Java Streams return a specific class

Question

I have a list which contains many token requestors but ID is unique and filter will returns just one object.

for (TokenRequestor requestor : tokenRequestorList) {
    if (requestor.getId().equals(tokenRequestor.getId())) {
        System.out.println("This object is unique!");
    }
}

I try write this code in Java 8:

tokenRequestorList.stream().filter(tr -> tr.getId()
        .equals(tokenRequestor.getId())).collect(Collectors.toList());

How I can filter to return a TokenRequestor? This list will be contain 1 element.

E.g:

TokenRequestor myObject = tokenRequestorList.stream()
        .filter(tr -> tr.getId().equals(tokenRequestor.getId()))....;

Possible duplicate of Java 8 find first element by predicate — Didier L
– Didier L, Commented May 30, 2017 at 8:01

Roman Puchkovskiy · Accepted Answer · 2017-05-29 18:58:58Z

3

tokenRequestorList.stream()
    .filter(tr -> tr.getId().equals(tokenRequestor.getId()))
    .findAny()
    .orElse(null);

This will return any TokenRequestor instance matching the filter (in your case it will be unique), or null is nothing matches the filter.

answered May 29, 2017 at 18:58

Roman Puchkovskiy

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