algorithm - Compare the two ArrayLists in java which contains same objects -

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I have the following two array lists: AccVO: Comparison, Zodiac Field

List 1: 

  AccVO [001,500] ACCVO [002,600] ACCVO [003,800]

List 2:

I have solved two lists, I have to compare two lists with the key and databay Insert in to get the record list 2.

Sample code: 

 for  (AccVO accvo1: List1) {for (AccVO accvo2: List2) {if (accvo1.getCmpkey (). Equals (accvo2. GetCmpkey ())} // Enter recs in the table}}}

My list size will be bigger, that means, to handle millions of records, I want some optimistic arguments to bridge the records. / P>

Thank you in advance

Because your lists are resolved, you You can use an index in both oranes and prefix At only a small key increases in time: 

  int i = 0, j = 0; while (i

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