my program.java uses unchecked or unsafe operations

Note: solutions/mud/Bag.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.


Can anyone tell me what I did wrong?


import java.util.Map;
import java.util.HashMap;
import java.util.List;
import java.util.Vector;
import java.util.Iterator;
import java.io.Serializable;

// Represents a location in the MUD (a vertex in the graph).
class Bag implements Serializable
{


    public HashMap bag = new HashMap();
    
    public void add( String user, String thing )
    {
	    
	    bag.put(user, thing);
	   
    }


}

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static86Asked:
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objectsCommented:
try this:

    public HashMap bag = new HashMap();
   
    public void add( String user, String thing )
    {
           
            bag.put(user, thing);
           
    }
0

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objectsCommented:
the error is saying you haven't specified the type of objects that will be stored in the map
0
static86Author Commented:
thx:)!
0
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