How to convert String to string set in java

Question

I have a method with return type as string below is the string which is getting retrieved how should in convert this string to setso that i can iterate through the String set.

["date:@value2","lineofbusiness:@value3","pnrno:@value1","reason:@value4"]

If i try to split using String[] the result is not expected i have to get these individual values like date:@value2 and have to split this to complete the rest of my logic.

How to convert the above string to below string set

Set<String> columnmapping = new HashSet<String>();

"I have a method with return type as string below" - This is not a String, it's a String[] (or Collection<String>). To convert a String[] in a Set<String>, we can use Set.of(...). — Turing85
– Turing85, Commented Sep 20, 2020 at 8:31
Does this answer your question? Java: How to convert String[] to List or Set — Svirin
– Svirin, Commented Sep 20, 2020 at 8:57
It is a string set coming from AWS DynamoDB i am retrieving whole string set as a string only — sanjay m
– sanjay m, Commented Sep 20, 2020 at 9:30

Niyas · Accepted Answer · 2020-09-20 10:57:50Z

3

I use Apache Commons for string manipulation. Following code helps.

String substringBetween = StringUtils.substringBetween(str, "[", "]").replaceAll("\"", ""); // get rid of bracket and quotes
String[] csv = StringUtils.split(substringBetween,","); // split by comma
Set<String> columnmapping  = new HashSet<String>(Arrays.asList(csv));

answered Sep 20, 2020 at 10:57

Niyas

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pirho · Accepted Answer · 2020-09-20 15:23:17Z

1

In addition to the accepted answer there are many options to make it in "a single line" with standards Java Streams (assuming Java >= 8) and without any external dependencies, for example:

String s =
"[\"date:@value2\",\"lineofbusiness:@value3\",\"pnrno:@value1\",\"reason:@value4\"]";
Set<String> strings = Arrays.asList(s.split(",")).stream()
                            .map(s -> s.replaceAll("[\\[\\]]", ""))
                            .collect(Collectors.toSet());

edited Sep 20, 2020 at 15:23

answered Sep 20, 2020 at 13:51

pirho

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