Dateien nach "/" hochladen
commit
c59288f627
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@ -0,0 +1,24 @@
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package Date;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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public class DateFormatConverter {
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public static String convertDate(String inputDate) {
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try {
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Date date = new SimpleDateFormat("dd.MM.yyyy").parse(inputDate);
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return new SimpleDateFormat("yyyy-MM-dd").format(date);
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} catch (Exception e) {
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System.err.println("Fehler beim Konvertieren des Datums: " + e.getMessage());
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return null;
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}
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}
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public static void main(String[] args) {
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String inputDate = "25.04.2024";
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String convertedDate = convertDate(inputDate);
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if (convertedDate != null) {
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System.out.println("Ursprüngliches Datum: " + inputDate);
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System.out.println("Konvertiertes Datum: " + convertedDate);
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}
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}
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}
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package printF;
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public class DoubleFormatter {
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public static void printDouble(double zahl, int nachkommastellen) {
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double multiplikator = 1;
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for (int i = 0; i < nachkommastellen; i++) {
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multiplikator *= 10;
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}
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long temp = (long) (zahl * multiplikator + 0.5);
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double gerundeterWert = (double) temp/ multiplikator;
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System.out.println(gerundeterWert);
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}
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public static void main(String[] args) {
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printDouble(1.0, 1); // Erwartete Ausgabe: 1.0
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printDouble(10.1, 1); // Erwartete Ausgabe: 10.1
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printDouble(2.01, 2); // Erwartete Ausgabe: 2.01
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printDouble(2.006, 2); // Erwartete Ausgabe: 2.01
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printDouble(2.0001, 2); // Erwartete Ausgabe: 2.00
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printDouble(2.0005, 3); // Erwartete Ausgabe: 2.001
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printDouble(123.456, 1); // Erwartete Ausgabe: 123.4
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printDouble(9876.54321, 3); // Erwartete Ausgabe: 9876.543
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}
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}
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@ -0,0 +1,48 @@
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package Buffer;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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public class Main {
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public static void main(String[] args) {
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try (BufferedWriter writer = new BufferedWriter(new FileWriter("gedicht.txt"))) {
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writer.write("Mondnacht");
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writer.newLine();
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writer.write("Es war, als hätt' der Himmel");
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writer.newLine();
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writer.write("Die Erde still geküsst,");
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writer.newLine();
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writer.write("Dass sie im Blütenschimmer");
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writer.newLine();
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writer.write("Von ihm nun träumen müsst.");
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System.out.println("Das Gedicht wurde erfolgreich in die Datei geschrieben.");
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} catch (IOException e) {
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System.err.println("Fehler beim Schreiben der Datei: " + e.getMessage());
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}
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// Reader----------------------------------------------------------
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try (BufferedReader reader = new BufferedReader(new FileReader("gedicht.txt"))) {
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String line;
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int count = 1;
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int totalChars = 0;
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int totalWords = 0;
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int totalLines = 0;
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while ((line = reader.readLine()) != null) {
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System.out.printf("%3d: %s%n", count, line);
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totalChars += line.length();
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totalWords += line.split("\\s+").length;
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totalLines++;
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count++;
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}
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System.out.println("Anzahl der Buchstaben: " + totalChars);
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System.out.println("Anzahl der Wörter: " + totalWords);
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System.out.println("Anzahl der Zeilen: " + totalLines);
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} catch (IOException e) {
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System.err.println("Fehler beim Lesen der Datei: " + e.getMessage());
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}
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}
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}
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package Serialisierung;
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import java.io.Serializable;
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public class Product implements Serializable {
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/**
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*
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*/
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private static final long serialVersionUID = 1L;
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private String name;
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private String description;
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private double price;
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public Product() {}
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public Product(String name, String description, double price) {
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this.name = name;
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this.description = description;
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this.price = price;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getDescription() {
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return description;
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}
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public void setDescription(String description) {
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this.description = description;
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}
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public double getPrice() {
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return price;
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}
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public void setPrice(double price) {
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this.price = price;
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}
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}
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@ -0,0 +1,44 @@
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package Serialisierung;
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import java.io.*;
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public class SerializationExample {
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public static void main(String[] args) {
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// Erstelle ein Produkt
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Product product = new Product("Smartphone", "Ein leistungsstarkes Smartphone", 699.99);
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// Dateiname für die Serialisierung
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String filename = "product.ser";
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// Serialisierung
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serializeProduct(product, filename);
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// Deserialisierung und Ausgabe
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Product deserializedProduct = deserializeProduct(filename);
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System.out.println("Deserialisiertes Produkt:");
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System.out.println("Name: " + deserializedProduct.getName());
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System.out.println("Beschreibung: " + deserializedProduct.getDescription());
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System.out.println("Preis: " + deserializedProduct.getPrice());
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}
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// Methode zur Serialisierung eines Produkts
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private static void serializeProduct(Product product, String filename) {
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try (ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream(filename))) {
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outputStream.writeObject(product);
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System.out.println("Produkt wurde erfolgreich serialisiert.");
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} catch (IOException e) {
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System.err.println("Fehler bei der Serialisierung des Produkts: " + e.getMessage());
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}
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}
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// Methode zur Deserialisierung eines Produkts
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private static Product deserializeProduct(String filename) {
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Product product = null;
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try (ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream(filename))) {
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product = (Product) inputStream.readObject();
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System.out.println("Produkt wurde erfolgreich deserialisiert.");
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} catch (IOException | ClassNotFoundException e) {
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System.err.println("Fehler bei der Deserialisierung des Produkts: " + e.getMessage());
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}
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return product;
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}
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}
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