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POChained invocation in Java 7?
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copied!<p>I was just reading a <a href="http://puredanger.com/techfiles/090204/Java7Preview.pdf" rel="nofollow noreferrer">Java 7 preview presentation (pdf)</a> and there was a slide on <em>Chained Invocation</em>. Here is the example used in the slide:</p> <pre><code>// Construction with setters DrinkBuilder margarita = new DrinkBuilder(); margarita.add("tequila"); margarita.add("orange liqueur"); margarita.add("lime juice"); margarita.withRocks(); margarita.withSalt(); Drink drink = margarita.drink(); // Construction with chained invocation Drink margarita = new DrinkBuilder() .add("tequila") .add("orange liqueur") .add("lime juice") .withRocks() .withSalt() .drink(); </code></pre> <p>And I have mixed feelings about this. One shouldn't chain too many method invocations into one statement. On the other hand, writing <code>margarita.this()</code> and <code>margarita.that()</code> isn't too convenient either.</p> <p>Now, I am coming to Java from Delphi world. And in Delphi there is the <a href="http://www.delphibasics.co.uk/RTL.asp?Name=With" rel="nofollow noreferrer"><code>with</code></a> language construct. This is cherished by a few and loathed by many (or is it the other way around?). I find <code>with</code> to be more elegant than the idea of chained invocation (which I believe works on the basis of <code>void</code> method returning reference to object on which it has been invoked - and this is the part I don't like, as <code>void</code> should return <em>nothing</em>).</p> <p>I would appreciate the <code>with</code> language feature being adopted by Java, so the example code could be written like so:</p> <pre><code>Drink margarita = null; with (new DrinkBuilder()) { add("tequila"); add("orange liqueur"); add("lime juice"); withRocks(); withSalt(); margarita = drink(); } </code></pre> <p>Am I the only one who would prefer this solution to the chained invocation? Anyone else feels that <code>with</code> could be a useful extension to Java language? (Reminds me of someone's question about the need of "Java++"...)</p>

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