Java version of Chemist and documentation fix for method in Change

22 Change/java/src/Change.java

@@ -153,7 +153,7 @@ public class Change {
 
     /*
      * Print a message on the screen, then accept input from Keyboard.
-     * Converts input to Integer
+     * Converts input to a Double
      *
      * @param text message to be displayed on screen.
      * @return what was typed by the player.

24 Chemist/java/src/Chemist.java

@@ -0,0 +1,143 @@
+import java.util.Arrays;
+import java.util.Scanner;
+
+/**
+ * Game of Chemist
+ * <p>
+ * Based on the Basic game of Chemist here
+ * https://github.com/coding-horror/basic-computer-games/blob/main/24%20Chemist/chemist.bas
+ * <p>
+ * Note:  The idea was to create a version of the 1970's Basic game in Java, without introducing
+ * new features - no additional text, error checking, etc has been added.
+ */
+public class Chemist {
+
+    public static final int MAX_LIVES = 9;
+
+    // Used for keyboard input
+    private final Scanner kbScanner;
+
+    private enum GAME_STATE {
+        START_GAME,
+        INPUT,
+        BLOWN_UP,
+        SURVIVED,
+        GAME_OVER
+    }
+
+    // Current game state
+    private GAME_STATE gameState;
+
+    private int timesBlownUp;
+
+    public Chemist() {
+        kbScanner = new Scanner(System.in);
+
+        gameState = GAME_STATE.START_GAME;
+    }
+
+    /**
+     * Main game loop
+     */
+    public void play() {
+
+        do {
+            switch (gameState) {
+
+                case START_GAME:
+                    intro();
+                    timesBlownUp = 0;
+                    gameState = GAME_STATE.INPUT;
+                    break;
+
+                case INPUT:
+
+                    int amountOfAcid = (int) (Math.random() * 50);
+                    int correctAmountOfWater = (7 * amountOfAcid) / 3;
+                    int water = displayTextAndGetNumber(amountOfAcid + " LITERS OF KRYPTOCYANIC ACID.  HOW MUCH WATER? ");
+
+                    // Calculate if the player mixed enough water
+                    int result = Math.abs(correctAmountOfWater - water);
+
+                    // Ratio of water wrong?
+                    if (result > (correctAmountOfWater / 20)) {
+                        gameState = GAME_STATE.BLOWN_UP;
+                    } else {
+                        // Got the ratio correct
+                        gameState = GAME_STATE.SURVIVED;
+                    }
+                    break;
+
+                case BLOWN_UP:
+                    System.out.println(" SIZZLE!  YOU HAVE JUST BEEN DESALINATED INTO A BLOB");
+                    System.out.println(" OF QUIVERING PROTOPLASM!");
+
+                    timesBlownUp++;
+
+                    if (timesBlownUp < MAX_LIVES) {
+                        System.out.println(" HOWEVER, YOU MAY TRY AGAIN WITH ANOTHER LIFE.");
+                        gameState = GAME_STATE.INPUT;
+                    } else {
+                        System.out.println(" YOUR " + MAX_LIVES + " LIVES ARE USED, BUT YOU WILL BE LONG REMEMBERED FOR");
+                        System.out.println(" YOUR CONTRIBUTIONS TO THE FIELD OF COMIC BOOK CHEMISTRY.");
+                        gameState = GAME_STATE.GAME_OVER;
+                    }
+
+                    break;
+
+                case SURVIVED:
+                    System.out.println(" GOOD JOB! YOU MAY BREATHE NOW, BUT DON'T INHALE THE FUMES!");
+                    System.out.println();
+                    gameState = GAME_STATE.INPUT;
+                    break;
+
+            }
+        } while (gameState != GAME_STATE.GAME_OVER);
+    }
+
+    private void intro() {
+        System.out.println(simulateTabs(33) + "CHEMIST");
+        System.out.println(simulateTabs(15) + "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY");
+        System.out.println();
+        System.out.println("THE FICTITIOUS CHEMICAL KRYPTOCYANIC ACID CAN ONLY BE");
+        System.out.println("DILUTED BY THE RATIO OF 7 PARTS WATER TO 3 PARTS ACID.");
+        System.out.println("IF ANY OTHER RATIO IS ATTEMPTED, THE ACID BECOMES UNSTABLE");
+        System.out.println("AND SOON EXPLODES.  GIVEN THE AMOUNT OF ACID, YOU MUST");
+        System.out.println("DECIDE WHO MUCH WATER TO ADD FOR DILUTION.  IF YOU MISS");
+        System.out.println("YOU FACE THE CONSEQUENCES.");
+    }
+
+    /*
+     * Print a message on the screen, then accept input from Keyboard.
+     * Converts input to an Integer
+     *
+     * @param text message to be displayed on screen.
+     * @return what was typed by the player.
+     */
+    private int displayTextAndGetNumber(String text) {
+        return Integer.parseInt(displayTextAndGetInput(text));
+    }
+
+    /*
+     * 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();
+    }
+
+    /**
+     * Simulate the old basic tab(xx) command which indented text by xx spaces.
+     *
+     * @param spaces number of spaces required
+     * @return String with number of spaces
+     */
+    private String simulateTabs(int spaces) {
+        char[] spacesTemp = new char[spaces];
+        Arrays.fill(spacesTemp, ' ');
+        return new String(spacesTemp);
+    }
+}

24 Chemist/java/src/ChemistGame.java

@@ -0,0 +1,6 @@
+public class ChemistGame {
+    public static void main(String[] args) {
+        Chemist chemist = new Chemist();
+        chemist.play();
+    }
+}