Convert from for each to stream in java lambda

Question

I have the below expression

Map<String, String> institutionList = new LinkedHashMap<String, String>();
institutionService.list().forEach(institution -> institutionList.put(institution.getCode(),institution.getName()));

I tried like below.

institutionService.list().stream().collect(Collectors.toMap(‌Institution::getCode‌, Institution::getName));

But still error. how to convert this into stream() & map() with lambda?

try `institutionService.list().stream().collect(Collectors.toMap(Institution::getCode, Institution::getName));`. based on [this example](https://stackoverflow.com/questions/20363719/java-8-listv-into-mapk-v) — XtremeBaumer, Jul 14 '17 at 09:51
Hint: look up information on the characters \u200c and \u200b mentioned in the error message. — Klitos Kyriacou, Jul 14 '17 at 10:40
`\u200b and \u200b` is are "zero-width-space" non printing characters . You should remove — soorapadman, Jul 14 '17 at 10:46
See the red underline in your code below the "(I" at the word "Institution"? Delete those two (actually four) characters and re-type them in. You might also want to figure out where you copied them from, because non-printing characters are a nuisance. — phatfingers, Jul 14 '17 at 10:58

score 0 · Answer 1 · edited Dec 13 '17 at 22:10

0

An example which is working just fine:

Map<String, String> p = new HashMap<String, String>();
List<String> values = new ArrayList<String>(Arrays.asList("2", "4", "1"));
p = values.stream().collect(Collectors.toMap(String::toString, String::toString));
System.out.println(p);

results in

{1=1, 2=2, 4=4}

If we transfer it to your problem, the code might look like this:

I have the below expression

Map<String, String> institutionList = new LinkedHashMap<String, String>();
institutionList = institutionService.list().stream().collect(Collectors.toMap(‌Institution::getCode‌, Institution::getName));

In this case, I assume that your service gives values of class Institution

edited Dec 13 '17 at 22:10

chrki

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answered Jul 14 '17 at 09:57

XtremeBaumer

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It's throwing error at toMap(Institution::getCode,Institution::getName)); – Rajeshkumar Jul 14 '17 at 10:00
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and you assume i can read your brain and know what error you are talking of right? – XtremeBaumer Jul 14 '17 at 10:01
did you cops/paste the code? if yes type it by hand. also don't post pictures of code/error messages. this is all text and can be pasted just as that – XtremeBaumer Jul 14 '17 at 10:25

Convert from for each to stream in java lambda

1 Answers1