rational(this.nominator * rhs.denominator() + this.denominator * rhs.nominator(), this.denominator * rhs.denominator());
}
/**
* Returns an approximation of the represented number by converting the fraction to BigDecimals and performing
* the conversion to single number by division.
* @param scale the number of digits to approximate
* @return the approximated value as BigDecimal
*/
public BigDecimal toBigDecimal(int scale) {
var nominator = BigDecimal.valueOf(this.nominator, scale);
var denominator = BigDecimal.valueOf(this.denominator, scale);
return nominator.divide(denominator, RoundingMode.HALF_EVEN);
}
}
@Test
public void test() {
var a = new Rational(1, 3);
var b = new Rational(7, 6);
var c = a.add(b).multiply(a);
assertEquals(c.toBigDecimal(10).compareTo(BigDecimal.valueOf(0.5)), 0);
}
}

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AufgabenBlatt9/src/aufgabe4/Receipt.java Normal file
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package aufgabe4;
import java.util.ArrayList;
import java.util.List;
/**
* Generic test class for implementing and testing receipt class
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Receipt {
private final List<ReceiptItem> items = new ArrayList<>();
/**
* Add a new receipt item to the list
* @param item the item to add
*/
public void add(ReceiptItem item) {
this.items.add(item);
}
/**
* Print all receipt items in a linear manner.
*/
public void print() {
System.out.println("""
╔════════════════════════╗
║ SuperShop 042 ║
║ Marchstr. 23 ║
║ 10227 Mannheim ║
║ ☏ 030 314 213 86 ║
╚════════════════════════╝""");
items.forEach(System.out::println);
var total = items.stream().map(a -> a.getPrice() * a.getAmount()).reduce(Double::sum).orElse(0.0);
System.out.format("\n\t\t\t=====\nSumme EUR\t%.2f\n\t\t\t=====", total);
}
public static void main(String[] args) {
var r = new Receipt();
r.add( new ReceiptItem("15 Fischstäbchen", 3, 1.79) );
r.add( new ReceiptItem("Steaks", 5, 3.99) );
r.add( new ReceiptItem("Naturelle (1l)", 6, 4.99) );
r.add( new ReceiptItem("Magnum Eis Creme", 2, 2.99) );
// output receipt in a linear fashion
r.print();
}
}

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AufgabenBlatt9/src/aufgabe4/ReceiptItem.java Normal file
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package aufgabe4;
/**
* Generic test class for implementing and testing receipt item class
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
@SuppressWarnings("unused")
public class ReceiptItem {
private final String name;
private int amount;
private double price;
public ReceiptItem(String name, int amount, double price) {
this.name = name;
this.amount = amount;
this.price = price;
}
/**
* Set the amount
* @param amount a non negative non zero number
*/
public void setAmount(int amount) {
if (amount <= 0) {
throw new IllegalArgumentException("amount must be greater than zero");
}
this.amount = amount;
}
/**
* Set the price
* @param price a non negative non zero number
*/
public void setPrice(double price) {
if (price <= 0) {
throw new IllegalArgumentException("price must be greater than zero");
}
this.price = price;
}
public String getName() {
return name;
}
public int getAmount() {
return amount;
}
public double getPrice() {
return price;
}
@Override
public String toString() {
return String.format("%s\n %sx\t%s€", name, amount, price);
}
}