Ankit :
I was trying to filter Entries in HashMap using Streams API, but stuck in last method call Collectors.toMap. So, I don't have clue to implemement toMap method
public void filterStudents(Map<Integer, Student> studentsMap){
HashMap<Integer, Student> filteredStudentsMap = studentsMap.entrySet().stream().
filter(s -> s.getValue().getAddress().equalsIgnoreCase("delhi")).
collect(Collectors.toMap(k , v));
}
public class Student {
private int id;
private String firstName;
private String lastName;
private String address;
...
}
Any Suggestions?
Eran :
Just generate the output Map out of the key and value of the entries that pass your filter:
public void filterStudents(Map<Integer, Student> studentsMap){
Map<Integer, Student> filteredStudentsMap =
studentsMap.entrySet()
.stream()
.filter(s -> s.getValue().getAddress().equalsIgnoreCase("delhi"))
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
}
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