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copied!<p><a href="http://java.sun.com/javase/6/docs/api/java/util/Properties.html" rel="noreferrer"><code>Properties</code></a> is a very specialized class that's designed to hold configuration and/or resources that are usually stored in some file.</p> <p>It has several features that <code>Hashtable</code> doesn't have (and shouldn't have):</p> <ul> <li>It supports reading and writing its content to a well-defined plain-text format (using <a href="http://java.sun.com/javase/6/docs/api/java/util/Properties.html#load(java.io.InputStream)" rel="noreferrer"><code>load()</code></a>/<a href="http://java.sun.com/javase/6/docs/api/java/util/Properties.html#store(java.io.OutputStream,%20java.lang.String)" rel="noreferrer"><code>store()</code></a>)</li> <li>It supports reading and writing its content to a well-defined XML-based format (using <a href="http://java.sun.com/javase/6/docs/api/java/util/Properties.html#loadFromXML(java.io.InputStream)" rel="noreferrer"><code>loadFromXML()</code></a>/<a href="http://java.sun.com/javase/6/docs/api/java/util/Properties.html#storeToXML(java.io.OutputStream,%20java.lang.String)" rel="noreferrer"><code>storeToXML()</code></a>)</li> <li>It supports a default mechanism <a href="http://java.sun.com/javase/6/docs/api/java/util/Properties.html#Properties(java.util.Properties)" rel="noreferrer">by providing another <code>Properties</code> instance at construction time</a>.</li> <li>It only supports <code>String</code> keys and values. While it is technically a <code>Map<Object,Object></code> actually storing non-<code>String</code> keys or values is strongly discouraged and unsupported.</li> </ul> <p>A <a href="http://java.sun.com/javase/6/docs/api/java/util/Hashtable.html" rel="noreferrer"><code>Hashtable</code></a> on the other hand is a general-purpose <a href="http://java.sun.com/javase/6/docs/api/java/util/Map.html" rel="noreferrer"><code>Map</code></a> implementation (which is mostly replaced by the <a href="http://java.sun.com/javase/6/docs/api/java/util/HashMap.html" rel="noreferrer"><code>HashMap</code></a>, however).</p>

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