java: Start track with Bob

This is the complete skeleton for enabling Java, from curriculum
through the first exercise. Java is listed in the main curriculum.rb
but commented out; we will activate once there are a sufficient body
of exercises ported.

The java.png icon is taken from http://findicons.com/icon/88943/java?id=89126,
released under a freeware license.

Describe how to minimally set-up Java and JUnit. (Future work may
try to see if we can get Locale.additional_files working and provide
build integration via Gradle or Maven.)

The BobTest is a straight up port of the Python Bob.

This starts the path of fixing #933.

assignments/java/bob/BobTest.java

@@ -0,0 +1,138 @@
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class BobTest {
+    private final Bob bob = new Bob();
+
+    @Test
+    public void say_something() {
+        assertEquals(
+            "Whatever.",
+            bob.hey("Tom-ay-to, tom-aaaah-to.")
+        );
+    }
+
+    @Test
+    public void shouting() {
+        assertEquals(
+            "Woah, chill out!",
+            bob.hey("WATCH OUT!")
+        );
+    }
+
+    @Test
+    public void asking_a_question() {
+        assertEquals(
+            "Sure.",
+            bob.hey("Does this cryogenic chamber make me look fat?")
+        );
+    }
+
+    @Test
+    public void asking_a_numeric_question() {
+        assertEquals(
+            "Sure.",
+            bob.hey("You are, what, like 15?")
+        );
+    }
+
+    @Test
+    public void talking_forcefully() {
+        assertEquals(
+            "Whatever.",
+            bob.hey("Let's go make out behind the gym!")
+        );
+    }
+
+    @Test
+    public void using_acronyms_in_regular_speech() {
+        assertEquals(
+            "Whatever.", bob.hey("It's OK if you don't want to go to the DMV.")
+        );
+    }
+
+    @Test
+    public void forceful_questions() {
+        assertEquals(
+            "Woah, chill out!", bob.hey("WHAT THE HELL WERE YOU THINKING?")
+        );
+    }
+
+    @Test
+    public void shouting_numbers() {
+        assertEquals(
+            "Woah, chill out!", bob.hey("1, 2, 3 GO!")
+        );
+    }
+
+    @Test
+    public void only_numbers() {
+        assertEquals(
+            "Whatever.", bob.hey("1, 2, 3")
+        );
+    }
+
+    @Test
+    public void question_with_only_numbers() {
+        assertEquals(
+            "Sure.", bob.hey("4?")
+        );
+    }
+
+    @Test
+    public void shouting_with_special_characters() {
+        assertEquals(
+            "Woah, chill out!", bob.hey("ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!")
+        );
+    }
+
+    @Test
+    public void shouting_with_umlauts() {
+        assertEquals(
+            "Woah, chill out!", bob.hey("\u00dcML\u00c4\u00dcTS!")
+        );
+    }
+
+    @Test
+    public void calmly_speaking_with_umlauts() {
+        assertEquals(
+            "Whatever.", bob.hey("\u00dcML\u00e4\u00dcTS!")
+        );
+    }
+
+    @Test
+    public void shouting_with_no_exclamation_mark() {
+        assertEquals(
+            "Woah, chill out!", bob.hey("I HATE YOU")
+        );
+    }
+
+    @Test
+    public void statement_containing_question_mark() {
+        assertEquals(
+            "Whatever.", bob.hey("Ending with ? means a question.")
+        );
+    }
+
+    @Test
+    public void prattling_on() {
+        assertEquals(
+            "Sure.", bob.hey("Wait! Hang on. Are you going to be OK?")
+        );
+    }
+
+    @Test
+    public void silence() {
+        assertEquals(
+            "Fine. Be that way!", bob.hey("")
+        );
+    }
+
+    @Test
+    public void prolonged_silence() {
+        assertEquals(
+            "Fine. Be that way!", bob.hey("    ")
+        );
+    }
+}

assignments/java/bob/example.java

@@ -0,0 +1,35 @@
+/**
+ * Bob is a lackadasical teenager.
+ */
+public class Bob {
+    public String hey(String input) {
+        input = normalize(input);
+        if (isSilence(input))
+            return "Fine. Be that way!";
+        if (isShout(input))
+            return "Woah, chill out!";
+        if (isQuestion(input))
+            return "Sure.";
+        return "Whatever.";
+    }
+
+    private static String normalize(String input) {
+        return input.trim();
+    }
+
+    private static boolean isSilence(String input) {
+        return input.equals("");
+    }
+
+    private static boolean isShout(String input) {
+        final String upperCased = input.toUpperCase();
+        final String lowerCased = input.toLowerCase();
+        final boolean containsSomeLetters = !lowerCased.equals(upperCased);
+        final boolean isAllUpperCase = upperCased.equals(input);
+        return (containsSomeLetters && isAllUpperCase);
+    }
+
+    private static boolean isQuestion(String input) {
+        return input.endsWith("?");
+    }
+}