how to replace for loop by forEach

Question

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?

I’m voting to close this question because this is clearly a homework assignment and you should show us what you have attempted first. — David Brossard
– David Brossard, Commented Oct 23, 2020 at 5:29
Yeah, looks like a homework problem. I suppose the first question for original poster is: "Tell me in once sentence what this code is doing." — Frank Yellin
– Frank Yellin, Commented Oct 23, 2020 at 5:33
@David Brossard : I know how to replace for loop with foreach, but my current functionality is having break statement too. I wanted to know how can we use break with foreach ? — JavaFan
– JavaFan, Commented Oct 23, 2020 at 5:36

pradeexsu · Accepted Answer · 2020-10-23 05:32:16Z

this way you can apply for-each loop.

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

Dumbo · Accepted Answer · 2020-10-23 06:24:17Z

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

Kelum Sampath Edirisinghe · Accepted Answer · 2020-10-23 06:32:36Z

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 });

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