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Task/Penneys-game/Java/penneys-game.java

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+import java.util.*;
+
+public class PenneysGame {
+
+    public static void main(String[] args) {
+        Random rand = new Random();
+
+        String compChoice = "", playerChoice;
+        if (rand.nextBoolean()) {
+
+            for (int i = 0; i < 3; i++)
+                compChoice += "HT".charAt(rand.nextInt(2));
+            System.out.printf("Computer chooses %s%n", compChoice);
+
+            playerChoice = prompt(compChoice);
+
+        } else {
+
+            playerChoice = prompt(compChoice);
+
+            compChoice = "T";
+            if (playerChoice.charAt(1) == 'T')
+                compChoice = "H";
+            compChoice += playerChoice.substring(0, 2);
+            System.out.printf("Computer chooses %s%n", compChoice);
+        }
+
+        String tossed = "";
+        while (true) {
+            tossed += "HT".charAt(rand.nextInt(2));
+            System.out.printf("Tossed %s%n" , tossed);
+            if (tossed.endsWith(playerChoice)) {
+                System.out.println("You win!");
+                break;
+            }
+            if (tossed.endsWith(compChoice)) {
+                System.out.println("Computer wins!");
+                break;
+            }
+        }
+    }
+
+    private static String prompt(String otherChoice) {
+        Scanner sc = new Scanner(System.in);
+        String s;
+        do {
+            System.out.print("Choose a sequence: ");
+            s = sc.nextLine().trim().toUpperCase();
+        } while (!s.matches("[HT]{3}") || s.equals(otherChoice));
+        return s;
+    }
+}