Add Lottery, ComponentFrame, CurrencyCalculator, TextFrame, and TextfileViewer classes

.gitignore

@@ -1,3 +1,4 @@
 *.class
 *.jar
 .devcontainer
+/*.txt

src/de/dhbwka/java/exercise/collections/Lottery.java

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+package de.dhbwka.java.exercise.collections;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class Lottery {
+  Set<Integer> lotteryNumbers = new HashSet<>();
+  Integer zusatzZahl;
+
+  public Lottery() {
+    while (lotteryNumbers.size() < 7) {
+      int number = (int) (Math.random() * 49) + 1;
+      zusatzZahl = number;
+      lotteryNumbers.add(number);
+    }
+    lotteryNumbers.remove(zusatzZahl);
+
+    String[] lotteryNumbersArray = lotteryNumbers.stream()
+        .sorted()
+        .map(String::valueOf)
+        .toArray(String[]::new);
+
+    System.out.println("Die Lottozahlen sind: " + String.join(", ", lotteryNumbersArray));
+    System.out.println("Die Zusatzzahl ist: " + zusatzZahl);
+  }
+
+  public static void main(String[] args) {
+    new Lottery();
+  }
+}

src/de/dhbwka/java/exercise/ui/ComponentFrame.java

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+package de.dhbwka.java.exercise.ui;
+
+import javax.swing.*;
+
+public class ComponentFrame extends JFrame {
+  public static void main(String[] args) {
+    new ComponentFrame();
+  }
+
+  public ComponentFrame() {
+    this.setTitle("Title");
+    this.setSize(600, 200);
+    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+    JTabbedPane tabbedPane = new JTabbedPane();
+
+    JPanel panel1 = new JPanel();
+    panel1.add(new JLabel("Label"));
+    panel1.add(new JTextField("TextField", 15));
+    panel1.add(new JPasswordField("Password", 15));
+    panel1.add(new JButton("Btn"));
+    panel1.add(new JToggleButton("Toggle"));
+    panel1.add(new JCheckBox("Box"));
+    panel1.add(new JComboBox<String>(new String[] { "Item 1", "Item 2", "Item 3" }));
+    JRadioButton radioButton1 = new JRadioButton("Radio 1");
+    panel1.add(radioButton1);
+    JRadioButton radioButton2 = new JRadioButton("Radio 2");
+    panel1.add(radioButton2);
+    JRadioButton radioButton3 = new JRadioButton("Radio 3");
+    panel1.add(radioButton3);
+    ButtonGroup group = new ButtonGroup();
+    group.add(radioButton1);
+    group.add(radioButton2);
+    group.add(radioButton3);
+    panel1.add(new JTextArea("TextArea", 5, 20));
+    tabbedPane.addTab("Tab 1", panel1);
+
+    JPanel panel2 = new JPanel();
+    panel2.add(new JLabel("Label 2"));
+    panel2.add(new JColorChooser());
+    panel2.add(new JSpinner());
+    panel2.add(new JSlider());
+    panel2.add(new JProgressBar());
+    panel2.add(new JList<String>(new String[] { "List 1", "List 2", "List 3" }));
+    tabbedPane.addTab("Tab 2", panel2);
+
+    this.add(tabbedPane);
+    this.pack();
+    this.setLocationRelativeTo(null);
+    this.setVisible(true);
+  }
+}

src/de/dhbwka/java/exercise/ui/CurrencyCalculator.java

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+package de.dhbwka.java.exercise.ui;
+
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+
+import javax.swing.*;
+
+public class CurrencyCalculator extends JFrame {
+  public static void main(String[] args) {
+    new CurrencyCalculator();
+  }
+
+  public CurrencyCalculator() {
+    initComponents();
+    addEventListeners();
+  }
+
+  private static void addComponent(Container cont, Component c,
+      int x, int y, int width, int height, double weightx, double weighty) {
+    GridBagConstraints gbc = new GridBagConstraints();
+    gbc.fill = GridBagConstraints.BOTH;
+    gbc.gridx = x;
+    gbc.gridy = y;
+    gbc.gridwidth = width;
+    gbc.gridheight = height;
+    gbc.weightx = weightx;
+    gbc.weighty = weighty;
+    cont.add(c, gbc);
+  }
+
+  JTextField amountField = new JTextField();
+  JButton cancelButton = new JButton("Cancel");
+  JButton convertButton = new JButton("Convert");
+
+  String[] currencies = { "EUR", "USD", "GBP", "CHF", "DM" };
+  double[] rates = { 1.0, 0.90054095, 1.1896249, 1.0711047, 0.51129 };
+  
+  JComboBox<String> currencyBoxFrom = new JComboBox<>(currencies);
+  JComboBox<String> currencyBoxTo = new JComboBox<>(currencies);
+
+  private void initComponents() {
+    setTitle("Currency Calculator");
+    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    setLocationRelativeTo(null);
+    setSize(400, 300);
+
+    JPanel panel = new JPanel();
+    panel.setLayout(new GridBagLayout());
+
+    addComponent(panel, amountField, 0, 0, 4, 1, 1.0, 0.0);
+    addComponent(panel, currencyBoxFrom, 0, 1, 1, 1, 0.0, 0.0);
+    addComponent(panel, currencyBoxTo, 1, 1, 1, 1, 0.0, 0.0);
+    addComponent(panel, convertButton, 2, 1, 1, 1, 0.0, 0.0);
+    addComponent(panel, cancelButton, 3, 1, 1, 1, 0.0, 0.0);
+
+    add(panel);
+    pack();
+    setVisible(true);
+  }
+
+  private void addEventListeners() {
+    convertButton.addActionListener(e -> {
+      String from = (String) currencyBoxFrom.getSelectedItem();
+      String to = (String) currencyBoxTo.getSelectedItem();
+      convertCurrency(from, to);
+    });
+    cancelButton.addActionListener(e -> {
+      this.dispose();
+    });
+  };
+
+  private void convertCurrency(String from, String to) {
+    // get the amount from the text field
+    String amountText = amountField.getText();
+    double amount = 0;
+    try {
+      amount = Double.parseDouble(amountText);
+    } catch (NumberFormatException e) {
+      JOptionPane.showMessageDialog(this, "Invalid amount", "Error",
+          JOptionPane.ERROR_MESSAGE);
+      return;
+    }
+    // convert the amount to intermediate currency (EUR)
+    double intermediateAmount = 0;
+    int fromIndex = -1;
+    for (int i = 0; i < currencies.length; i++) {
+      if (currencies[i].equals(from)) {
+        fromIndex = i;
+        break;
+      }
+    }
+    if (fromIndex == -1) {
+      JOptionPane.showMessageDialog(this, "Invalid currency", "Error",
+          JOptionPane.ERROR_MESSAGE);
+      return;
+    }
+    // convert the amount to EUR
+    intermediateAmount = amount * rates[fromIndex];
+
+    // convert the intermediate amount to the target currency
+    double targetAmount = 0;
+    int toIndex = -1;
+    for (int i = 0; i < currencies.length; i++) {
+      if (currencies[i].equals(to)) {
+        toIndex = i;
+        break;
+      }
+    }
+    if (toIndex == -1) {
+      JOptionPane.showMessageDialog(this, "Invalid currency", "Error",
+          JOptionPane.ERROR_MESSAGE);
+      return;
+    }
+    // convert the intermediate amount to the target currency
+    targetAmount = intermediateAmount / rates[toIndex];
+
+    // show the result in a message dialog
+    String message = String.format("Converted amount: %.2f %s", targetAmount, to);
+    JOptionPane.showMessageDialog(this, message, "Result",
+        JOptionPane.INFORMATION_MESSAGE);
+    // clear the text field
+    amountField.setText("");
+    // set focus to the text field
+    amountField.requestFocus();
+  }
+}

src/de/dhbwka/java/exercise/ui/TextFrame.java

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+package de.dhbwka.java.exercise.ui;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+import javax.swing.*;
+
+public class TextFrame extends JFrame {
+  public static void main(String[] args) {
+    if (args.length != 3 || args[0].equals("-h")) {
+      System.err.println("Usage: java TextFrame <filename> <width> <height>");
+      System.exit(1);
+    }
+    try {
+      int width = Integer.parseInt(args[1]);
+      int height = Integer.parseInt(args[2]);
+      new TextFrame(width, height, args[0]);
+    } catch (NumberFormatException e) {
+      System.err.println("Width and height must be integers.");
+      System.exit(1);
+    }
+  }
+
+  public TextFrame(int width, int height, String fileName) {
+    // Load the text file
+    String text = loadTextFile(fileName);
+    if (text == null) {
+      System.err.println("Error loading file: " + fileName);
+      return;
+    }
+    // Create the text area
+    JTextArea textArea = new JTextArea(text);
+    textArea.setLineWrap(true);
+    textArea.setWrapStyleWord(true);
+    JScrollPane scrollPane = new JScrollPane(textArea);
+    scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+    scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
+
+    // Create the frame
+    this.setTitle("TextFrame");
+    this.setSize(width, height);
+    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    this.setLocationRelativeTo(null);
+    this.add(scrollPane);
+    this.setVisible(true);
+  }
+
+  private String loadTextFile(String fileName) {
+    StringBuilder text = new StringBuilder();
+    try (BufferedReader reader = new BufferedReader(new FileReader(fileName))) {
+      String line;
+      while ((line = reader.readLine()) != null) {
+        text.append(line).append("\n");
+      }
+    } catch (IOException e) {
+      e.printStackTrace();
+      return null;
+    }
+    return text.toString();
+  }
+}

src/de/dhbwka/java/exercise/ui/TextfileViewer.java

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+package de.dhbwka.java.exercise.ui;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+
+import java.awt.*;
+import javax.swing.*;
+import javax.swing.filechooser.*;
+
+public class TextfileViewer {
+  public static void main(String[] args) {
+    new TextfileViewer();
+  }
+
+  public TextfileViewer() {
+    initComponents();
+  }
+
+  private void initComponents() {
+    JFileChooser fc = new javax.swing.JFileChooser();
+    fc.setFileFilter(new FileFilter() {
+      @Override
+      public boolean accept(File f) {
+        return f.isDirectory() ||
+            f.getName().toLowerCase().endsWith(".txt");
+      }
+
+      @Override
+      public String getDescription() {
+        return "Text Files";
+      }
+    });
+    int state = fc.showOpenDialog(null);
+    if (state == JFileChooser.APPROVE_OPTION) {
+      this.openFile(fc.getSelectedFile(), "labels");
+      this.openFile(fc.getSelectedFile(), "textArea");
+    } else {
+      this.error("No file selected");
+    }
+  }
+
+  private void openFile(File file, String mode) {
+    JFrame frame = new JFrame("Textfile Viewer - " + file.getName());
+    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+    frame.setLocationRelativeTo(null);
+
+    if (mode.equals("labels")) {
+
+      JPanel panel = new JPanel();
+      panel.setLayout(new GridLayout(10, 1, 2, 2));
+      try (BufferedReader br = new BufferedReader(new FileReader(file))) {
+        String line;
+        int i = 0;
+        while ((line = br.readLine()) != null && i++ < 10) {
+          JLabel label = new JLabel(line);
+          panel.add(label);
+        }
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+
+      frame.add(panel);
+      frame.setSize(400, 300);
+      frame.setVisible(true);
+    } else if (mode.equals("textArea")) {
+      JTextArea textArea = new JTextArea();
+      textArea.setEditable(false);
+      try (BufferedReader br = new BufferedReader(new FileReader(file))) {
+        String line;
+        while ((line = br.readLine()) != null) {
+          textArea.append(line + "\n");
+        }
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+
+      JScrollPane scrollPane = new JScrollPane(textArea);
+      frame.add(scrollPane);
+      frame.setSize(400, 300);
+      frame.setVisible(true);
+    }
+  }
+
+  private void error(String message) {
+    JOptionPane.showMessageDialog(null, message, "Error", JOptionPane.ERROR_MESSAGE);
+  }
+}