Help with the logic

[Ankur Luthra]

Hi,
I am working on a problem where in I have 2 Maps with key ,value as String and Object containing all the attributes for the class.
Now some elements in both the maps can be same.
Some can be present in one Map and not in second.
Some can be present in second Map and not in first Map.
The problem is to compare both the Maps.

The logic I am using is.
Take a temp Set say "traversed"
a)Iterate on Map 1.
b)Get the key and

if(traversed.add(key))
{
if (null!=Map2.get(key))
{
Get the values and do something
}
}

c)So traversed set has all the elements present in Map1
d)Iterate on map2
e)Get the key and

if(traversed.add(key))
{
if (null!=map1.get(key))
{
Get the values and do something
}
}

f) here it wont consider values that are present in Map 2 and also in Map 1

The logic seems to be working fine.Just wanted some suggestion on any other way I can handle the situation.

E.g. Map 1
<a,"Harry">
<b,"Potter">
<c,"Hermoine">

Map 2
<a,"Harry1">
<c,"Hermoine1">
<d,"Grenger">
<e,"Ron">

Output should have a Data structure(Class) containing 5 rows

a Harry Harry1
b Potter null
c HerMoine Hermoine1
d null Grenger
e null Ron


Do let me know if I have not made myself Clear.

Thanks in advance
Ankur

[Campbell Ritchie]

I don’t understand what you are trying to do. I have not seen a Map with an add() method? Do you mean java.util.Map, or a different sort of Map?

[Campbell Ritchie]

Go through the Java Tutorials, and find out about the bulk operations. That will allow you to implement S₁ ∪ S₂, S₁ ∩ S₂, S₁ ⊆ S₂, and S₁ \ S₂. etc. You can use S₁ and S₂, as the entry sets of the two maps, or the key or value sets.