Convert 20_Buzzword to Java

The original version was a straight forward monolithic BASIC-to-Java
conversion. Updated to use common Java coding conventions.

 - Split the single static main method into classes. The static part
   only contains the bootstrap code for the game.
 - Split the word list into three arrays so that there is no need to
   use error-prone calculations when choosing the random words.
 - Placed the Scanner in a try-with-resources block to ensure that the
   scanner gets closed when it is no longer needed.

20_Buzzword/java/src/Buzzword.java

@@ -1,41 +1,17 @@
 import java.util.Scanner;
-import static java.lang.System.out;
 
-// This is very close to the original BASIC. Changes:
-// 1) the array indexing is adjusted by 1
-// 2) the user can enter a lower case "y"
-// 3) moved the word list to the top 8~)
 public class Buzzword {
-	private static final String[] A = {
-		"ABILITY","BASAL","BEHAVIORAL","CHILD-CENTERED",
-		"DIFFERENTIATED","DISCOVERY","FLEXIBLE","HETEROGENEOUS",
-		"HOMOGENEOUS","MANIPULATIVE","MODULAR","TAVISTOCK",
-		"INDIVIDUALIZED","LEARNING","EVALUATIVE","OBJECTIVE",
-		"COGNITIVE","ENRICHMENT","SCHEDULING","HUMANISTIC",
-		"INTEGRATED","NON-GRADED","TRAINING","VERTICAL AGE",
-		"MOTIVATIONAL","CREATIVE","GROUPING","MODIFICATION",
-		"ACCOUNTABILITY","PROCESS","CORE CURRICULUM","ALGORITHM",
-		"PERFORMANCE","REINFORCEMENT","OPEN CLASSROOM","RESOURCE",
-		"STRUCTURE","FACILITY","ENVIRONMENT"
-	};
-	private static Scanner scanner = new Scanner( System.in );
 
-	public static void main( final String [] args ) {
-		out.println( "              BUZZWORD GENERATOR" );
-		out.println( "   CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY" );
-		out.println();out.println();out.println();
-		out.println( "THIS PROGRAM PRINTS HIGHLY ACCEPTABLE PHRASES IN" );
-		out.println( "'EDUCATOR-SPEAK' THAT YOU CAN WORK INTO REPORTS" );
-		out.println( "AND SPEECHES.  WHENEVER A QUESTION MARK IS PRINTED," );
-		out.println( "TYPE A 'Y' FOR ANOTHER PHRASE OR 'N' TO QUIT." );
-		out.println();out.println();out.println( "HERE'S THE FIRST PHRASE:" );
-		do {
-			out.print( A[ (int)( 13 * Math.random() ) ] + " " );
-			out.print( A[ (int)( 13 * Math.random() + 13 ) ] + " " );
-			out.print( A[ (int)( 13 * Math.random() + 26 ) ] ); out.println();
-			out.print( "?" );
+	public static void main(final String[] args) {
+		try (
+			// Scanner is a Closeable so it must be closed
+			// before the program ends.
+			final Scanner scanner = new Scanner(System.in);
+		) {
+			final BuzzwordSupplier buzzwords = new BuzzwordSupplier();
+			final UserInterface userInterface = new UserInterface(
+					scanner, buzzwords);
+			userInterface.run();
 		}
-		while ( "Y".equals( scanner.nextLine().toUpperCase() ) );
-		out.println( "COME BACK WHEN YOU NEED HELP WITH ANOTHER REPORT!" );
 	}
 }

20_Buzzword/java/src/BuzzwordSupplier.java

@@ -0,0 +1,39 @@
+import java.util.Random;
+import java.util.function.Supplier;
+
+/**
+ * A string supplier that provides an endless stream of random buzzwords.
+ */
+public class BuzzwordSupplier implements Supplier<String> {
+
+	private static final String[] SET_1 = {
+			"ABILITY","BASAL","BEHAVIORAL","CHILD-CENTERED",
+			"DIFFERENTIATED","DISCOVERY","FLEXIBLE","HETEROGENEOUS",
+			"HOMOGENEOUS","MANIPULATIVE","MODULAR","TAVISTOCK",
+			"INDIVIDUALIZED" };
+
+	private static final String[] SET_2 = {
+			"LEARNING","EVALUATIVE","OBJECTIVE",
+			"COGNITIVE","ENRICHMENT","SCHEDULING","HUMANISTIC",
+			"INTEGRATED","NON-GRADED","TRAINING","VERTICAL AGE",
+			"MOTIVATIONAL","CREATIVE" };
+
+	private static final String[] SET_3 = {
+			"GROUPING","MODIFICATION", "ACCOUNTABILITY","PROCESS",
+			"CORE CURRICULUM","ALGORITHM", "PERFORMANCE",
+			"REINFORCEMENT","OPEN CLASSROOM","RESOURCE", "STRUCTURE",
+			"FACILITY","ENVIRONMENT" };
+
+	private final Random random = new Random();
+
+	/**
+	 * Create a buzzword by concatenating a random word from each of the
+	 * three word sets.
+	 */
+	@Override
+	public String get() {
+		return SET_1[random.nextInt(SET_1.length)] + ' ' +
+				SET_2[random.nextInt(SET_2.length)] + ' ' +
+				SET_3[random.nextInt(SET_3.length)];
+	}
+}

20_Buzzword/java/src/UserInterface.java

@@ -0,0 +1,57 @@
+import static java.lang.System.out;
+
+import java.util.Scanner;
+import java.util.function.Supplier;
+
+/**
+ * A command line user interface that outputs a buzzword every
+ * time the user requests a new one.
+ */
+public class UserInterface implements Runnable {
+
+	/**
+	 * Input from the user.
+	 */
+	private final Scanner input;
+
+	/**
+	 * The buzzword generator.
+	 */
+	private final Supplier<String> buzzwords;
+
+	/**
+	 * Create a new user interface.
+	 *
+	 * @param input The input scanner with which the user gives commands.
+	 * @param buzzwords The buzzword supplier.
+	 */
+	public UserInterface(final Scanner input,
+		final Supplier<String> buzzwords) {
+		this.input = input;
+		this.buzzwords = buzzwords;		
+	}
+
+	@Override
+	public void run() {
+		out.println("              BUZZWORD GENERATOR");
+		out.println("   CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY");
+		out.println();
+		out.println();
+		out.println();
+		out.println("THIS PROGRAM PRINTS HIGHLY ACCEPTABLE PHRASES IN");
+		out.println("'EDUCATOR-SPEAK' THAT YOU CAN WORK INTO REPORTS");
+		out.println("AND SPEECHES.  WHENEVER A QUESTION MARK IS PRINTED,");
+		out.println("TYPE A 'Y' FOR ANOTHER PHRASE OR 'N' TO QUIT.");
+		out.println();
+		out.println();
+		out.println("HERE'S THE FIRST PHRASE:");
+
+		do {
+			out.println(buzzwords.get());
+			out.println();
+			out.print("?");
+		} while ("Y".equals(input.nextLine().toUpperCase()));
+
+		out.println("COME BACK WHEN YOU NEED HELP WITH ANOTHER REPORT!");
+	}
+}