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    <p>If you want that specific control over formatting, you have to do it to each item individually. There is <code>Arrays.toString()</code>, but it provides no control over individual elements.</p> <p>If you are printing multiple arrays and you want their output to "line up", you will need to choose output formats so that happens, e.g.:</p> <pre><code> float data1[] = new float[] { 1, 2.5f, 30, 4.56f, 5 }; int data2[] = new int[] { 1, 22, 33, -4, 5 }; for (float f:data1) System.out.printf("%6.2f ", f); System.out.println(); for (int n:data2) System.out.printf("%3d ", n); System.out.println(); </code></pre> <p>Which outputs:</p> <pre><code> 1.00 2.50 30.00 4.56 5.00 1 22 33 -4 5 </code></pre> <p>That example might not be the precise format you are going for, but the point is, you have control this way. If you want to do left-aligned numbers, wider fields, if your types are Strings or floats or doubles or ints, etc.</p> <p>Sometimes it helps to work out field widths and padding spaces in e.g. a text editor or on paper first. E.g. with the above, where we try to line up decimal points and digits between floats and integers, I like to first work out the format in a fixed-width editor (like in a comment or in notepad), e.g.:</p> <pre><code>FFF.FF FFF.FF FFF.FF FFF.FF III III III III </code></pre> <p>Then you can more easily see how that translates to format specifiers:</p> <ul> <li><code>FFF.FF&nbsp;</code> is <code>"%6.2f&nbsp;"</code>.</li> <li><code>III&nbsp;&nbsp;&nbsp;&nbsp;</code> is <code>"%3d&nbsp;&nbsp;&nbsp;&nbsp;"</code>.</li> </ul> <p>See the documentation for <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html" rel="nofollow"><code>Formatter</code></a> for more information about the format codes you can pass to <code>System.out.printf()</code>.</p>
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    1. POHow to format an array with printf() in Java?
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    1. USJason C
    1. USJason C
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    1. CODid you see the for-loop in the question?
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      1. USSimon Forsberg
    2. CO@SimonAndréForsberg I think "how can I format the whole array once with a single System.out.printf()" is asking "Is there a way to get rid of the for loop?"
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      1. USajb
    3. CO@ajb Ah, then I either misunderstood the question or the answer (or possibly both). Thanks for clarification. Retracted my downvote.
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      1. USSimon Forsberg
 

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