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javafor-loopforeach
JavaFan
JavaFan

Reputation: 23

how to replace for loop by forEach

My code is,

String Number = "123";
boolean NumberPresent = false;
List < Summary > smryList = smryListResponse.getSummaryList();

for (int i = 0; i < smryList.size(); i++) {
    if (Number.equals(smryList.get(i).getNumber())) {
        NumberPresent = true;
        break;
    }
}
if (NumberPresent) {
   //perform some actions
}

How can I replace this complete for loop functionality with forEach?

Upvotes: 2

Views: 459

Answers (3)

Kelum Sampath Edirisinghe
Kelum Sampath Edirisinghe

Reputation: 1267

you can replace the for loop with this loop.

 for (Summary summary : smryList) {
            if (Number.equals(summary.getNumber())) {
                NumberPresent = true;
                break;
            }
        }

otherwise, you can try

smryList.forEach(summary -> {//code here
        });

Upvotes: 0

Dumbo
Dumbo

Reputation: 1837

You don't need to use for or forEach if you want to detect is number presented. You can use streams with i.e. .anyMatch() method.
In example:

String number = "123";    
List<Summary> smryList = smryListResponse.getSummaryList();
boolean isNumberPresent = smryList
                           .stream()
                           .anyMatch(summary -> summary.getNumber().equals(number));
if (isNumberPresent) {
    // ...
}

Also, you can try do that with other stream methods, i.e. .filter() or other. But I prefer to use .anyMatch().

Remark: streams and lambda expressions works only with Java 8 or later. Otherwise use already posted solution

Upvotes: 2

pradeexsu
pradeexsu

Reputation: 1145

this way you can apply for-each loop.

for (Summary summary: smryList) {
    if (Number.equals(summary.getNumber())) {
        NumberPresent = true;
        break;
    }
    // ... 
}

Upvotes: 5

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