Magpie things

ATM.java

@@ -0,0 +1,47 @@
+/**
+ * When you use an automated teller machine (ATM) with
+ * your bank card, you need to use a personal identification
+ * number (PIN) to access your account. If a user fails more
+ * than three times when entering the PIN, the machine will
+ * block the card. Assume that the user’s PIN is “1234” and
+ * write a program that asks the user for the PIN no more than
+ * three times, and does the following:
+ * • If the user enters the right number, print a message saying, “Your PIN is
+ * correct”, and end the program.
+ * • If the user enters a wrong number, print a message saying, “Your PIN is
+ * incorrect” and, if you have asked for the PIN less than three times, ask for
+ * it
+ * again.
+ * • If the user enters a wrong number three times, print a message saying “Your
+ * bank card is blocked” and end the program.
+ */
+
+public class ATM {
+    private final String pin = "1234";
+    private int attempts = 0;
+
+    public ATM() {
+    }
+
+    public void checkPin(String pin) {
+        if (this.pin.equals(pin)) {
+            System.out.println("Your PIN is correct");
+            System.exit(0);
+        } else {
+            System.out.println("Your PIN is incorrect");
+            if (attempts < 2) {
+                attempts++;
+            } else {
+                System.out.println("Your bank card is blocked");
+                System.exit(0);
+            }
+        }
+    }
+
+    public static void main(String... args) {
+        ATM atm = new ATM();
+        atm.checkPin("1235");
+        atm.checkPin("1236");
+        atm.checkPin("1237");
+    }
+}

Magpie/Activity_2/Magpie2.java

@@ -0,0 +1,104 @@
+package Magpie.Activity_2;
+
+/**
+ * A program to carry on conversations with a human user.
+ * This is the initial version that:
+ * <ul>
+ * <li>
+ * Uses indexOf to find strings
+ * </li>
+ * <li>
+ * Handles responding to simple words and phrases
+ * </li>
+ * </ul>
+ * This version uses a nested if to handle default responses.
+ * 
+ * @author Laurie White
+ * @version April 2012
+ */
+public class Magpie2 {
+	/**
+	 * Get a default greeting
+	 * 
+	 * @return a greeting
+	 */
+	public String getGreeting() {
+		return "Hello, let's talk.";
+	}
+
+	/**
+	 * Gives a response to a user statement
+	 * 
+	 * @param statement
+	 *                  the user statement
+	 * @return a response based on the rules given
+	 */
+	public String getResponse(String statement) {
+		String response = "";
+		if (statement.indexOf("no") >= 0) {
+			response = "Why so negative?" ;
+		} else if (statement.indexOf(" mother ") >= 0
+				|| statement.indexOf(" father ") >= 0
+				|| statement.indexOf(" sister ") >= 0
+				|| statement.indexOf(" brothe r") >= 0) {
+			response = "Tell me more about your family.";
+		} else if (index(statement, " dog ") || index(statement, " cat ")) {
+			response = "Tell me more about your pets.";
+		} else if (index(statement, " Mr. ") || index(statement, " Mrs. ") || index(statement, " Ms. ")) {
+			response = "They sound like a good teacher.";
+		} else if (statement == "") {
+			response = "Say something, please.";
+		} else if (index(statement, " food ")) {
+			response = "What's your favorite food?";
+		} else if (index(statement, " color ")) {
+			response = "What's your favorite color?";
+		} else if (index(statement, " movie ")) {
+			response = "What's your favorite movie?";
+		} else if (index(statement, " book ")) {
+			response = "What's your favorite book?";
+		} else if (index(statement, " sport ")) {
+			response = "What's your favorite sport?";
+		} else {
+			response = getRandomResponse();
+		}
+		return response;
+	}
+
+	/**
+	 * Pick a default response to use if nothing else fits.
+	 * 
+	 * @return a non-committal string
+	 */
+	private String getRandomResponse() {
+		final int NUMBER_OF_RESPONSES = 4;
+		double r = Math.random();
+		int whichResponse = (int) (r * NUMBER_OF_RESPONSES);
+		String response = "";
+
+		if (whichResponse == 0) {
+			response = "Interesting, tell me more.";
+		} else if (whichResponse == 1) {
+			response = "Hmmm.";
+		} else if (whichResponse == 2) {
+			response = "Do you really think so?";
+		} else if (whichResponse == 3) {
+			response = "You don't say.";
+		}
+
+		return response;
+	}
+
+	/**
+	 * Search for one word in phrase. The search is not case sensitive.
+	 * @param string1 full statement
+	 * @param string2 substring to search for
+	 * @return true if the substring is found, false otherwise
+	 */
+	private boolean index(String string1, String string2) {
+		if (string1.indexOf(string2) >= 0) {
+			return true;
+		} else {
+			return false;
+		}
+	}
+}

Magpie/Activity_2/MagpieRunner2.java

@@ -0,0 +1,31 @@
+package Magpie.Activity_2;
+
+import java.util.Scanner;
+
+/**
+ * A simple class to run the Magpie class.
+ * 
+ * @author Laurie White
+ * @version April 2012
+ */
+public class MagpieRunner2 {
+
+	/**
+	 * Create a Magpie, give it user input, and print its replies.
+	 */
+	public static void main(String[] args) {
+		Magpie2 maggie = new Magpie2();
+
+		System.out.println(maggie.getGreeting());
+		Scanner in = new Scanner(System.in);
+		String statement = in.nextLine();
+
+		while (!statement.equals("Bye")) {
+			System.out.println(maggie.getResponse(statement));
+			statement = in.nextLine();
+		}
+
+		in.close();
+	}
+
+}

Magpie/Activity_3/Magpie3.java

@@ -0,0 +1,152 @@
+package Magpie.Activity_3;
+
+/**
+ * A program to carry on conversations with a human user.
+ * This version:
+ * <ul>
+ * <li>
+ * Uses advanced search for keywords
+ * </li>
+ * </ul>
+ * 
+ * @author Laurie White
+ * @version April 2012
+ */
+public class Magpie3 {
+    /**
+     * Get a default greeting
+     * 
+     * @return a greeting
+     */
+    public String getGreeting() {
+        return "Hello, let's talk.";
+    }
+
+    /**
+     * Gives a response to a user statement
+     * 
+     * @param statement
+     *                  the user statement
+     * @return a response based on the rules given
+     */
+    public String getResponse(String statement) {
+        String response = "";
+        if (statement.length() == 0) {
+            response = "Say something, please.";
+        } else if (findKeyword(statement, "no") >= 0) {
+            response = "Why so negative?";
+        } else if (findKeyword(statement, "mother") >= 0
+                || findKeyword(statement, "father") >= 0
+                || findKeyword(statement, "sister") >= 0
+                || findKeyword(statement, "brother") >= 0) {
+            response = "Tell me more about your family.";
+        } else {
+            response = getRandomResponse();
+        }
+        return response;
+    }
+
+    /**
+     * Search for one word in phrase. The search is not case
+     * sensitive. This method will check that the given goal
+     * is not a substring of a longer string (so, for
+     * example, "I know" does not contain "no").
+     * 
+     * @param statement
+     *                  the string to search
+     * @param goal
+     *                  the string to search for
+     * @param startPos
+     *                  the character of the string to begin the
+     *                  search at
+     * @return the index of the first occurrence of goal in
+     *         statement or -1 if it's not found
+     */
+    private int findKeyword(String statement, String goal,
+            int startPos) {
+        String phrase = statement.trim();
+        // The only change to incorporate the startPos is in
+        // the line below
+        int psn = phrase.toLowerCase().indexOf(
+                goal.toLowerCase(), startPos);
+
+        // Refinement--make sure the goal isn't part of a
+        // word
+        while (psn >= 0) {
+            // Find the string of length 1 before and after
+            // the word
+            String before = " ", after = " ";
+            if (psn > 0) {
+                before = phrase.substring(psn - 1, psn)
+                        .toLowerCase();
+            }
+            if (psn + goal.length() < phrase.length()) {
+                after = phrase.substring(
+                        psn + goal.length(),
+                        psn + goal.length() + 1)
+                        .toLowerCase();
+            }
+
+            // If before and after aren't letters, we've
+            // found the word
+            if (((before.compareTo("a") < 0) || (before
+                    .compareTo("z") > 0)) // before is not a
+                                          // letter
+                    && ((after.compareTo("a") < 0) || (after
+                            .compareTo("z") > 0))) {
+                return psn;
+            }
+
+            // The last position didn't work, so let's find
+            // the next, if there is one.
+            psn = phrase.indexOf(goal.toLowerCase(),
+                    psn + 1);
+
+        }
+
+        return -1;
+    }
+
+    /**
+     * Search for one word in phrase. The search is not case
+     * sensitive. This method will check that the given goal
+     * is not a substring of a longer string (so, for
+     * example, "I know" does not contain "no"). The search
+     * begins at the beginning of the string.
+     * 
+     * @param statement
+     *                  the string to search
+     * @param goal
+     *                  the string to search for
+     * @return the index of the first occurrence of goal in
+     *         statement or -1 if it's not found
+     */
+    private int findKeyword(String statement, String goal) {
+        return findKeyword(statement, goal, 0);
+    }
+
+    /**
+     * Pick a default response to use if nothing else fits.
+     * 
+     * @return a non-committal string
+     */
+    private String getRandomResponse() {
+        final int NUMBER_OF_RESPONSES = 4;
+        double r = Math.random();
+        int whichResponse = (int) (r * NUMBER_OF_RESPONSES);
+        String response = "";
+
+        if (whichResponse == 0) {
+            response = "Interesting, tell me more.";
+        } else if (whichResponse == 1) {
+            response = "Hmmm.";
+        } else if (whichResponse == 2) {
+            response = "Do you really think so?";
+        } else if (whichResponse == 3) {
+            response = "You don't say.";
+        }
+
+        return response;
+    }
+
+}

Magpie/Activity_3/MagpieRunner3.java

@@ -0,0 +1,30 @@
+package Magpie.Activity_3;
+
+import java.util.Scanner;
+
+/**
+ * A simple class to run the Magpie class.
+ * 
+ * @author Laurie White
+ * @version April 2012
+ */
+public class MagpieRunner3 {
+
+    /**
+     * Create a Magpie, give it user input, and print its replies.
+     */
+    public static void main(String[] args) {
+        Magpie3 maggie = new Magpie3();
+
+        System.out.println(maggie.getGreeting());
+        Scanner in = new Scanner(System.in);
+        String statement = in.nextLine();
+
+        while (!statement.equals("Bye")) {
+            System.out.println(maggie.getResponse(statement));
+            statement = in.nextLine();
+        }
+        in.close();
+    }
+
+}