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fabianArbeit 2024-08-05 14:33:49 +02:00
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149
Darlehenberechner.java Normal file
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import java.text.DecimalFormat;
import java.math.BigDecimal;
import java.math.MathContext;
import java.time.Month;
import java.time.YearMonth;
class Darlehenberechner {
private static final class Konfiguration {
private BigDecimal darlehenswert;
private BigDecimal zinssatzProzent;
private BigDecimal monatlicheRate;
private Integer laufzeitJahre;
private Integer tilgungsfreieZeit;
private YearMonth anfangsmonat;
public BigDecimal getDarlehenswert() {
return darlehenswert;
}
public Konfiguration setDarlehenswert(BigDecimal darlehenswert) {
this.darlehenswert = darlehenswert;
return this;
}
public BigDecimal getZinssatzProzent() {
return zinssatzProzent;
}
public Konfiguration setZinssatzProzent(BigDecimal zinssatzProzent) {
this.zinssatzProzent = zinssatzProzent;
return this;
}
public BigDecimal getMonatlicheRate() {
return monatlicheRate;
}
public Konfiguration setMonatlicheRate(BigDecimal monatlicheRate) {
this.monatlicheRate = monatlicheRate;
return this;
}
public Integer getLaufzeitJahre() {
return laufzeitJahre;
}
public Konfiguration setLaufzeitJahre(Integer laufzeitJahre) {
this.laufzeitJahre = laufzeitJahre;
return this;
}
public Integer getTilgungsfreieZeit() {
return tilgungsfreieZeit;
}
public Konfiguration setTilgungsfreieZeit(Integer tilgungsfreieZeit) {
this.tilgungsfreieZeit = tilgungsfreieZeit;
return this;
}
public YearMonth getAnfangsmonat() {
return anfangsmonat;
}
public Konfiguration setAnfangsmonat(YearMonth anfangsmonat) {
this.anfangsmonat = anfangsmonat;
return this;
}
}
private static final DecimalFormat DECIMAL_FORMAT = new DecimalFormat("#,##0.00");
private static final BigDecimal ZWOELF = BigDecimal.valueOf(12);
public static void main(String[] args) {
var konfig = new Konfiguration()
.setDarlehenswert(BigDecimal.valueOf(168_000))
.setZinssatzProzent(BigDecimal.valueOf(3.73))
.setMonatlicheRate(BigDecimal.valueOf(1_500))
.setTilgungsfreieZeit(0)
.setAnfangsmonat(YearMonth.of(2024, Month.SEPTEMBER));
berechneWerte(konfig);
/*var konfig = new Konfiguration()
.setDarlehenswert(BigDecimal.valueOf(168_000))
.setZinssatzProzent(BigDecimal.valueOf(3.73))
.setMonatlicheRate(BigDecimal.valueOf(1_500))
.setTilgungsfreieZeit(0)
.setLaufzeitJahre(11)
.setAnfangsmonat(YearMonth.of(2024, Month.SEPTEMBER));
berechneWerte(konfig);*/
}
private static void berechneWerte(Konfiguration konfig) {
BigDecimal zinssatzReal = konfig.getZinssatzProzent().divide(BigDecimal.valueOf(100), MathContext.DECIMAL128);
BigDecimal monatlicheRate = konfig.getMonatlicheRate();
Integer laufzeitJahre = konfig.getLaufzeitJahre();
Integer tilgungsfreieZeit = konfig.getTilgungsfreieZeit();
BigDecimal restschuld = konfig.getDarlehenswert();
YearMonth aktuellerMonat = konfig.getAnfangsmonat();
BigDecimal summeZinsen = BigDecimal.ZERO;
BigDecimal summeTilgung = BigDecimal.ZERO;
int laufzeitMonate = 0;
while ((laufzeitJahre == null || laufzeitMonate < (laufzeitJahre * 12)) && restschuld.signum() > 0) {
// berechne Beträge/ aktualisiere Restschuld
BigDecimal zinsbetrag = restschuld.multiply(zinssatzReal).divide(ZWOELF, MathContext.DECIMAL128);
if (monatlicheRate.compareTo(restschuld) > 0) {
monatlicheRate = restschuld.add(zinsbetrag); // die letzte Rate ist gleich der Restschuld + Zinsen
}
BigDecimal tilgungsbetrag = tilgungsfreieZeit != null && tilgungsfreieZeit > 0 ? BigDecimal.ZERO : monatlicheRate.subtract(zinsbetrag);
restschuld = restschuld.subtract(tilgungsbetrag);
System.out.println(aktuellerMonat + ": " + DECIMAL_FORMAT.format(monatlicheRate) + " = " + DECIMAL_FORMAT.format(zinsbetrag)
+ " + " + DECIMAL_FORMAT.format(tilgungsbetrag) + " | " + DECIMAL_FORMAT.format(restschuld));
// berechne Summen für Zusammenfassung
summeZinsen = summeZinsen.add(zinsbetrag);
summeTilgung = summeTilgung.add(tilgungsbetrag);
if ((laufzeitMonate > 0 && laufzeitMonate % 11 == 0) || aktuellerMonat.getMonthValue() == 12) {
System.out.println(" " + DECIMAL_FORMAT.format(summeZinsen) + " + " + DECIMAL_FORMAT.format(summeTilgung));
}
// aktualisiere Werte für den nächsten Lauf
aktuellerMonat = aktuellerMonat.plusMonths(1);
laufzeitMonate++;
if (tilgungsfreieZeit != null) {
tilgungsfreieZeit--;
}
}
// letzte Zusammenfassung
System.out.println(" " + DECIMAL_FORMAT.format(summeZinsen) + " + " + DECIMAL_FORMAT.format(summeTilgung));
// Ausgabe Laufzeit + Restschuld
laufzeitJahre = laufzeitJahre == null ? laufzeitMonate / 12 : laufzeitJahre;
int laufzeitMonateTeil = laufzeitMonate - (laufzeitJahre * 12);
System.out.println("Laufzeit: " + laufzeitJahre + " Jahre " + laufzeitMonateTeil + " Monate");
System.out.println("Restschuld: " + DECIMAL_FORMAT.format(restschuld));
}
}

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Java11.java Normal file
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import java.awt.Point;
import java.io.IOException;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
import java.util.function.Predicate;
import java.util.stream.Collectors;
class Java11 {
public static void main(String[] args) {
////////
// 1. //
////////
// if the resource is referenced by a final or effectively final variable,
// a try-with-resources statement can manage a resource without a new variable being declared:
MyAutoCloseable mac = new MyAutoCloseable();
try (mac) {
// do some stuff with mac
}
////////
// 2. //
////////
// use diamond operator in conjunction with anonymous inner classes
List<Integer> fc = new ArrayList<>(1) {}; // anonymous inner class
List<? extends Integer> fc0 = new ArrayList<>(1) {
// anonymous inner class
};
List<?> fc1 = new ArrayList<>(1) {}; // anonymous inner class
////////
// 4. //
////////
// Local Variable Type Inference
var message = "Hello, Java 10";
var point = new Point(1, 2);
////////
// 5. //
////////
// immutable Collections/ Maps
Map<String, Integer> meineMap = Map.of();
Set<String> meinSet = Set.of("key1", "key2", "key3");
List<String> meineListe = List.copyOf(meinSet);
////////
// 6. //
////////
// Optional to Stream Optional.stream() gives us an easy way to you use the power of Streams on Optional elements
List<String> filteredList = new ArrayList<Optional<String>>().stream()
.flatMap(Optional::stream)
.collect(Collectors.toList());
////////
// 7. //
////////
// Collectors get additional methods to collect a Stream into unmodifiable List, Map or Set:
List<Integer> evenList = new ArrayList<Integer>().stream()
.filter(i -> i % 2 == 0)
.collect(Collectors.toUnmodifiableList());
////////
// 8. //
////////
// Optional got a new method orElseThrow() which doesn’t take any argument and throws NoSuchElementException if no value is present:
Integer firstEven = List.of(1, 2, 3).stream()
.filter(i -> i % 2 == 0)
.findFirst()
.orElseThrow();
////////
// 9. //
////////
// Java 11 adds a few new methods to the String class
var multilineString = "Baeldung helps \n \n developers \n explore Java.";
List<String> lines = multilineString.lines().collect(Collectors.toList());
assert " ".isBlank();
assert " x ".strip().equals("x");
assert " x ".stripLeading().equals("x ");
assert " x ".stripTrailing().equals(" x");
assert "x".repeat(5).equals("xxxxx");
/////////
// 10. //
/////////
// We can use the new readString and writeString static methods from the Files class:
String fileContent = null;
try {
Path filePath = Files.writeString(Files.createTempFile("demo", ".txt"), "Sample text");
fileContent = Files.readString(filePath);
} catch (IOException ioe) {}
assert fileContent.equals("Sample text");
/////////
// 11. //
/////////
// The java.util.Collection interface contains a new default toArray method which takes an IntFunction argument.
List<String> sampleList = List.of("Java", "Kotlin");
String[] sampleArray = sampleList.toArray(String[]::new);
/////////
// 12. //
/////////
// A static not method has been added to the Predicate interface.
sampleList = List.of("Java", "\n \n", "Kotlin", " ");
List<String> withoutBlanks = sampleList.stream()
.filter(Predicate.not(String::isBlank))
.collect(Collectors.toList());
// While not(isBlank) reads more naturally than isBlank.negate(), the big advantage is that we can also use not with method references,
// like not(String::isBlank).
/////////
// 13. //
/////////
// Support for using the local variable syntax (var keyword) in lambda parameters was added in Java 11.
// We can make use of this feature to apply modifiers to our local variables, like defining a type annotation:
sampleList = List.of("Java", "Kotlin");
String resultString = sampleList.stream()
.map((@Nonnull var x) -> x.toUpperCase())
.collect(Collectors.joining(", "));
assert resultString.equals("JAVA, KOTLIN");
}
}
class MyAutoCloseable implements AutoCloseable {
public void close() {}
}
////////
// 3. //
////////
// Interfaces in the upcoming JVM version can have private methods, which can be used to split lengthy default methods
interface InterfaceWithPrivateMethods {
private static String staticPrivate() {
return "static private";
}
private String instancePrivate() {
return "instance private";
}
default void check() {
String result = staticPrivate();
InterfaceWithPrivateMethods pvt = new InterfaceWithPrivateMethods() {
// anonymous class
};
result = pvt.instancePrivate();
}
}
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.PARAMETER)
public @interface Nonnull {}

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import java.text.DecimalFormat;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
class LoadingBar {
private static final String TIME_FORMAT = "HH:mm";
private static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern(TIME_FORMAT);
private static final Pattern TIME_PATTERN = Pattern.compile("(?>[01][0-9]|2[0-4]):[0-5][0-9]");
private static final Pattern LUNCH_DURATION_PATTERN = Pattern.compile("\\d+");
private static final Pattern OFFSET_PATTERN = Pattern.compile("[\\+\\-]\\d+");
private static final DecimalFormat PERCENTAGE_FORMAT = new DecimalFormat("00.00");
private static final int MIN_LUNCH_DURATION = 30;
private static final LocalTime LATEST_LUNCH_TIME = LocalTime.of(13, 30);
private static final int DEFAULT_NUMBER_WORK_MINS_BEFORE_LUNCH = 5 * 60;
private static final int MAX_NUMBER_WORK_MINS_WITHOUT_LUNCH = 6 * 60;
private static final int MAX_NUMBER_WORK_MINS = 8 * 60;
private static enum DaySection {
MITTAG("-m", "Mittag"),
ZAPFENSTREICH("-z", "Zapfenstreich");
private final String param;
private final String description;
private DaySection(String param, String description) {
this.param = param;
this.description = description;
}
public static DaySection byParam(String param) {
return Arrays.stream(DaySection.values()).filter((DaySection section) -> section.getParam().equals(param)).findFirst().orElse(null);
}
public String getParam() {
return param;
}
public String getDescription() {
return description;
}
}
public static void main(String[] args) {
if (args.length > 0 && Objects.equals(args[0], "--help")) {
printHelp();
return;
}
verifyMinimumNumberOfArgs(args);
String nextArg = args[0];
verifyTimeFormat(nextArg, "Erstes Argument");
var startTime = LocalTime.parse(nextArg, TIME_FORMATTER);
nextArg = args[1];
var section = DaySection.byParam(nextArg);
verifyDaySection(section, nextArg);
if (section == DaySection.MITTAG) {
handleMittagspause(args, startTime);
} else {
handleZapfenstreich(args, startTime);
}
}
private static void handleMittagspause(String[] args, LocalTime startTime) {
if (args.length == 2) {
showLoadingBarMittagspause(startTime);
return;
}
String nextArg = args[2];
verifyTimeFormat(nextArg, "Argument nach " + DaySection.MITTAG.getParam());
var maxMittagspause = LocalTime.parse(nextArg, TIME_FORMATTER);
showLoadingBarMittagspause(startTime, maxMittagspause);
}
private static void handleZapfenstreich(String[] args, LocalTime startTime) {
Integer lunchDuration = null;
if (args.length == 2) {
showLoadingBarZapfenstreich(startTime, lunchDuration);
return;
}
String nextArg = args[2];
LocalTime maxZapfenstreich = null;
int endTimeOffset = 0;
if (TIME_PATTERN.matcher(nextArg).matches()) {
maxZapfenstreich = LocalTime.parse(nextArg, TIME_FORMATTER);
} else if (OFFSET_PATTERN.matcher(nextArg).matches()) {
endTimeOffset = Integer.parseInt(nextArg);
} else {
verifyDurationFormat(nextArg, "Argument nach " + DaySection.ZAPFENSTREICH.getParam(), true); // FSFIXME erweitere Fehlermeldung
lunchDuration = Integer.parseInt(nextArg);
}
if (args.length == 3) {
if (maxZapfenstreich == null && endTimeOffset == 0) {
showLoadingBarZapfenstreich(startTime, lunchDuration);
} else if (maxZapfenstreich == null) {
showLoadingBarZapfenstreich(startTime, lunchDuration, endTimeOffset);
} else {
showLoadingBarZapfenstreich(startTime, lunchDuration, maxZapfenstreich);
}
return;
}
nextArg = args[3];
if (lunchDuration == null) {
System.out.println("Letztes Argument darf nur auf Mittagspausendauer folgen.");
System.exit(1);
}
if (maxZapfenstreich == null && !OFFSET_PATTERN.matcher(nextArg).matches()) {
verifyTimeFormat(nextArg, "Letztes Argument nach " + DaySection.ZAPFENSTREICH.getParam() + " und Mittagspausendauer");
maxZapfenstreich = LocalTime.parse(nextArg, TIME_FORMATTER);
showLoadingBarZapfenstreich(startTime, lunchDuration, maxZapfenstreich);
return;
}
verifyOffsetFormat(nextArg, "Letztes Argument nach " + DaySection.ZAPFENSTREICH.getParam() + " und Enduhrzeit");
endTimeOffset = Integer.parseInt(nextArg);
showLoadingBarZapfenstreich(startTime, lunchDuration, endTimeOffset);
}
private static void verifyMinimumNumberOfArgs(String[] args) {
if (args.length >= 2) {
return;
}
System.out.println("Mindestens 2 Argumente müssen gegeben sein.");
printHelp();
System.exit(1);
}
private static void verifyTimeFormat(String param, String errMsgPrefix) {
verifyInputFormat(TIME_PATTERN, param, errMsgPrefix, true, false);
}
private static void verifyDurationFormat(String param, String errMsgPrefix, boolean timeInputPossible) {
verifyInputFormat(LUNCH_DURATION_PATTERN, param, errMsgPrefix, false, timeInputPossible);
}
private static void verifyOffsetFormat(String param, String errMsgPrefix) {
verifyInputFormat(OFFSET_PATTERN, param, errMsgPrefix, false, false);
}
private static void verifyInputFormat(Pattern pattern, String param, String errMsgPrefix, boolean timeInput, boolean timeInputPossible) {
if (pattern.matcher(param).matches()) {
return;
} // FSFIXME fine tune message -> HH:mm, mm, -+mm
var firstInputPart = timeInput ? "Uhrzeitformat ("+ TIME_FORMAT + ")" : "Minutenanzahl (" + LUNCH_DURATION_PATTERN + ")";
var possibleTimeInputPart = !timeInput && timeInputPossible ? " oder Uhrzeitformat ("+ TIME_FORMAT + ")" : "";
System.out.println(errMsgPrefix + " \"" + param + "\" muss " + firstInputPart + possibleTimeInputPart + " entsprechen.");
System.exit(1);
}
private static void verifyDaySection(DaySection section, String param) {
if (section != null) {
return;
}
List<String> sectionDescs = Arrays.stream(DaySection.values()).map((DaySection ds) -> ds.getDescription() + " (" + ds.getParam() + ")")
.collect(Collectors.toList());
String sectionDescsJoined = String.join(" oder ", sectionDescs);
System.out.println("Argument nach Startzeit \"" + param + "\" muss Angabe für " + sectionDescsJoined + " sein.");
System.exit(1);
}
private static void printHelp() {
System.out.println(new StringBuilder().append("Mögliche Argumente für LoadingBar:\n")
.append("Normalfall Vormittag (Mittagspause <= ").append(LATEST_LUNCH_TIME).append(")\n")
.append(TIME_FORMAT).append(" ").append(DaySection.MITTAG.getParam()).append("\n")
.append("Vormittag mit expliziter Mittagspause (<= ").append(LATEST_LUNCH_TIME).append(")\n")
.append(TIME_FORMAT).append(" ").append(DaySection.MITTAG.getParam()).append(" ").append(TIME_FORMAT).append("\n")
.append("Normalfall Nachmittag (Mittagspause ").append(MIN_LUNCH_DURATION).append(" min)\n")
.append(TIME_FORMAT).append(" ").append(DaySection.ZAPFENSTREICH.getParam()).append("\n")
.append("Nachmittag mit expliziter Länge Mittagspause (Mittagspause unter ").append(MIN_LUNCH_DURATION).append(" min wird auf ").append(MIN_LUNCH_DURATION).append(" min korrigiert)\n")
.append(TIME_FORMAT).append(" ").append(DaySection.ZAPFENSTREICH.getParam()).append(" mm\n")
.append("Nachmittag mit explizitem Feierabend (Mittagspause je nach Minimum (s.u.))\n")
.append(TIME_FORMAT).append(" ").append(DaySection.ZAPFENSTREICH.getParam()).append(" ").append(TIME_FORMAT).append("\n")
.append("Nachmittag mit abweichender Minutenanzahl Arbeitszeit\n")
.append(TIME_FORMAT).append(" ").append(DaySection.ZAPFENSTREICH.getParam()).append(" -+mm\n")
.append("Nachmittag mit explizitem Feierabend u. expliziter Länge Mittagspause (Mittagspause unter Minimum (s.u.) wird auf Minimum korrigiert)\n")
.append(TIME_FORMAT).append(" ").append(DaySection.ZAPFENSTREICH.getParam()).append(" mm ").append(TIME_FORMAT).append("\n")
.append("Nachmittag mit explizitem Feierabend u. abweichender Minutenanzahl Arbeitszeit\n")
.append(TIME_FORMAT).append(" ").append(DaySection.ZAPFENSTREICH.getParam()).append(" ").append(TIME_FORMAT).append(" -+mm\n\n")
.append("Mittagspause minimum in Minuten:\n")
.append(" - bis ").append(MAX_NUMBER_WORK_MINS_WITHOUT_LUNCH).append(" min (")
.append(MAX_NUMBER_WORK_MINS_WITHOUT_LUNCH / 60).append(" std): 0\n")
.append(" - bis ").append(MAX_NUMBER_WORK_MINS_WITHOUT_LUNCH).append(" min + ")
.append(MIN_LUNCH_DURATION).append(" min: Arbeitszeit - ").append(MAX_NUMBER_WORK_MINS_WITHOUT_LUNCH).append(" min\n")
.append(" - ab ").append(MAX_NUMBER_WORK_MINS_WITHOUT_LUNCH).append(" min + ").append(MIN_LUNCH_DURATION).append(" min: ")
.append(MIN_LUNCH_DURATION).append(" min\n")
.toString());
}
private static void showLoadingBarMittagspause(LocalTime startTime) {
showLoadingBarMittagspause(startTime, null);
}
private static void showLoadingBarMittagspause(LocalTime startTime, LocalTime manualEndTime) {
LocalTime endTime = manualEndTime != null ? manualEndTime : startTime.plusMinutes(DEFAULT_NUMBER_WORK_MINS_BEFORE_LUNCH);
LocalTime trueEndTime = endTime.isAfter(LATEST_LUNCH_TIME) ? LATEST_LUNCH_TIME : endTime;
showLoadingBar(startTime, trueEndTime);
}
private static void showLoadingBarZapfenstreich(LocalTime startTime, Integer manualLunchDuration) {
showLoadingBarZapfenstreich(startTime, manualLunchDuration, 0);
}
private static void showLoadingBarZapfenstreich(LocalTime startTime, Integer manualLunchDuration, int endTimeOffset) {
int minLunchDuration = getMinLunchDuration(startTime, endTimeOffset);
int realLunchDuration = getRealLunchDuration(manualLunchDuration, minLunchDuration);
LocalTime trueEndTime = startTime.plusMinutes(MAX_NUMBER_WORK_MINS + realLunchDuration + endTimeOffset);
realShowLoadingBarZapfenstreich(startTime, realLunchDuration, trueEndTime);
}
private static void showLoadingBarZapfenstreich(LocalTime startTime, Integer manualLunchDuration, LocalTime manualEndTime) {
LocalTime trueEndTime = manualEndTime;
int minLunchDuration = getMinLunchDuration(startTime, trueEndTime);
int realLunchDuration = getRealLunchDuration(manualLunchDuration, minLunchDuration);
if (trueEndTime == null) {
trueEndTime = startTime.plusMinutes(MAX_NUMBER_WORK_MINS + realLunchDuration);
}
realShowLoadingBarZapfenstreich(startTime, realLunchDuration, trueEndTime);
}
private static int getMinLunchDuration(LocalTime startTime, int endTimeOffset) {
if (endTimeOffset == 0) {
return MIN_LUNCH_DURATION;
}
int totalDuration = MAX_NUMBER_WORK_MINS + endTimeOffset;
int effectiveLunchDuration = totalDuration - MAX_NUMBER_WORK_MINS_WITHOUT_LUNCH;
return getMinLunchDuration(effectiveLunchDuration);
}
private static int getMinLunchDuration(LocalTime startTime, LocalTime endTime) {
if (endTime == null) {
return MIN_LUNCH_DURATION;
}
long totalDuration = startTime.until(endTime, ChronoUnit.MINUTES);
int effectiveLunchDuration = ((int) totalDuration) - MAX_NUMBER_WORK_MINS_WITHOUT_LUNCH;
return getMinLunchDuration(effectiveLunchDuration);
}
private static int getMinLunchDuration(int effectiveLunchDuration) {
if (effectiveLunchDuration < 0) {
effectiveLunchDuration = 0;
}
return effectiveLunchDuration < MIN_LUNCH_DURATION ? effectiveLunchDuration : MIN_LUNCH_DURATION;
}
private static int getRealLunchDuration(Integer manualLunchDuration, int minLunchDuration) {
return manualLunchDuration != null && manualLunchDuration >= minLunchDuration ? manualLunchDuration : minLunchDuration;
}
private static void realShowLoadingBarZapfenstreich(LocalTime startTime, int manualLunchDuration, LocalTime endTime) {
if (manualLunchDuration > 0) {
var totalWorkTime = LocalTime.MIDNIGHT.plusMinutes(startTime.until(endTime, ChronoUnit.MINUTES) - manualLunchDuration);
System.out.print("Arbeitszeit: " + TIME_FORMATTER.format(totalWorkTime) + "; ");
}
showLoadingBar(startTime, endTime);
}
private static void showLoadingBar(LocalTime startTime, LocalTime endTime) {
long initialMinutes = startTime.until(endTime, ChronoUnit.MINUTES);
System.out.print(minutesToTimeString(initialMinutes) + " gesamt; Endzeit: " + TIME_FORMATTER.format(endTime) + "\n");
long passedMinutes = startTime.until(LocalTime.now(), ChronoUnit.MINUTES);
if (passedMinutes > initialMinutes) {
passedMinutes = initialMinutes;
} else if (passedMinutes < 0) {
System.out.println(fillLoadingBar(initialMinutes, 0, false));
return;
}
while (passedMinutes < initialMinutes) {
System.out.print(fillLoadingBar(initialMinutes, passedMinutes, true));
try {
var now = LocalTime.now();
var oneMinuteLater = now.plusMinutes(1).truncatedTo(ChronoUnit.MINUTES);
// +1 second to adjust for ignored milliseconds as it is better to switch between 00 and 01 as between 59 and 00
TimeUnit.SECONDS.sleep(now.until(oneMinuteLater, ChronoUnit.SECONDS) + 1);
// TimeUnit.SECONDS.sleep(1L); // DEBUG
} catch (InterruptedException ie) {
throw new RuntimeException(ie);
}
passedMinutes++;
}
System.out.println(fillLoadingBar(initialMinutes, passedMinutes, false));
}
private static String fillLoadingBar(long initialMinutes, long passedMinutes, boolean progressive) {
double wholePercentage = ((double) passedMinutes / initialMinutes) * 100;
long remainingMinutes = initialMinutes - passedMinutes;
int numberOfEquals = (int) wholePercentage;
var sb = new StringBuilder("[");
for (int i = 0; i < 100; i++) {
if (i < numberOfEquals) {
sb.append("=");
} else {
sb.append("-");
}
}
sb.append("] ").append(PERCENTAGE_FORMAT.format(wholePercentage)).append("% ")
.append(minutesToTimeString(passedMinutes)).append(" - ").append(minutesToTimeString(remainingMinutes));
if (progressive) {
sb.append("\r");
}
return sb.toString();
}
private static String minutesToTimeString(long minutes) {
return LocalTime.of((int) minutes / 60, (int) minutes % 60).format(TIME_FORMATTER);
}
}

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import java.text.DecimalFormat;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
class SimpleLoadingBar {
private static final String TIME_FORMAT = "HH:mm";
private static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern(TIME_FORMAT);
private static final Pattern TIME_PATTERN = Pattern.compile("(?>[01][0-9]|2[0-4]):[0-5][0-9]");
private static final DecimalFormat PERCENTAGE_FORMAT = new DecimalFormat("00.00");
public static void main(String[] args) {
if (args.length > 0 && Objects.equals(args[0], "--help")) {
printHelp();
return;
}
verifyMinimumNumberOfArgs(args);
String nextArg = args[0];
verifyTimeFormat(nextArg, "Erstes Argument"); // FSFIXME package
var firstTime = LocalTime.parse(nextArg, TIME_FORMATTER); // FSFIXME package
LocalTime startTime = null;
String title = "";
LocalTime endTime = null;
if (args.length > 1) {
startTime = firstTime;
nextArg = args[1];
if (nextArg.equals("-msg")) {
title = args.length > 2 ? args[2] : title;
} else {
verifyTimeFormat(nextArg, "Zweites Argument");
endTime = LocalTime.parse(nextArg, TIME_FORMATTER);
}
} else {
startTime = LocalTime.now();
endTime = firstTime;
}
String fallbackTitle = "Ende! Endzeit " + TIME_FORMATTER.format(endTime) + " erreicht.";
if (args.length == 2 || !title.isBlank()) {
title = title.isBlank() ? fallbackTitle : title;
showLoadingBar(startTime, endTime, title);
return;
}
// if there are 3 arguments, the third will be discarded.
boolean hasTitleArg = args.length > 3 && args[2].equals("-msg");
title = hasTitleArg ? args[3] : title;
title = title.isBlank() ? fallbackTitle : title;
showLoadingBar(startTime, endTime, title);
}
private static void printHelp() {
System.out.println(new StringBuilder().append("Mögliche Argumente für LoadingBar:\n")
.append("Startzeit, Endzeit, Endnachricht (Optional)\n")
.append(TIME_FORMAT).append(" ").append(TIME_FORMAT).append("-msg <Nachricht>\n")
.append("Endzeit (Startzeit = jetzt), Endnachricht (Optional)\n")
.append(TIME_FORMAT).append("-msg <Nachricht>\n")
);
}
private static void verifyMinimumNumberOfArgs(String[] args) {
if (args.length >= 1) {
return;
}
System.out.println("Mindestens 1 Argument muss gegeben sein.");
printHelp();
System.exit(1);
}
private static void verifyTimeFormat(String param, String errMsgPrefix) {
if (TIME_PATTERN.matcher(param).matches()) {
return;
}
System.out.println(errMsgPrefix + " \"" + param + "\" muss Uhrzeitformat ("+ TIME_FORMAT + ") entsprechen.");
System.exit(1);
}
public static void showLoadingBar(LocalTime startTime, LocalTime endTime, String title) {
long initialMinutes = startTime.until(endTime, ChronoUnit.MINUTES);
System.out.print(minutesToTimeString(initialMinutes) + " gesamt; Endzeit: " + TIME_FORMATTER.format(endTime) + "\n");
long passedMinutes = startTime.until(LocalTime.now(), ChronoUnit.MINUTES);
if (passedMinutes > initialMinutes) {
passedMinutes = initialMinutes;
} else if (passedMinutes < 0) {
System.out.println(fillLoadingBar(initialMinutes, 0, false));
return;
}
while (passedMinutes < initialMinutes) {
System.out.print(fillLoadingBar(initialMinutes, passedMinutes, true));
try {
var now = LocalTime.now();
var oneMinuteLater = now.plusMinutes(1).truncatedTo(ChronoUnit.MINUTES);
// +1 second to adjust for ignored milliseconds as it is better to switch between 00 and 01 as between 59 and 00
TimeUnit.SECONDS.sleep(now.until(oneMinuteLater, ChronoUnit.SECONDS) + 1);
// TimeUnit.SECONDS.sleep(1L); // DEBUG
} catch (InterruptedException ie) {
throw new RuntimeException(ie);
}
passedMinutes++;
}
System.out.println(fillLoadingBar(initialMinutes, passedMinutes, false));
System.out.println(formatTitle(title));
}
private static String fillLoadingBar(long initialMinutes, long passedMinutes, boolean progressive) {
double wholePercentage = ((double) passedMinutes / initialMinutes) * 100;
long remainingMinutes = initialMinutes - passedMinutes;
int numberOfEquals = (int) wholePercentage;
var sb = new StringBuilder("[");
for (int i = 0; i < 100; i++) {
if (i < numberOfEquals) {
sb.append("=");
} else {
sb.append("-");
}
}
sb.append("] ").append(PERCENTAGE_FORMAT.format(wholePercentage)).append("% ")
.append(minutesToTimeString(passedMinutes)).append(" - ").append(minutesToTimeString(remainingMinutes));
if (progressive) {
sb.append("\r");
}
return sb.toString();
}
private static String minutesToTimeString(long minutes) {
return LocalTime.of((int) minutes / 60, (int) minutes % 60).format(TIME_FORMATTER);
}
private static String formatTitle(String title) {
var sb = new StringBuilder();
for (int i = 0; i < title.length(); i++) {
sb.append("*");
}
return sb.toString() + "\n" + title + "\n" + sb.toString();
}
}