Refactoring operation name : extract class

Refactoring object : MakeAlphaNumericToSegment

Reason : makeAlphanumeric, changeAlphaNumericStringToSegment has
independent role.
So, make these function to class(MakeAlphaNumericToSegment).

java/src/main/java/io/nayuki/qrcodegen/MakeAlphaNumericToSegment.java

@@ -0,0 +1,34 @@
+import java.util.Objects;
+
+public class MakeAlphaNumericToSegment implements MakeSegment {
+
+	/**
+	 * Returns a segment representing the specified text string encoded in alphanumeric mode.
+	 * The characters allowed are: 0 to 9, A to Z (uppercase only), space,
+	 * dollar, percent, asterisk, plus, hyphen, period, slash, colon.
+	 * @param text the text (not {@code null}), with only certain characters allowed
+	 * @return a segment (not {@code null}) containing the text
+	 * @throws NullPointerException if the string is {@code null}
+	 * @throws IllegalArgumentException if the string contains non-encodable characters
+	 */
+	public QrSegment excute(String text) {
+		Objects.requireNonNull(text);
+		if (!QrSegment.ALPHANUMERIC_REGEX.matcher(text).matches())
+			throw new IllegalArgumentException("String contains unencodable characters in alphanumeric mode");
+		
+		BitBuffer bitBuffer = new BitBuffer();
+		changeAlphaNumericStringToSegment(text, bitBuffer);
+		return new QrSegment(QrSegment.Mode.ALPHANUMERIC, text.length(), bitBuffer);
+	}
+
+	public static void changeAlphaNumericStringToSegment(String text, BitBuffer bitBuffer) {
+		int i;
+		for (i = 0; i <= text.length() - 2; i += 2) {  // Process groups of 2
+			int temp = QrSegment.ALPHANUMERIC_CHARSET.indexOf(text.charAt(i)) * 45;
+			temp += QrSegment.ALPHANUMERIC_CHARSET.indexOf(text.charAt(i + 1));
+			bitBuffer.appendBits(temp, 11);
+		}
+		if (i < text.length())  // 1 character remaining
+			bitBuffer.appendBits(QrSegment.ALPHANUMERIC_CHARSET.indexOf(text.charAt(i)), 6);
+	}
+}

java/src/main/java/io/nayuki/qrcodegen/QrSegment.java

@@ -49,35 +49,6 @@ public final class QrSegment {
 	
 	/*---- Static factory functions (mid level) ----*/
 	
-	/**
-	 * Returns a segment representing the specified text string encoded in alphanumeric mode.
-	 * The characters allowed are: 0 to 9, A to Z (uppercase only), space,
-	 * dollar, percent, asterisk, plus, hyphen, period, slash, colon.
-	 * @param text the text (not {@code null}), with only certain characters allowed
-	 * @return a segment (not {@code null}) containing the text
-	 * @throws NullPointerException if the string is {@code null}
-	 * @throws IllegalArgumentException if the string contains non-encodable characters
-	 */	
-	public QrSegment makeAlphanumeric(String text) {
-		Objects.requireNonNull(text);
-		if (!QrSegment.ALPHANUMERIC_REGEX.matcher(text).matches())
-			throw new IllegalArgumentException("String contains unencodable characters in alphanumeric mode");
-		
-		BitBuffer bitBuffer = new BitBuffer();
-		changeAlphaNumericStringToSegment(text, bitBuffer);
-		return new QrSegment(QrSegment.Mode.ALPHANUMERIC, text.length(), bitBuffer);
-	}
-
-	public static void changeAlphaNumericStringToSegment(String text, BitBuffer bitBuffer) {
-		int i;
-		for (i = 0; i <= text.length() - 2; i += 2) {  // Process groups of 2
-			int temp = QrSegment.ALPHANUMERIC_CHARSET.indexOf(text.charAt(i)) * 45;
-			temp += QrSegment.ALPHANUMERIC_CHARSET.indexOf(text.charAt(i + 1));
-			bitBuffer.appendBits(temp, 11);
-		}
-		if (i < text.length())  // 1 character remaining
-			bitBuffer.appendBits(QrSegment.ALPHANUMERIC_CHARSET.indexOf(text.charAt(i)), 6);
-	}
 	/**
 	 * Returns a list of zero or more segments to represent the specified Unicode text string.
 	 * The result may use various segment modes and switch modes to optimize the length of the bit stream.