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    <p>Use a <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/TreeMap.html" rel="noreferrer"><code>TreeMap</code></a>, which is an implementation of the <code>SortedMap</code> interface. It presents its keys in sorted order.</p> <pre><code>Map&lt;String, Object&gt; map = new TreeMap&lt;String, Object&gt;(); /* Add entries to the map in any order. */ ... /* Now, iterate over the map's contents, sorted by key. */ for (Map.Entry&lt;String, ?&gt; entry : map.entrySet()) { System.out.println(entry.getKey() + ": " + entry.getValue()); } </code></pre> <p>If you are working with another Map implementation that isn't sorted as you like, you can pass it to the <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/TreeMap.html#TreeMap(java.util.Map)" rel="noreferrer">constructor</a> of <code>TreeMap</code> to create a new map with sorted keys.</p> <pre><code>void process(Map&lt;String, Object&gt; original) { Map&lt;String, Object&gt; copy = new TreeMap&lt;String, Object&gt;(original); /* Now use "copy", which will have keys in sorted order. */ ... } </code></pre> <p>A <code>TreeMap</code> works with any type of key that implements the <code>Comparable</code> interface, putting them in their "natural" order. For keys that aren't <code>Comparable</code>, or whose natural ordering isn't what you need, you can implement your own <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Comparator.html" rel="noreferrer"><code>Comparator</code></a> and specify that in the <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/TreeMap.html#TreeMap(java.util.Comparator)" rel="noreferrer">constructor</a>.</p>
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    1. POHow can I sort the keys of a Map in Java?
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    1. COThe code I'm consuming gives me a Map object, so how do I then convert it into a TreeMap or use a TreeMap to do the sorting?
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      1. USBialecki
    2. COYou can create the TreeMap using a constructor whose parameter is any Map. Also, congratulations erickson (I assume, since you're only 5 rep away from 10k).
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      1. USDaniel Lew
    3. CODing! erickson levels up.
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