Amazon Problem 2 for OptimalUtilization

AmazonSolution2.java

import java.util.*;
import java.util.stream.Collectors;

public class AmazonSolution2 {
    List<List<Integer>> optimalUtilization(int deviceCapacity,
                                            List<List<Integer>> foregroundAppList,
                                            List<List<Integer>> backgroundAppList) {
        List<List<ComplexCapacity>> foundCapacities = new ArrayList<>();
        foregroundAppList.forEach(forApp -> foundCapacities.add(getMemUsage(forApp, backgroundAppList)));
        List<List<Integer>> exactCapacity = new ArrayList<>();
        List<List<Integer>> closeCapacity = new ArrayList<>();
        //get values and select the ones inferior to deviceCapacity
        foundCapacities.forEach(set -> exactCapacity.addAll(set.parallelStream().filter(e -> e.getMemoryUsage() == deviceCapacity)
                .map(ComplexCapacity::getCoordinate).collect(Collectors.toList())));
        if(exactCapacity.isEmpty()){
            foundCapacities.forEach(set -> closeCapacity.addAll(set.parallelStream().filter(e -> (e.getMemoryUsage() <= deviceCapacity)
                    && e.getMemoryUsage() >= ((deviceCapacity+e.getMemoryUsage())/2))
                    .map(ComplexCapacity::getCoordinate).collect(Collectors.toList())));
            return closeCapacity;
        } else {
            return exactCapacity;
        }
    }

    List<ComplexCapacity> getMemUsage(List<Integer> forApp, List<List<Integer>> backgroundAppList) {
       return backgroundAppList.parallelStream().map(backApp ->
                new ComplexCapacity(forApp.get(1)+backApp.get(1),
                        Arrays.asList(forApp.get(0),backApp.get(0)))).
                        collect(Collectors.toList());
    }
}

class ComplexCapacity {
    private int memoryUsage;
    private List<Integer> coordinate;

    public ComplexCapacity(int memoryUsage, List<Integer> coordinate) {
        this.memoryUsage = memoryUsage;
        this.coordinate = coordinate;
    }

    public int getMemoryUsage() {
        return memoryUsage;
    }

    public void setMemoryUsage(int memoryUsage) {
        this.memoryUsage = memoryUsage;
    }

    public List<Integer> getCoordinate() {
        return coordinate;
    }

    public void setCoordinate(List<Integer> coordinate) {
        this.coordinate = coordinate;
    }
}