how to convert nested for loop in stream API for the program [closed]

Question

List<Emp> list = Arrays.asList(
                   new Emp(123, "ABC"), new Emp(123, "BCD"), new Emp(1243, "AUBC"), 
                   new Emp(1233, "ABEC"), new Emp(1233, "ABLC")
                 );
List<Emp> listNew = new ArrayList<>();

for (int i = 0; i < list.size(); i++) {
    for (Emp emp : list) {
        if (list.get(i).getCommitId() == emp.getCommitId() && (!list.get(i).getHost().equals(emp.getHost()))) {
            Emp emp1 = new Emp();
            emp1.setCommitId(list.get(i).getCommitId());
            emp1.setHost(list.get(i).getHost());
            listNew.add(emp1);
        }
    }
}

I just need to compare two commitid if both are same and host will be different then return those data in the form of list of emp.

Answer 1

You can create a predicate to filter the Emp with the same commit id and a different host, filter the stream and collect to a new list

public static void main(String[] args) {
    List<Emp> list = Arrays.asList(new Emp(123, "ABC"), new Emp(123, "BCD"),
            new Emp(1243, "AUBC"), new Emp(1233, "ABEC"), new Emp(1233, "ABLC"));


    Predicate<Emp> sameCommitIdWithDifferentHost = (Emp emp) -> list.stream()
            .anyMatch(l -> l.getCommitId() == emp.getCommitId() &&
                    (!l.getHost().equals(emp.getHost())));

    List<Emp> listNew = list.stream().filter(sameCommitIdWithDifferentHost).collect(Collectors.toList());

 
}