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POWhen is it beneficial to flyweight Strings in Java?
 

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    <p>I understand the <a href="https://stackoverflow.com/questions/2909848">basic idea</a> of java's String interning, but I'm trying to figure out which situations it happens in, and which I would need to do my own flyweighting.</p> <p>Somewhat related:</p> <ul> <li><a href="https://stackoverflow.com/questions/334518/java-strings-string-s-new-stringsilly">Java Strings: “String s = new String(”silly“);”</a> </li> <li><a href="https://stackoverflow.com/questions/2915511/the-best-alternative-for-string-flyweight-implementation-in-java">The best alternative for String flyweight implementation in Java</a> never quite got answered</li> </ul> <p>Together they tell me that <code>String s = "foo"</code> is good and <code>String s = new String("foo")</code> is bad but there's no mention of any other situations.</p> <p>In particular, if I parse a file (say a csv) that has a lot of repeated values, will Java's string interning cover me or do I need to do something myself? I've gotten conflicting advice about whether or not String interning applies here in my <a href="https://stackoverflow.com/questions/3972127/hashmap-alternatives-for-memory-efficient-data-storage">other question</a></p> <hr> <p>The full answer came in several fragments, so I'll sum up here:</p> <p>By default, java only interns strings that are known at compile-time. <code>String.intern(String)</code> can be used at runtime, but it doesn't perform very well, so it's only appropriate for smaller numbers of <code>String</code>s that you're sure will be repeated <em>a lot</em>. For larger sets of Strings it's Guava to the rescue (see ColinD's answer).</p>
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