Class Design

[nebulom]

Need help with class design. I've got a DataType Class and I need help on making a Collection of this class. Kinda new to Java to please understand. Thanks.

This is DataType class

import java.util.*;
 
public class DataType{
    String sqltype,
        javatype,
        csharptype,
        vbtype;
    public DataType(){
    }
    public DataType(String sqltype,
        String javatype,
        String csharptype,
        String vbtype){
        this.sqltype=sqltype;
        this.javatype=javatype;
        this.csharptype=csharptype;
        this.vbtype=vbtype;
    }
. . .
}

Now I want to make a collection of that class. Something like

import java.util.*;
public class DataTypes extends [i]IDontKnow[/i]{
    public DataTypes(){}
}

where I can return something of type DataType and a public function add for adding of type DataType. Please help. Any recommendations and links for tutorials are greatly appreciated. Thank you.