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    <p>The first of the two you specify is a classic C <code>for</code> loop. This gives the programmer control over the iteration criteria and allows for three operations: the initialization; the loop test ; the increment expression. Though it is used often to incrementally repeat for a set number of attempts, as in yor example:</p> <pre><code>for (int i=0; i &lt; N : i++) </code></pre> <p>There are many more instances in code where the <code>for</code> was use to iterate over collections: </p> <pre><code>for (Iterator iter = myList.iterator(); iter.hasNext();) </code></pre> <p>To aleviate the boilerplating of the second type (where the third clause was often unused), and to compliment the <a href="http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf" rel="noreferrer">Generics</a> introduced in Java 1.5, the second of your two examples - the enhanced for loop, or the <a href="http://java.sun.com/j2se/1.5.0/docs/guide/language/foreach.html" rel="noreferrer"><code>for-each loop</code></a> - was introduced. </p> <p>The second is used with arrays and Generic collections. <a href="http://java.sun.com/developer/JDCTechTips/2005/tt0505.html#2" rel="noreferrer">See this documentation</a>. It allows you to iterate over a generic collection, where you know the type of the <code>Collection</code>, without having to cast the result of the <code>Iterator.next()</code> to a known type.</p> <p>Compare:</p> <pre><code>for(Iterator iter = myList.iterator; iter.hasNext() ; ) { String myStr = (String) iter.next(); //...do something with myStr } </code></pre> <p>with </p> <pre><code>for (String myStr : myList) { //...do something with myStr } </code></pre> <p>This 'new style' for loop can be used with arrays as well:</p> <pre><code>String[] strArray= ... for (String myStr : strArray) { //...do something with myStr } </code></pre>
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    1. COOr array. Or regular collection if your variable is of type Object :-)
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    2. COIt is not exclusive to generic collections.
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    3. CO@pavel - i am willing to make this a wiki answer if you want to add more to it.
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