Java collection for help-CodePudding

Now two sets List< again; ADto> A, List B, two collection objects have qty number inside, want to do with the number of associations, to form a new collection
Eg:
List A dto1: qty=4

List
Dto1: qty=4, name=desrc1
Dto2: qty=2, name=desrc2
Dto3: qty=2, name=desrc3

List
Dto1: qty=3, code=code1
Dto2: qty=1, name=code2
Dto3: qty=1, name=code3

List
Dto1 qty=3, name=descr1, code=code1
Dto2 qty=1, name=desrc2, code=code2
Dto3 qty=1, name=desrc3, code=code3

This is just A special case, more than A set just tease than B set, with A collection is given priority to, much less likely than B A than B, the number of rows may also be different, how

CodePudding user response:

O and set is?

 A.r etainAll (B);

CodePudding user response:

And it is as you say, o set?