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    <p>You can use the standard <a href="http://java.sun.com/javase/6/docs/api/java/util/Collections.html#min%28java.util.Collection%29" rel="noreferrer"><code>Collections#min()</code></a> for this.</p> <pre><code>Map&lt;String, Double&gt; map = new HashMap&lt;String, Double&gt;(); map.put("1.1", 1.1); map.put("0.1", 0.1); map.put("2.1", 2.1); Double min = Collections.min(map.values()); System.out.println(min); // 0.1 </code></pre> <p><strong>Update</strong>: since you need the key as well, well, I don't see ways in <a href="http://java.sun.com/javase/6/docs/api/java/util/Collections.html" rel="noreferrer"><code>Collections</code></a> or Google <a href="http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/Collections2.html" rel="noreferrer"><code>Collections2</code></a> API since a <code>Map</code> is not a <code>Collection</code>. The <a href="http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/Maps.html#filterEntries%28java.util.Map,%20com.google.common.base.Predicate%29" rel="noreferrer"><code>Maps#filterEntries()</code></a> is also not really useful, since you only know the actual result at <em>end</em> of iteration.</p> <p>Most straightforward solution would then be this:</p> <pre><code>Entry&lt;String, Double&gt; min = null; for (Entry&lt;String, Double&gt; entry : map.entrySet()) { if (min == null || min.getValue() &gt; entry.getValue()) { min = entry; } } System.out.println(min.getKey()); // 0.1 </code></pre> <p>(nullcheck on <code>min</code> left aside)</p>
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    1. POGet minvalue of a Map(Key,Double)
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    1. COThanks for the answer - I forgot to mention that I need the key of the min value
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    2. COThanks a lot, by the way, I would also need to get ranks of a sorted map. I would like to use the index as rank (1,2,3...) What might be the best way to do this with maps as here its not possible to obtain the index. It is rather inconvinient to create a list from the map each time
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    3. COIf you want an index, you'll really need to use a `List<SomeObject>` instead in combination with a suitable `Comparator<SomeObject>` or maybe `Comparable<SomeObject>`. The `SomeObject` in turn can then hold the original map key and value. A `Set<SomeObject>` may also be suitable, you'll only count the index yourself.
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