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POReusing code in switch statement (Java)
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  1. POReusing code in switch statement (Java)
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    copied!<p>I would like to use a <code>switch</code> statement, but I am not able to construct it without either duplicating code or using an accompanying <code>if</code> statement. Is there a way around this?</p> <p>I have 5 cases, and for all but one of them I would like to perform a certain action. So with a <code>switch</code> statement, I can just do:</p> <pre><code>switch(x) { case A: foo(); break; case B: case C: case D: case E: bar(); break; } </code></pre> <p>Easy. But the difficulty comes in that I also need to perform another distinct action for each one, so I can't use the fall-through feature of the cases. So I'm reduced to either</p> <pre><code>switch(x) { case A: foo(); baz(0); break; case B: bar(); baz(1); break; case C: bar(); baz(2); break; case D: bar(); baz(3); break; case E: bar(); baz(4); break; } </code></pre> <p>which smells to me because of having to repeat <code>bar()</code> every time, or</p> <pre><code>switch(x) { case A: baz(0); break; case B: baz(1); break; case C: baz(2); break; case D: baz(3); break; case E: baz(4); break; } if (x != A) { bar(); } </code></pre> <p>which doesn't duplicate any code, but it bothers me that there I need to use both <code>switch</code> and <code>if</code>.</p> <p>I guess one other alternative would be to use a map, like</p> <pre><code>Map&lt;X, Integer&gt; m = new HashMap&lt;X, Integer&gt;(); m.put(A, 0); m.put(B, 1); m.put(C, 2); m.put(D, 3); m.put(E, 4); if (m.get(x) == 0) { foo(); } else { bar(); } baz(m.get(x)); </code></pre> <p>but now I've introduced a whole data structure just to clean this up. (And when you count the initialization of the map, it's not even that much cleaner.)</p> <p>Any tips?</p>
 

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