Added playing vard class

.gitignore

@@ -8,6 +8,7 @@ target/
 .idea/jarRepositories.xml
 .idea/compiler.xml
 .idea/libraries/
+target
 *.iws
 *.iml
 *.ipr

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

src/main/java/edu/ntnu/stud/cardgame/Main.java

 package edu.ntnu.stud.cardgame;
 
 import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.control.Button;
+import javafx.scene.layout.StackPane;
 import javafx.stage.Stage;
 
 public class Main extends Application {
+  Button button;
   @Override
   public void start(Stage stage) throws Exception {
+    stage.setTitle("Card game");
 
+    button = new Button("Knapp");
+
+    StackPane layout = new StackPane();
+    layout.getChildren().add(button);
+    stage.setScene(new Scene(layout));
+    stage.show();
   }
 
   public static void main(String[] args) {

src/main/java/edu/ntnu/stud/cardgame/PlayingCard.java

+package edu.ntnu.stud.cardgame;
+
+/**
+ * Represents a playing card. A playing card has a number (face) between
+ * 1 and 13, where 1 is called an Ace, 11 = Knight, 12 = Queen and 13 = King.
+ * The card can also be one of 4 suits: Spade, Heart, Diamonds and Clubs.
+ *
+ * @author ntnu
+ * @version 2021-03-13
+ */
+public class PlayingCard {
+
+  private final char suit; // 'S'=spade, 'H'=heart, 'D'=diamonds, 'C'=clubs
+  private final int face; // a number between 1 and 13
+
+  /**
+   * Creates an instance of a PlayingCard with a given suit and face.
+   * The face value is an integer between 1 and 13, where 11 represents the jack,
+   * 12 represents the queen and 13 represents the king. The Ace is represented by the
+   * number 1.
+   *
+   * <p>If the suit or face are invalid, an {@code IllegalArgumentException} is thrown.</p>
+   *
+   * @param suit The suit of the card, as a single character. 'S' for Spades,
+   *             'H' for Heart, 'D' for Diamonds and 'C' for clubs
+   * @param face The face value of the card, an integer between 1 and 13
+   * @throws IllegalArgumentException if suit or face have invalid values.
+   */
+  public PlayingCard(char suit, int face) {
+    if (suit != 'H' && suit != 'D' && suit != 'C' && suit != 'S') {
+      throw new IllegalArgumentException("Parameter suit must be one of H, D, C or S");
+    }
+
+    if (face < 1 || face > 13) {
+      throw new IllegalArgumentException("Parameter face must be a number between 1 to 13");
+    }
+
+    this.suit = suit;
+    this.face = face;
+  }
+
+  /**
+   * Returns the suit and face of the card as a string.
+   * A 4 of hearts is returned as the string "H4".
+   *
+   * @return the suit and face of the card as a string
+   */
+  public String getAsString() {
+    return String.format("%s%s", suit, face);
+  }
+
+  /**
+   * Returns the suit of the card, 'S' for Spades, 'H' for Heart,
+   * 'D' for Diamonds and 'C' for clubs.
+   *
+   * @return the suit of the card
+   */
+  public char getSuit() {
+    return suit;
+  }
+
+  /**
+   * Returns the face of the card (value between 1 and 13).
+   *
+   * @return the face of the card
+   */
+  public int getFace() {
+    return face;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    PlayingCard otherCard = (PlayingCard) o;
+    return getSuit() == otherCard.getSuit() && getFace() == otherCard.getFace();
+  }
+
+  @Override
+  public int hashCode() {
+    int hash = 7;
+    hash = 31 * hash + getSuit();
+    hash = 31 * hash + getFace();
+    return hash;
+  }
+}