Simplified code to use StringBuilder method chaining.

src/io/nayuki/fastqrcodegen/QrCode.java

@@ -209,14 +209,13 @@ public final class QrCode {
 		if (size + border * 2L > Integer.MAX_VALUE)
 			throw new IllegalArgumentException("Border too large");
 		
-		StringBuilder sb = new StringBuilder();
-		sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
-		sb.append("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n");
-		sb.append(String.format(
-			"<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 %1$d %1$d\" stroke=\"none\">\n",
-			size + border * 2));
-		sb.append("\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n");
-		sb.append("\t<path d=\"");
+		StringBuilder sb = new StringBuilder()
+			.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
+			.append("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n")
+			.append(String.format("<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 %1$d %1$d\" stroke=\"none\">\n",
+				size + border * 2))
+			.append("\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n")
+			.append("\t<path d=\"");
 		boolean head = true;
 		for (int y = 0; y < size; y++) {
 			for (int x = 0; x < size; x++) {
@@ -229,9 +228,10 @@ public final class QrCode {
 				}
 			}
 		}
-		sb.append("\" fill=\"#000000\"/>\n");
-		sb.append("</svg>\n");
-		return sb.toString();
+		return sb
+			.append("\" fill=\"#000000\"/>\n")
+			.append("</svg>\n")
+			.toString();
 	}