Java version of Train

91 Train/java/src/Train.java

@@ -0,0 +1,109 @@
+import java.util.Arrays;
+import java.util.Scanner;
+
+/**
+ * Train
+ * <p>
+ * Based on the Basic program Train here
+ * https://github.com/coding-horror/basic-computer-games/blob/main/91%20Train/train.bas
+ * <p>
+ * Note:  The idea was to create a version of the 1970's Basic program in Java, without introducing
+ * new features - no additional text, error checking, etc has been added.
+ */
+public class Train {
+
+    private final Scanner kbScanner;
+
+    public Train() {
+        kbScanner = new Scanner(System.in);
+    }
+
+    public void process() {
+
+        intro();
+
+        boolean gameOver = false;
+
+        do {
+            double carMph = (int) (25 * Math.random() + 40);
+            double hours = (int) (15 * Math.random() + 5);
+            double train = (int) (19 * Math.random() + 20);
+
+            System.out.println(" A CAR TRAVELING " + (int) carMph + " MPH CAN MAKE A CERTAIN TRIP IN");
+            System.out.println((int) hours + " HOURS LESS THAN A TRAIN TRAVELING AT " + (int) train + " MPH.");
+
+            double howLong = Double.parseDouble(displayTextAndGetInput("HOW LONG DOES THE TRIP TAKE BY CAR? "));
+
+            double hoursAnswer = hours * train / (carMph - train);
+            int percentage = (int) (Math.abs((hoursAnswer - howLong) * 100 / howLong) + .5);
+            if (percentage > 5) {
+                System.out.println("SORRY.  YOU WERE OFF BY " + percentage + " PERCENT.");
+            } else {
+                System.out.println("GOOD! ANSWER WITHIN " + percentage + " PERCENT.");
+            }
+            System.out.println("CORRECT ANSWER IS " + hoursAnswer + " HOURS.");
+
+            System.out.println();
+            if (!yesEntered(displayTextAndGetInput("ANOTHER PROBLEM (YES OR NO)? "))) {
+                gameOver = true;
+            }
+
+        } while (!gameOver);
+
+
+    }
+
+    private void intro() {
+        System.out.println("TRAIN");
+        System.out.println("CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY");
+        System.out.println();
+        System.out.println("TIME - SPEED DISTANCE EXERCISE");
+        System.out.println();
+    }
+
+    /*
+     * Print a message on the screen, then accept input from Keyboard.
+     *
+     * @param text message to be displayed on screen.
+     * @return what was typed by the player.
+     */
+    private String displayTextAndGetInput(String text) {
+        System.out.print(text);
+        return kbScanner.next();
+    }
+
+    /**
+     * Checks whether player entered Y or YES to a question.
+     *
+     * @param text player string from kb
+     * @return true of Y or YES was entered, otherwise false
+     */
+    private boolean yesEntered(String text) {
+        return stringIsAnyValue(text, "Y", "YES");
+    }
+
+    /**
+     * Check whether a string equals one of a variable number of values
+     * Useful to check for Y or YES for example
+     * Comparison is case insensitive.
+     *
+     * @param text   source string
+     * @param values a range of values to compare against the source string
+     * @return true if a comparison was found in one of the variable number of strings passed
+     */
+    private boolean stringIsAnyValue(String text, String... values) {
+
+        return Arrays.stream(values).anyMatch(str -> str.equalsIgnoreCase(text));
+
+    }
+
+    /**
+     * Program startup.
+     *
+     * @param args not used (from command line).
+     */
+    public static void main(String[] args) {
+        Train train = new Train();
+        train.process();
+    }
+}