Class Struktur

[Stefan Meyer]

hello, i want to add a calss to a hass

The Dataclass is this

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package my.config;

/**
*
* @author smiefert
*/
public class JConfigEntry {

Integer CID;
String ckey, cvalue, cdescription;

// Alles löschen
public void clear() {
this.setCID(0);
this.setCkey("");
this.setCvalue("");
this.setCdescription("");
}

// Setter
public void setCID(Integer CID) {
this.CID = CID;
}

public void setCkey(String ckey) {
this.ckey = ckey;
}

public void setCvalue(String cvalue) {
this.cvalue = cvalue;
}

public void setCdescription(String cdescription) {
this.cdescription = cdescription;
}

// Getter
public Integer getCID() {
return this.CID;
}

public String getCkey() {
return this.ckey;
}

public String getCvalue() {
return this.cvalue;
}

public String getCdescription() {
return this.cdescription;
}
}


and i call it here

public class JConfig {
// public Collection c = new LinkedList();
// public Collection c = new ArrayList();
// public Collection c = new LinkedList();
// public Collection c = new HashSet();
// public HashMap c = new HashMap ();
// public HashMap c = new LinkedHashMap ();
// public ArrayList data = new ArrayList();

// public static ArrayList<HashMap<String, String>> data = new
ArrayList<HashMap<String, String>>();
public static HashMap<String, HashMap> data = new
LinkedHashMap<String, HashMap>();


public void JConfig() {
String strSQL = "";
JDb db = new JDb();
db.ConnectDb();
strSQL = "SELECT " +
" CID, " +
" ckey," +
" cvalue," +
" cdescription " +
"FROM " +
" config " +
"ORDER BY " +
" ckey";
db.makeQuery(strSQL);
try {
while (db.rs.next()) {
JConfigEntry c = new JConfigEntry();
c.setCID(db.rs.getInt("CID"));
c.setCkey(db.rs.getString("ckey"));
c.setCvalue(db.rs.getString("cvalue"));
c.setCdescription(db.rs.getString("cdescription"));

data.put("sys", c);
}
} catch (SQLException e) {
System.out.println("SQL Exception: " + e.toString());
}

// Einzelwert
HashMap item = (HashMap) data.get(0);
System.out.println("Einzelwerttest: " +item.get(""));

// ALle Werte ausgeben
for (HashMap<String, HashMap> c : data) {
for (String key : c.keySet()) {
System.out.println(key + ": " + c.get(key));
}
}

}
}

i get alwys this error: cannot find symbol at this line

data.put("sys", c);


Whats wrong ?

 

[John B. Matthews]

[...]

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>

 

[Lew]

hello, i [sic] want to add a calss to a hass

Watch your spelling.

...
public class JConfig {
     public static HashMap<String, HashMap> data = new
LinkedHashMap<String, HashMap>();
...
         try {
             while (db.rs.next()) {
                 JConfigEntry c = new JConfigEntry();
                 c.setCID(db.rs.getInt("CID"));
                 c.setCkey(db.rs.getString("ckey"));
                 c.setCvalue(db.rs.getString("cvalue"));
                 c.setCdescription(db.rs.getString("cdescription"));

                 data.put("sys", c);
             }
         } catch (SQLException e) {
             System.out.println("SQL Exception: " + e.toString());
         }
...
i [sic] get alwys this error: cannot find symbol at this line

Copy and paste error messages for Usenet posts; don't paraphrase.

data.put("sys", c);

Whats wrong ?

Many things are wrong, but in particular for the error about which you
ask, 'data' is defined as a
'HashMap<String, HashMap> ' (which lacks complete generic
typification), but you are calling put with a
'( String, JConfigEntry )' argument pair. There is not a definition
for the symbol 'put( String, JConfigEntry )' so the compiler complains
that it cannot find that symbol.

 

[Roedy Green]

public static HashMap<String, HashMap> data = new LinkedHashMap<String, HashMap>();
JConfigEntry c = new JConfigEntry();
data.put("sys", c);

Those are the three relevant lines.

You redefine things so often, I think you have tripped over yourself.
Make up your mind what sort of animal data is.
Is it a HashMap<String, HashMap> or a HashMap<String, JConfigEntry>?

Some general thoughts:

It is unusual to only partially use generics. Maybe you meant
something on the order of

HashMap<String, HashMap<String, JConfigEntry>>

It is unusual to have a HashMap of HashMaps. You could get much the
same effect with a single HashMap with a two-field key object that
implements hash, and equals.

--
Roedy Green Canadian Mind Products
http://mindprod.com

Without deviation from the norm, progress is not possible.
~ Frank Zappa (born: 1940-12-21 died: 1993-12-04 at age: 52)