Search for String in List

Question

public Account findByInterest(String interest){
    for(Map.Entry<Long, Account> e : accounts.entrySet()){
        for(int i = 0; i < e.getValue().getInterests().size(); i++)
        {
            if(e.getValue().getInterests().get(i) == interest){
                return e.getValue();
            }
        }

    }
    return null;
}

I'm trying to search in a HashTable of Objects to find an objected with a List of Strings, which has the same string as this method receives... What am I doing wrong?

4J41 · Answer 1 · 2013-12-25T20:30:17.390

6

To compare string values use the equals method.

Change

if(e.getValue().getInterests().get(i) == interest){

to

if(e.getValue().getInterests().get(i).equals(interest)){

edited Dec 25 '13 at 20:30

answered Dec 25 '13 at 20:20

4J41

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Thank you, but it doen't help. Still receive NullPointerException.. – mboronin Dec 25 '13 at 20:24
Then you should check for null before you call the methods. – 4J41 Dec 25 '13 at 20:25
2

Why is this the first time that `NullPointerException` is mentioned? 1) For better help sooner, post an [SSCCE](http://sscce.org/). 2) Always copy/paste error & exception output. – Andrew Thompson Dec 25 '13 at 20:26

Search for String in List

1 Answers1