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Commit c1336b94 authored by Paul Rauser's avatar Paul Rauser
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chore: clean up exercise code and create solid task description

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.gitattributes deleted 100644 → 0
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#
# https://help.github.com/articles/dealing-with-line-endings/
#
# These are explicitly windows files and should use crlf
*.bat text eol=crlf
.project deleted 100644 → 0
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>campus</name>
<comment>Project dormitory created by Buildship.</comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
</natures>
</projectDescription>
README.md 0 → 100644
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# Aufgabenstellung
**Voraussetzung**:
Vorlesung zu ausgewählten Sprachkonstrukten der Sprache Java.
**Ziel**:
Anwendung von `switch-case`-Konstrukten, Aufzählungstypen (Enums) sowie Ausnahmebehandlung.
**Dauer**:
< 2 Stunden
## Aufgabe
Schreiben Sie eine ausführbare Klasse `NextDay`, welche für ein gegebenes Datum (Tag/Monat/Jahr) das Datum des nächsten Tages berechnet und ausgibt.
Programmieren Sie dazu eine Klasse `Date` mit den Attributen Tag, Monat und Jahr. Es soll möglich sein, ein Objekt dieser Klasse durch einen Konstruktor mit genau diesen Parametern (Tag, Monat, Jahr) zu erzeugen.
Die Monate sollen durch Konstanten eines Enums `Month` repräsentiert werden. Die Klasse `Date` soll die Methode `public Date getNextDay()` besitzen, die ein neues Objekt der Klasse `Date` zurückgibt, das den nächsten Tag im Kalender repräsentiert.
Falls versucht wird, ein `Date`-Objekt mit einer fehlerhaften Datumskonstellation (z.B. 32.12.2018) zu erzeugen, soll eine Ausnahme geworfen werden. Dazu erstellen Sie eine eigene Klasse `DateException`, die von `java.lang.Exception` erbt.
Berücksichtigen Sie bei der Berechnung auch Schaltjahre:
- Ein Jahr ist ein Schaltjahr, wenn es durch 4, aber nicht zugleich durch 100 teilbar ist.
- Ist das Jahr durch 400 teilbar, ist es dennoch ein Schaltjahr.
Überlegen Sie, welche weiteren (evtl. privaten) Methoden zur Berechnung des Folgetages benötigt werden.
Die Klasse `NextDay` erzeugt ein `Date`-Objekt für ein gegebenes Datum (z.B. 12.12.2004), gibt dieses auf der Standardausgabe aus, ruft die Methode `getNextDay()` auf diesem Objekt auf und gibt das resultierende Objekt ebenfalls auf der Standardausgabe aus. Die Ausgabe der Klasse sollte wie folgt aussehen:
```
Old date: 12.12.2024
New date: 13.12.2024
```
build.gradle deleted 100644 → 0
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/*
* This file was generated by the Gradle 'init' task.
*
* This generated file contains a sample Java project to get you started.
* For more details take a look at the Java Quickstart chapter in the Gradle
* User Manual available at https://docs.gradle.org/6.3/userguide/tutorial_java_projects.html
*/
plugins {
// Apply the java plugin to add support for Java
id 'java'
// Apply the application plugin to add support for building a CLI application.
id 'application'
}
repositories {
// Use jcenter for resolving dependencies.
// You can declare any Maven/Ivy/file repository here.
jcenter()
}
dependencies {
// This dependency is used by the application.
implementation 'com.google.guava:guava:28.2-jre'
// Use JUnit Jupiter API for testing.
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
// Use JUnit Jupiter Engine for testing.
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.6.0'
}
application {
// Define the main class for the application.
mainClassName = 'io.fp.nextday.App'
}
test {
// Use junit platform for unit tests
useJUnitPlatform()
}
gradle/wrapper/gradle-wrapper.jar deleted 100644 → 0
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File deleted
gradle/wrapper/gradle-wrapper.properties deleted 100644 → 0
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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
gradlew deleted 100644 → 0
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#!/usr/bin/env sh
#
# Copyright 2015 the original author or 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.
#
##############################################################################
##
## Gradle start up script for UN*X
##
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : '.*-> \(.*\)$'`
if expr "$link" : '/.*' > /dev/null; then
PRG="$link"
else
PRG=`dirname "$PRG"`"/$link"
fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/" >/dev/null
APP_HOME="`pwd -P`"
cd "$SAVED" >/dev/null
APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"
warn () {
echo "$*"
}
die () {
echo
echo "$*"
echo
exit 1
}
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "`uname`" in
CYGWIN* )
cygwin=true
;;
Darwin* )
darwin=true
;;
MINGW* )
msys=true
;;
NONSTOP* )
nonstop=true
;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# 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: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD="java"
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
MAX_FD_LIMIT=`ulimit -H -n`
if [ $? -eq 0 ] ; then
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
MAX_FD="$MAX_FD_LIMIT"
fi
ulimit -n $MAX_FD
if [ $? -ne 0 ] ; then
warn "Could not set maximum file descriptor limit: $MAX_FD"
fi
else
warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
fi
fi
# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi
# For Cygwin or MSYS, switch paths to Windows format before running java
if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
APP_HOME=`cygpath --path --mixed "$APP_HOME"`
CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
JAVACMD=`cygpath --unix "$JAVACMD"`
# We build the pattern for arguments to be converted via cygpath
ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
SEP=""
for dir in $ROOTDIRSRAW ; do
ROOTDIRS="$ROOTDIRS$SEP$dir"
SEP="|"
done
OURCYGPATTERN="(^($ROOTDIRS))"
# Add a user-defined pattern to the cygpath arguments
if [ "$GRADLE_CYGPATTERN" != "" ] ; then
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
fi
# Now convert the arguments - kludge to limit ourselves to /bin/sh
i=0
for arg in "$@" ; do
CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
else
eval `echo args$i`="\"$arg\""
fi
i=`expr $i + 1`
done
case $i in
0) set -- ;;
1) set -- "$args0" ;;
2) set -- "$args0" "$args1" ;;
3) set -- "$args0" "$args1" "$args2" ;;
4) set -- "$args0" "$args1" "$args2" "$args3" ;;
5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
esac
fi
# Escape application args
save () {
for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
echo " "
}
APP_ARGS=`save "$@"`
# Collect all arguments for the java command, following the shell quoting and substitution rules
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
exec "$JAVACMD" "$@"
gradlew.bat deleted 100644 → 0
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@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
@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=.
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%" == "0" goto init
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto init
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:init
@rem Get command-line arguments, handling Windows variants
if not "%OS%" == "Windows_NT" goto win9xME_args
:win9xME_args
@rem Slurp the command line arguments.
set CMD_LINE_ARGS=
set _SKIP=2
:win9xME_args_slurp
if "x%~1" == "x" goto execute
set CMD_LINE_ARGS=%*
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="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!
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega
settings.gradle deleted 100644 → 0
+ 0
− 10
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/*
* This file was generated by the Gradle 'init' task.
*
* The settings file is used to specify which projects to include in your build.
*
* Detailed information about configuring a multi-project build in Gradle can be found
* in the user manual at https://docs.gradle.org/6.3/userguide/multi_project_builds.html
*/
rootProject.name = 'campus'
src/main/java/io/fp/nextday/App.java deleted 100644 → 0
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package io.fp.nextday;
public class App {
public static void main(String[] args) throws DateException {
Date date = new Date(31, Month.DECEMBER, 2020);
System.out.println("Altes Datum: " + date );
Date newdate = date.getNextDay();
System.out.println("Neues Datum: " + newdate);
}
}
src/main/java/io/fp/nextday/DateException.java deleted 100644 → 0
+ 0
− 26
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package io.fp.nextday;
public class DateException extends Exception {
private static final long serialVersionUID = 1L;
public DateException() {
super("Fehlerhaftes Datum!");
}
public DateException(String errorDescription) {
super(errorDescription);
}
public DateException(Throwable cause) {
super(cause);
}
public DateException(String message, Throwable cause) {
super(message, cause);
}
public DateException(String message, Throwable cause, boolean arg2, boolean arg3) {
super(message, cause, arg2, arg3);
}
}
src/main/java/io/fp/nextday/Date.java → src/nextday/Date.java
+ 24
− 37
View file @ c1336b94
package io.fp.nextday;
package nextday;
public class Date {
private int day;
private Month month;
private int year;
......@@ -14,7 +13,6 @@ public class Date {
}
public Date getNextDay() {
try {
Date newDate = new Date(day, month, year);
......@@ -40,6 +38,7 @@ public class Date {
newDate.setMonth(month.getNextMonth());
return newDate;
}
if (day == 31) {
newDate.setDay(1);
if (month == Month.DECEMBER) {
......@@ -51,9 +50,11 @@ public class Date {
return newDate;
}
newDate.setDay(day + 1);
return newDate;
} catch (DateException e) {
throw new RuntimeException("Wow, this should have been impossible! Either the algorithm is wrong or the validation is buggy!");
throw new RuntimeException("If this is thrown that either means your algorithm or your validation is buggy.");
}
}
......@@ -68,7 +69,6 @@ public class Date {
}
private boolean isLongMonth(Month month) {
switch (month) {
case FEBRUARY:
case APRIL:
......@@ -80,56 +80,43 @@ public class Date {
return true;
}
}
private void validateDate(int day, Month month, int year) throws DateException {
if(day>31 || day<1){
if(day > 31 || day < 1){
throw new DateException("Invalid day.");
}
if(year<0){
if(year < 0){
throw new DateException("Invalid year.");
}
if(!isLongMonth(month) & day>30){
if(!isLongMonth(month) & day > 30){
throw new DateException("Invalid day in month.");
}
if(!isLeapYear(year) & day>28 & month == Month.FEBRUARY){
if(!isLeapYear(year) & day > 28 & month == Month.FEBRUARY){
throw new DateException("Invalid day in month.");
}
if(isLeapYear(year) & day>29 & month == Month.FEBRUARY){
if(isLeapYear(year) & day > 29 & month == Month.FEBRUARY){
throw new DateException("Invalid day in month.");
}
}
public String toString(){
return day + "." + month + "." + year;
}
public int getDay() {
return day;
}
private void setMonth(Month month) {
this.month = month;
}
public void setDay(int day) throws DateException {
validateDate(day, month, year);
this.day = day;
}
public Month getMonth() {
return month;
}
public void setMonth(Month month) throws DateException {
validateDate(day, month, year);
this.month = month;
}
private void setDay(int day) {
this.day = day;
}
public int getYear() {
return year;
}
private void setYear(int year) {
this.year = year;
}
public void setYear(int year) throws DateException {
validateDate(day, month, year);
this.year = year;
}
@Override
public String toString() {
return "" + this.day + "." + (this.month.ordinal() + 1) + "." + this.year;
}
}
src/nextday/DateException.java 0 → 100644
+ 11
− 0
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package nextday;
public class DateException extends Exception {
public DateException() {
super("The specified date is invalid!");
}
public DateException(String errorDescription) {
super(errorDescription);
}
}
src/main/java/io/fp/nextday/Month.java → src/nextday/Month.java
+ 2
− 3
View file @ c1336b94
package io.fp.nextday;
package nextday;
public enum Month {
JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, AUGUST, SEPTEMBER, OCTOBER,
NOVEMBER, DECEMBER;
public Month getNextMonth() {
return values()[(ordinal() +1) % values().length];
return values()[(ordinal() + 1) % values().length];
}
}
src/nextday/NextDay.java 0 → 100644
+ 10
− 0
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package nextday;
public class NextDay {
public static void main(String[] args) throws DateException {
Date date = new Date(31, Month.DECEMBER, 2024);
System.out.println("Old date: " + date);
Date newDate = date.getNextDay();
System.out.println("New date: " + newDate);
}
}
src/test/java/io/fp/nextday/DateTest.java deleted 100644 → 0
+ 0
− 29
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package io.fp.nextday;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
public class DateTest {
Date date;
@BeforeEach
void setUp() throws DateException {
date = new Date(31, Month.DECEMBER, 2020);
}
@Test
void testNextDay() {
date = date.getNextDay();
assertTrue(date.getDay()== 1 && date.getMonth() == Month.JANUARY && date.getYear() == 2021);
}
}
\ No newline at end of file
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