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    <p>I think this is pretty straight-forward:</p> <pre><code>public static void main(String... args) throws IOException { ArrayList&lt;ArrayList&lt;String&gt;&gt; rows = getRandomData(); if (rows.size() == 0) throw new RuntimeException("No rows"); // normalize data int longest = 0; for (List&lt;String&gt; row : rows) if (row.size() &gt; longest) longest = row.size(); for (List&lt;String&gt; row : rows) while (row.size() &lt; longest) row.add(""); if (longest == 0) throw new RuntimeException("No colums"); // fix special characters for (int i = 0; i &lt; rows.size(); i++) for (int j = 0; j &lt; rows.get(i).size(); j++) rows.get(i).set(j, fixSpecial(rows.get(i).get(j))); // get the maximum size of one column int[] maxColumn = new int[rows.get(0).size()]; for (int i = 0; i &lt; rows.size(); i++) for (int j = 0; j &lt; rows.get(i).size(); j++) if (maxColumn[j] &lt; rows.get(i).get(j).length()) maxColumn[j] = rows.get(i).get(j).length(); // create the format string String outFormat = ""; for (int max : maxColumn) outFormat += "%-" + (max + 1) + "s, "; outFormat = outFormat.substring(0, outFormat.length() - 2) + "\n"; // print the data for (List&lt;String&gt; row : rows) System.out.printf(outFormat, row.toArray()); } private static String fixSpecial(String s) { s = s.replaceAll("(\")", "$1$1"); if (s.contains("\n") || s.contains(",") || s.contains("\"") || s.trim().length() &lt; s.length()) { s = "\"" + s + "\""; } return s; } private static ArrayList&lt;ArrayList&lt;String&gt;&gt; getRandomData() { ArrayList&lt;ArrayList&lt;String&gt;&gt; data = new ArrayList&lt;ArrayList&lt;String&gt;&gt;(); String[] rand = { "Do", "Re", "Song", "David", "Test", "4", "Hohjoh", "a \"h\" o", "tjo,ad" }; Random r = new Random(5); for (int i = 0; i &lt; 10; i++) { ArrayList&lt;String&gt; row = new ArrayList&lt;String&gt;(); for (int j = 0; j &lt; r.nextInt(10); j++) row.add(rand[r.nextInt(rand.length)]); data.add(row); } return data; } </code></pre> <p>Output (pretty ugly since its random) (<a href="http://en.wikipedia.org/wiki/Comma-separated_values" rel="nofollow">escapes</a>):</p> <pre><code>Re , 4 , "tjo,ad" , "tjo,ad" , "tjo,ad" , "a ""h"" o" , , , Re , "a ""h"" o" , Hohjoh , "tjo,ad" , 4 4 , David , , , 4 , Test , "tjo,ad" , Hohjoh , Re Do , Hohjoh , Test , , Hohjoh , Song , , , 4 , Song , , , 4 , Do , Song , Do , Song , Test , Test , , </code></pre>
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    1. POIs there an easy way to output a column-wise CSV?
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    1. POIs there an easy way to output a column-wise CSV?
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    1. COThis is essentially what I had coded, but the pre-normalizing bit is interesting. It means I only need to check N times instead of N^2 times. Thanks!
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    2. COand what if the string contains a comma?
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    3. CO@peter.murray.rust: fixed now, the previous implementation only fixed the column width, now it adds commas aswell (and "escapes" the special characters - [\n|\"|,])
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