Java: Read an unknown number of properties

I have a Java properties file defined as something like:

Property.1=value1
Property.2=value2
...

There could be any number of properties here.

I am familiar with how to read and use Java Properties, but I am not sure how I would code reading properties when I don't know the number of them. My idea of pseudo-code would be something like:

// Somehow get the number of properties
for (int i开发者_Go百科=0; i<properties.size(); i++ {
   prop.getProperty("Property"+i);
...
}

Does anyone know how to read a variable number of properties?

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If your properties are numbered sequentially as your example suggests:

int i = 1;
String p;
while ((p = prop.getProperty("Property."+i)) != null) {
  // property #i has value p
  i++;
}

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The java.util.Properties class has the ability to load from an input stream.

http://download.oracle.com/javase/6/docs/api/java/util/Properties.html#load%28java.io.InputStream%29

Simply pass a new Properties object the input stream from the file and let it roll.

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You may want to take a look at Commons Collections class ExtendedProperties and it's method subset

That allows you to get all properties with given prefix ('Property.' for example)