I have an Integer array as
Integer[] myArray= {1,3};
I have another List of objects MyDept which has the properties id and name.
I want to get those objects of MyDept whose ids matches with the values of myArray.
If the objects in the list are
Objfirst(1,"Training"), Objsecond(2,"Legal"), Objthird(3,"Media")
then I want Objfirst and Objthird.
You can do it in two steps as :
List<MyDept> myDepts = new ArrayList<>(); // initialised arraylist of your objects
// collect the objects into a Map based on their 'id's
Map<Integer, MyDept> myDeptMap = myDepts.stream().collect(Collectors.toMap(MyDept::getId, Function.identity()));
// iterate over the input array of 'id's and fetch the corresponding object to store in list
List<MyDept> myDeptList = Arrays.stream(myArray)
.map(myDeptMap::get)
.collect(Collectors.toList());
with a minimal object as :
class MyDept{
int id;
String name;
// getters and setters
}
