Re: Class Struktur
In article <hdjq57$sds$1@news.albasani.net>,
Stefan Meyer <devmanfrommars@gmx.de> wrote:
[...]
public class JConfigEntry { ... }
[...]
public static HashMap<String, HashMap> data = new
LinkedHashMap<String, HashMap>();
[...]
JConfigEntry c = new JConfigEntry();
[...]
data.put("sys", c);
[...]
i get alwys this error: cannot find symbol at this line
data.put("sys", c);
Whats wrong ?
Well, data is a HashMap<String, HashMap>, but you're trying to invoke
put with a String and a JConfigEntry. Perhaps you want the variable data
to be a Map <String, JConfigEntry>?
Here's a simple example of a the structure proposed by Joshua Cranmer in
an adjacent thread:
<code>
import java.util.HashMap;
import java.util.Map;
/**
* @author John B. Matthews
*/
public class MapTest {
public static void main(String[] args) {
Map<String, Map<String, String>> map =
new HashMap<String, Map<String, String>>();
Map<String, String> m1 = new HashMap<String, String>();
m1.put("One", "Alpha");
m1.put("Two", "Beta");
map.put("Ordinals", m1);
Map<String, String> m2 = new HashMap<String, String>();
m2.put("One", "Aleph");
m2.put("Two", "Beth");
map.put("Cardinals", m2);
Map<String, String> m3 = new HashMap<String, String>();
m3.put("One", "Alpher");
m3.put("Two", "Bethe");
map.put("Physicists", m3);
printMap(map);
}
private static void printMap(Map<String, Map<String, String>> map) {
for (Map.Entry entry : map.entrySet()) {
System.out.println(entry.getKey() + " " + entry.getValue());
}
System.out.println();
}
}
</code>
<console>
Ordinals {One=Alpha, Two=Beta}
Physicists {One=Alpher, Two=Bethe}
Cardinals {One=Aleph, Two=Beth}
</console>
--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>