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POJava multiline string
 

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    <p>Coming from Perl, I sure am missing the "here-document" means of creating a multi-line string in source code:</p> <pre><code>$string = &lt;&lt;"EOF" # create a three-line string text text text EOF </code></pre> <p>In Java, I have to have cumbersome quotes and plus signs on every line as I concatenate my multiline string from scratch.</p> <p>What are some better alternatives? Define my string in a properties file?</p> <p><strong>Edit</strong>: Two answers say StringBuilder.append() is preferable to the plus notation. Could anyone elaborate as to why they think so? It doesn't look more preferable to me at all. I'm looking for a way around the fact that multiline strings are not a first-class language construct, which means I definitely don't want to replace a first-class language construct (string concatenation with plus) with method calls.</p> <p><strong>Edit</strong>: To clarify my question further, I'm not concerned about performance at all. I'm concerned about maintainability and design issues.</p>
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    1. COStringBuilder.append() is preferable to plus when repeatedly adding to a string because every time you do `string1 + string2` you're allocating a new string object and copying the characters from both of the input strings. If you're adding n Strings together you'd be doing n-1 allocations and approximately (n^2)/2 character copies. StringBuilder, on the other hand, copies and reallocates less frequently (though it still does both when you exceed the size of its internal buffer). Theoretically, there are cases where the compiler could convert + to use StringBuilder but in practice who knows.
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      1. USLaurence Gonsalves
    2. COOops. That part abut the character copies was a bit confused/unclear. Each character gets copied once for every string that comes after it in the concatenation. If all of your strings are one character you get roughly (n^2)/2 character copies. It's really sort of (n^2)/2 string copies, except the later times a string is copied it's copied along with the stuff it's been joined to (but the cost is proprotional to the number of characters, so counting string copies is a bit misleading). Long story short: the cost is roughly quadratic, while StringBuilder tries to make the amortized cost linear.
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    3. COThere's an article on this topic -- I've added a link below, but here it is again: http://java.sun.com/developer/JDCTechTips/2002/tt0305.html
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      1. USPaul Morie
 

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