Filtering out objects from ArrayList<Object> based on object field?

Question

I am looking for a simple method instead of while/for loop, for filtering out set of objects from ArrayList<Object> base on the object that contains a unique value.

For example ,i have list of object as

[Status [status=new], Status [status=closed], Status [status=new], Status [status=closed], Status [status=new], Status [status=closed], Status [status=new], Status [status=closed], Status [status=new], Status [status=closed]].

I need the objects that has status value"new" into a list to compare.No need of the object that has already closed.

Post some code of what you have done. And explain yourself better, please. — Leonardo
– Leonardo, Commented Dec 21, 2015 at 13:08

appersiano · Accepted Answer · 2015-12-21 13:29:40Z

4

The unique way to write less and readable code for filtering a collection is use java 8 lambda expressions.

Unfortunately java8 is not still supported by Android but....you can use retrolambda. And if you need to use the Stream API you can try this plugin Lightweight-Stream-API. (the Stram API is not supported by retrolambda)

In that case:

List<Person> newList = Stream.of(personList).filter(p -> p.getAge() > 18).collect(Collectors.toList());

answered Dec 21, 2015 at 13:29

appersiano

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2 Comments

SachinS Over a year ago

where did p comes from inside filter(p ->..)?

eriuzo Over a year ago

in the statement filter(p -> p.getAge() > 18) p actually declares itself

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