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Compare two ArrayList

Bindu Sanju

Joined: Feb 23, 2006
Posts: 16
HI ,
See the below code, I am comparing two arraylist values and getting the correct result while comparing equal. in bello example
I took the values ArrayList a1=a,b,c,d,e and ArrayList a2=a,b,c.
If I compare a1==a2 result : a,b,c is comming correctly. if I try to compare not equal position ,I want to get the data d,e. If any body know please modify the code and send me back.

Thank you advanced..

ArrayList a1=new ArrayList();
ArrayList a2=new ArrayList();

for(int i=0;i<a1.size();i++){
String str1 = (String) a1.get(i);
for(int j=0;j<a2.size();j++){
String str2 = (String) a2.get(j);
//int result = str1.compareTo(str2);
// if (result == 0)
//System.out.println(str1+ " = " + str2);
//else if (result > 0)
//System.out.println(str1+ " > " + str2);
if (str2.equalsIgnoreCase(str1))


Michael Labuschagne
Ranch Hand

Joined: May 08, 2007
Posts: 56

The code produces what you want and a little more, what it should do is take any two arraylists check which one has more elements in it. Go through both for the amount of elements in the smallest, comparing element for element between the arrays and displaying the ones which don't match.

Then goes through the remainder of the larger array and displays all since obviously there isn't a match because the smaller array has no elements for that range.

Next time, instead of asking for all the code perhaps you should ask for advice, better if you do it yourself, then you actually learn something.

Bindu Sanju

Joined: Feb 23, 2006
Posts: 16
Thanks Michael Labuschagne

Its working fine and thanks for your suggestion.

I agree. Here's the link: http://aspose.com/file-tools
subject: Compare two ArrayList
jQuery in Action, 3rd edition