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Sven Vogel 2023-04-21 12:39:35 +02:00
parent 09266228ab
commit 32ba8f6958
11 changed files with 237 additions and 27 deletions
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2
.idea/modules.xml
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@ -3,7 +3,7 @@
<component name="ProjectModuleManager">
<modules>
<module fileurl="file://$PROJECT_DIR$/GgtUndKgv/GgtUndKgv.iml" filepath="$PROJECT_DIR$/GgtUndKgv/GgtUndKgv.iml" />
<module fileurl="file://$PROJECT_DIR$/GreogorianischerKalender/GreogorianischerKalender.iml" filepath="$PROJECT_DIR$/GreogorianischerKalender/GreogorianischerKalender.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://$PROJECT_DIR$/Konto/Konto.iml" filepath="$PROJECT_DIR$/Konto/Konto.iml" />
<module fileurl="file://$PROJECT_DIR$/Maximum/Maximum.iml" filepath="$PROJECT_DIR$/Maximum/Maximum.iml" />

44
GgtUndKgv/src/Main.java
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@ -1,18 +1,58 @@
import javax.swing.*;
/**
* Generic test class for implementing
* ggt and kgv
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
class Rechnen {
static int ggt(int x, int y) {
/**
* 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
*/
public static int ggt(int x, int y) {
if (x == 0)
return y;
return ggt(x, y % x);
}
static int kgv(int x, int y) {
/**
* compute the smallest common multiple of x and y
* @param x the first number to compute the smallest common multiple of
* @param y the second number to compute the smallest common multiple of
* @return the smallest common multiple of x and y
*/
public static int kgv(int x, int y) {
return (x * y) / ggt(x, y);
}
}
/**
* Generic test class for testing
* kgv and ggt
* <p>
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
* <p>
* NOTE: following code mostly copied from the teacher,
* expect no comments or functionality
*/
public class Main {
public static void main(String[] args) {

0
GreogorianischerKalender/.gitignore → GregorianischerKalender/.gitignore vendored
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0
GreogorianischerKalender/GreogorianischerKalender.iml → GregorianischerKalender/GregorianischerKalender.iml
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38
GregorianischerKalender/src/Main.java Normal file
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@ -0,0 +1,38 @@
/**
* Generic test class for implementing and testing
* for leap years according to the gregorian calendar
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Main {
/**
* Test whether the supplied year is a leap year according to the gregorian calendar
* @apiNote also works with negative numbers
* @param year the year to test
* @return if the year is a leap year
*/
private static boolean isLeapYearGregorianCalendar(int year) {
int decade = year / 10;
return decade % 4 != 0;
}
public static void main(String[] args) {
System.out.println("is leap year: 1904: " + isLeapYearGregorianCalendar(1904));
System.out.println("is leap year: 1003: " + isLeapYearGregorianCalendar(1003));
System.out.println("is leap year: 1422: " + isLeapYearGregorianCalendar(1422));
System.out.println("is leap year: 2022: " + isLeapYearGregorianCalendar(2022));
}
}

14
GreogorianischerKalender/src/Main.java
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@ -1,14 +0,0 @@
public class Main {
private static boolean isLeapYearGregorianCalendar(int year) {
int decade = year / 10;
return decade % 4 != 0;
}
public static void main(String[] args) {
System.out.println("is leap year: 1904: " + isLeapYearGregorianCalendar(1904));
System.out.println("is leap year: 1003: " + isLeapYearGregorianCalendar(1003));
System.out.println("is leap year: 1422: " + isLeapYearGregorianCalendar(1422));
System.out.println("is leap year: 2022: " + isLeapYearGregorianCalendar(2022));
}
}

45
Konto/src/Konto.java
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@ -1,8 +1,33 @@
/**
* Generic test class for implementing and testing
* a basic Konto
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Konto {
private double guthaben;
void abheben(double betrag) {
/**
* Get some money from the konto.
* If the betrag is less than the money contained by the konto,
* then the maximum possible amount is taken from the konto and a message is printed
* to System.out
* @param betrag the amount of money to get out of the konto
*/
public void abheben(double betrag) {
var neuesGuthaben = guthaben - betrag;
if (neuesGuthaben < 0) {
System.out.println("Sie konnten nur " + guthaben + " abheben");
@ -12,15 +37,23 @@ public class Konto {
guthaben = neuesGuthaben;
}
void einzahlen(double betrag) {
/**
* Put some money in the konto.
* @exception IllegalArgumentException When betrag is negative
* @param betrag the amount of money to add to the konto
*/
public void einzahlen(double betrag) {
if (betrag < 0) {
System.err.println("no");
return;
throw new IllegalArgumentException("Man kann keinen negativen Betrag einzahlen");
}
this.guthaben += betrag;
}
double getGuthaben() {
/**
* Get the amount of memory in the konto
* @return the amount of memory in the konto
*/
public double getGuthaben() {
return guthaben;
}
@ -29,7 +62,7 @@ public class Konto {
konto.einzahlen(134);
konto.einzahlen(0.345);
System.out.println("guthaben: " + konto.getGuthaben());
System.out.println("Guthaben: " + konto.getGuthaben());
konto.abheben(1e6);
}
}

45
Maximum/src/Main.java
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@ -1,19 +1,58 @@
/**
* Generic test class for implementing and testing
* custom minimum and maximum methods
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Main {
static int max(int a, int b) {
/**
* compute the maximum of a and b
* @apiNote prints the result ot System.out
* @param a the first value to compute the maximum of
* @param b the second value to compute the maximum of
* @return the maximum of the two values
*/
private static int max(int a, int b) {
int max = a > b ? a : b;
System.out.println("max: " + max);
return max;
}
static int max(int a, int b, int c) {
/**
* Compute the maximum of a and b
* @param a the first value to compute the maximum of
* @param b the second value to compute the maximum of
* @param c the third value to compute the maximum of
* @return the maximum of the values
*/
private static int max(int a, int b, int c) {
if (a < b) {
return b > c ? c : a;
}
return a > c ? a : c;
}
static double max(double a, double b, double c) {
/**
* Compute the minimum of a and b
* @param a the first value to compute the minimum of
* @param b the second value to compute the minimum of
* @param c the third value to compute the minimum of
* @return the minimum of the values
*/
private static double max(double a, double b, double c) {
if (a < b) {
return b > c ? c : a;
}

6
README.md
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@ -1,2 +1,8 @@
# Java-Programming
This repository contains most of the exercises from the Java course at the DHBW.
Most of the projects found in this repository must be compiled with at least Java version 11, due to features
being used such as the `var` keyword or pattern matching.
No projects utilize external dependencies not supplied by at least the Adopt OpenJDK.
The IDE used to write, test and execute the projects was Intellij-IDEA.
Therefore the projects have no direct compatibility with Eclipse.

49
Verzinsung/src/Main.java
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@ -1,10 +1,39 @@
import javax.swing.*;
/**
* Generic test class for implementing and testing
* custom minimum and maximum methods
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*/
public class Main {
static double linearZins(double kp, double zs, int n) {
/**
* calculate the linear zins over a span of years
* @param kp kaptial to invest at the beginning
* @param zs zinssatz or the amount of increase in normalized percentage [0; 1]
* @param n number of years to calculate
* @return the total amount of money
*/
private static double linearZins(double kp, double zs, int n) {
double k = kp;
if (n < 0) {
throw new IllegalArgumentException("years must not be negative");
}
for (int i = 0; i < n; i++) {
k += kp * zs;
}
@ -12,9 +41,20 @@ public class Main {
return k;
}
/**
* calculate the exponetial zins over a span of years
* @param kp kaptial to invest at the beginning
* @param zs zinssatz or the amount of increase in normalized percentage [0; 1]
* @param n number of years to calculate
* @return the total amount of money
*/
static double expZins(double kp, double zs, int n) {
double k = kp;
if (n < 0) {
throw new IllegalArgumentException("years must not be negative");
}
for (int i = 0; i < n; i++) {
k += k * zs;
}
@ -22,6 +62,13 @@ public class Main {
return k;
}
/**
* Opens system dialog requesting the user to enter a string.
* Ths string gets converted to a double and tested for its sign.
* If the input is invalid, i.e. not a unsigned rational number, the popup will appear again.
* @param message the message to be displayed
* @return the user input
*/
static double enterUnsigendDouble(String message) {
while (true) {
try {

21
Zaubern/src/Main.java
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@ -1,5 +1,26 @@
import java.util.Random;
/**
* Generic test class for implementing and testing
* custom minimum and maximum methods
* _ _ _ _
* __ ___ __(_) |_| |_ ___ _ __ | |__ _ _
* \ \ /\ / / '__| | __| __/ _ \ '_ \ | '_ \| | | |
* \ V V /| | | | |_| || __/ | | | | |_) | |_| |
* \_/\_/ |_| |_|\__|\__\___|_| |_| |_.__/ \__, |
* |___/
* ____ __ __ _
* / ___|_ _____ _ __ \ \ / /__ __ _ ___| |
* \___ \ \ / / _ \ '_ \ \ \ / / _ \ / _` |/ _ \ |
* ___) \ V / __/ | | | \ V / (_) | (_| | __/ |
* |____/ \_/ \___|_| |_| \_/ \___/ \__, |\___|_|
* |___/
* Licensed under the GPLv2 License, Version 2.0 (the "License");
* Copyright (c) Sven Vogel
*
* NOTE: following code mostly copied from the teacher,
* expect no comments or functionality
*/
public class Main {
enum Zauberspruch {