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stg
stg

Reputation: 2797

Best way to search for specific attribute of Object

I have a List of Objects, e.g.

public class Foo {
   private String str;
   private Integer i;
   // Getter
}

//

List<Foo> list;

Now I want to search for e.g. all Object where String str is equal to someString What would be the best way to archieve that? Of course I could iterate over the whole List und compare every Object with my search-String (or search-Integer, or whatever I am lookin for), but I am wondering if there is a ready solution for this (in my opinion where basic task) e.g. in the Collection-Framework or somewhere else?

Upvotes: 0

Views: 86

Answers (2)

kmera
kmera

Reputation: 1745

If you want to use guava you could do something like this:

Foo result = Iterables.find(list, new Predicate<Foo>() {
    public boolean apply(Foo foo) { return foo.getInteger() == 3; }
});

Or in the upcoming java8 you can use lambda expressions:

list.stream()
    .filter( f -> f.getInteger() == 3)
    .collect(Collectors.toList());

And you won't need a 3rd party library for that :)

Upvotes: 1

gipsh
gipsh

Reputation: 598

Take a look at google's Guava and filters api:

https://code.google.com/p/guava-libraries/wiki/FunctionalExplained

Upvotes: 2

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