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MAP of multiple datatypes
Posted on 2009-04-03
Hi,
I'm new to JAVA and I'm trying to achieve something that the JAVA Map seems to be the solution for, but I'm hitting a wall. Basically I want to have a MAP of values BUT with different data types. That doesn't work (maybe I'm doing something wrong) as it asks me to declare the Map parameterized.
Below is a sample snippet of what I want to do.
Note: I know I can use the Memento pattern to achieve this, but I'm wondering if this is at all possible.
I'm new to JAVA and I'm trying to achieve something that the JAVA Map seems to be the solution for, but I'm hitting a wall. Basically I want to have a MAP of values BUT with different data types. That doesn't work (maybe I'm doing something wrong) as it asks me to declare the Map parameterized.
Below is a sample snippet of what I want to do.
Note: I know I can use the Memento pattern to achieve this, but I'm wondering if this is at all possible.
public class MyClass{
protected Map instance;
public void setName( String sName ){
this.instance.put("sName",sName);
}
public void setDate(Date date){
this.instance.put("date", date)
}
public Map getInstanceState(){
return Collections.unmodifiableMap(this.instance);
}
}
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2
3 Comments
Why not just use a HashMap? (Attached is an example)
import java.util.HashMap;
public class Ex
{
public Ex()
{
HashMap hm=new HashMap();
hm.put("sn","InteractiveMind");
hm.put("size",new Integer(200));
}
public static void main(String[]a)
{new Ex();}
}
Thank you, that works! The compiler (Eclipse) still throws a warning saying the HashMap should be parameterized but it works well.
final snippet:
final snippet:
protected HashMap inst = new HashMap();
/*
* Get the state of the object properties at a specific moment
*
* @return unmodifiable SortedMap (memento of object)
*/
public Map getMemento(){
return Collections.unmodifiableSortedMap( new TreeMap(this.inst) );
}
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