Conditional statement in java8 forEach loop

Question

I have string which contain number of department separated by comma. I have to feed this data to sql 'IN' clause.

I want conditional check for last element, I do not want to append 'comma' after last element. I don`t know how to use condition inside java 8 forEach loop.

public String  getDeptInClauseParameters(String depts){
       StringBuilder deptsInParameter= new StringBuilder();
       Stream<String>  stream= Arrays.stream(depts.split(","));
       stream.forEach(dept ->  deptsInParameter.append("'").append(dept).append("' , "));
        return deptsInParameter.toString();
    }

You're looking for the part with a Stream, with `.collect(Collectors.joining(", "));`. — Tunaki, Dec 14 '16 at 11:46
And the usual advice: try to think beyond `forEach`, as otherwise, Streams will never be an improvement. — Holger, Dec 14 '16 at 12:29

score 2 · Answer 1 · answered Dec 14 '16 at 12:23

You can use the Collectors.joining(delimiter, prefix, suffix).

delimiter the delimiter to be used between each element
prefix the sequence of characters to be used at the beginning of the joined result
suffix the sequence of characters to be used at the end of the joined result

Example:-

    String depts = "Dept1,Dept2";
    Stream<String> stream = Arrays.stream(depts.split(","));

    System.out.println(stream.collect(Collectors.joining("','", "'", "'")));

This will print 'Dept1','Dept2'as output, hope it helps

Conditional statement in java8 forEach loop

1 Answers1