arraylist

[vijayapriya thirumurugan]

hello sir,

i used object[][] el=new object[10][10]; to store arraylist in the form of matrix. and i got the output

[1, 3] null null null null
null [1, 2] null null null
null null [2] null null
null null null [] null
null null null null [1, 3]

my problem is :

[1,3] is in the position el[1][1] , [1,2] is in the position el[2][2]. where [1,3] is arraylist [1,2] , [2] ,[], [1,3] are also arraylist.
i want to get the common element between [1,3] and [1,2] i.e. the answer will be [1]. like this i want to get common elements which is of arraylist format.
can you help me. i'm waiting..

[Campbell Ritchie]

Don't understand the question, I am afraid.

[vijayapriya thirumurugan]

i got the about output.. i want to get common element between two arraylist

[Campbell Ritchie]

You can't return a "common element" because there might not be one common element. You can however search for a set of common elements.

I would convert the two Lists to Sets, then use the "bulk" methods of the Set interface. Look here and here.