Sams Teach Yourself Java™ in 24 Hours (Covering Java 7 and Android)

ptg7068951

Reading an XML File 305

This approach doesn’t work when several elements share the same name,
as the forecastdayelement does. For those, you can retrieve all the ele-
ments and loop through them with a forloop:

Elements days = root.getChildElements(“simpleday”);
for(int current = 0; current < days.size(); current++) {
Element day = days.get(current);
}

This program does not make use of attributes, but an element’s attribute
can be accessed with the getAttribute()method, which takes the
attribute’s name as an argument:

Attribute key = day.getAttribute(“key”);

When you have the attribute, its getValue()method reveals the matching
value:

String keyValue = key.getValue();

Create a new empty Java file calledWeatherStationand enter the text
from Listing 21.3 into the file.

LISTING 21.3 The Full Text of WeatherStation.java
1: importjava.io.;
2: importnu.xom.;
3:
4: public classWeatherStation {
5: int[] highTemp= new int[6];
6: int[] lowTemp= new int[6];
7: String[] conditions= new String[6];
8:
9: publicWeatherStation() throwsParsingException, IOException {
10: // get the XML document
11: Builder builder = new Builder();
12: Document doc = builder.build(“http://tinyurl.com/rd4r72”);
13: // get the root element,
14: Element root = doc.getRootElement();
15: // get the element
16: Element simple = root.getFirstChildElement(“simpleforecast”);
17: // get the elements
18: Elements days = simple.getChildElements(“forecastday”);
19: for (int current = 0; current < days.size(); current++) {
20: // get current
21: Element day = days.get(current);
22: // get current
23: Element high = day.getFirstChildElement(“high”);
24: Element highF = high.getFirstChildElement(“fahrenheit”);
25: // get current