diff --git a/java/io/nayuki/qrcodegen/QrCodeGeneratorWorker.java b/java/io/nayuki/qrcodegen/QrCodeGeneratorWorker.java
index b23f8e1..e9d7ecc 100644
--- a/java/io/nayuki/qrcodegen/QrCodeGeneratorWorker.java
+++ b/java/io/nayuki/qrcodegen/QrCodeGeneratorWorker.java
@@ -38,62 +38,66 @@ public final class QrCodeGeneratorWorker {
 	
 	public static void main(String[] args) {
 		// Set up input stream and start loop
-		Scanner input = new Scanner(System.in, "US-ASCII");
-		input.useDelimiter("\r\n|\n|\r");
-		while (true) {
-			
-			// Read data length or exit
-			int length = input.nextInt();
-			if (length == -1)
-				break;
-			if (length > Short.MAX_VALUE)
-				throw new RuntimeException();
-			
-			// Read data bytes
-			boolean isAscii = true;
-			byte[] data = new byte[length];
-			for (int i = 0; i < data.length; i++) {
-				int b = input.nextInt();
-				if (b < 0 || b > 255)
-					throw new RuntimeException();
-				data[i] = (byte)b;
-				isAscii &= b < 128;
-			}
-			
-			// Read encoding parameters
-			int errCorLvl  = input.nextInt();
-			int minVersion = input.nextInt();
-			int maxVersion = input.nextInt();
-			int mask       = input.nextInt();
-			int boostEcl   = input.nextInt();
-			if (!(0 <= errCorLvl && errCorLvl <= 3) || !(-1 <= mask && mask <= 7) || (boostEcl >>> 1) != 0
-					|| !(QrCode.MIN_VERSION <= minVersion && minVersion <= maxVersion && maxVersion <= QrCode.MAX_VERSION))
-				throw new RuntimeException();
-			
-			// Make segments for encoding
-			List<QrSegment> segs;
-			if (isAscii)
-				segs = QrSegment.makeSegments(new String(data, StandardCharsets.US_ASCII));
-			else
-				segs = Arrays.asList(QrSegment.makeBytes(data));
-			
-			
-			try {  // Try to make QR Code symbol
-				QrCode qr = QrCode.encodeSegments(segs, QrCode.Ecc.values()[errCorLvl], minVersion, maxVersion, mask, boostEcl != 0);
-				// Print grid of modules
-				System.out.println(qr.version);
-				for (int y = 0; y < qr.size; y++) {
-					for (int x = 0; x < qr.size; x++)
-						System.out.println(qr.getModule(x, y) ? 1 : 0);
-				}
-				
-			} catch (IllegalArgumentException e) {
-				if (!e.getMessage().equals("Data too long"))
-					throw e;
-				System.out.println(-1);
-			}
-			System.out.flush();
+		try (Scanner input = new Scanner(System.in, "US-ASCII")) {
+			input.useDelimiter("\r\n|\n|\r");
+			while (processCase(input));
 		}
 	}
 	
+	
+	private static boolean processCase(Scanner input) {
+		// Read data length or exit
+		int length = input.nextInt();
+		if (length == -1)
+			return false;
+		if (length > Short.MAX_VALUE)
+			throw new RuntimeException();
+		
+		// Read data bytes
+		boolean isAscii = true;
+		byte[] data = new byte[length];
+		for (int i = 0; i < data.length; i++) {
+			int b = input.nextInt();
+			if (b < 0 || b > 255)
+				throw new RuntimeException();
+			data[i] = (byte)b;
+			isAscii &= b < 128;
+		}
+		
+		// Read encoding parameters
+		int errCorLvl  = input.nextInt();
+		int minVersion = input.nextInt();
+		int maxVersion = input.nextInt();
+		int mask       = input.nextInt();
+		int boostEcl   = input.nextInt();
+		if (!(0 <= errCorLvl && errCorLvl <= 3) || !(-1 <= mask && mask <= 7) || (boostEcl >>> 1) != 0
+				|| !(QrCode.MIN_VERSION <= minVersion && minVersion <= maxVersion && maxVersion <= QrCode.MAX_VERSION))
+			throw new RuntimeException();
+		
+		// Make segments for encoding
+		List<QrSegment> segs;
+		if (isAscii)
+			segs = QrSegment.makeSegments(new String(data, StandardCharsets.US_ASCII));
+		else
+			segs = Arrays.asList(QrSegment.makeBytes(data));
+		
+		
+		try {  // Try to make QR Code symbol
+			QrCode qr = QrCode.encodeSegments(segs, QrCode.Ecc.values()[errCorLvl], minVersion, maxVersion, mask, boostEcl != 0);
+			// Print grid of modules
+			System.out.println(qr.version);
+			for (int y = 0; y < qr.size; y++) {
+				for (int x = 0; x < qr.size; x++)
+					System.out.println(qr.getModule(x, y) ? 1 : 0);
+			}
+			
+		} catch (IllegalArgumentException e) {
+			if (!e.getMessage().equals("Data too long"))
+				throw e;
+			System.out.println(-1);
+		}
+		System.out.flush();
+		return true;
+	}
+	
 }