Java 8 : At A Go

	package com.tvidushi;
	import static java.util.stream.Collectors.groupingBy;
	import static java.util.stream.Collectors.mapping;
	import static java.util.stream.Collectors.toList;
	import java.util.Arrays;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.function.Predicate;
	import java.util.function.Supplier;
	import java.util.stream.Collectors;
	import com.tvidushi._ListExample.EatingPreference;
	/*
	* @author takshila Vidushi
	*/
	public class _ListExample {
	/*
	* Problem :
	* You are given list of Passengers create List based on destinations
	* */
	public enum EatingPreference {V,NV};
	public static List<Passenger> PassengerList ;
	static{
	PassengerList = Arrays.asList(
	new Passenger("G1110349",true,"Hong Kong","Economy","Zu","Ciana","SFO","HKG",3,72.0,false,EatingPreference.NV,"A-12",2),
	new Passenger("P212220",true,"China","Economy","Di","Cia","SFO","HKG",1,15,false,EatingPreference.NV,"B-17",10),
	new Passenger("Q378909",true,"India","Business","Gupta", "Rakesh", "SFO","DEL",2,52,false,EatingPreference.NV,"B-11",7),
	new Passenger("U190909",true,"India","Business","Sharma", "Aditi", "SFO","HKG",3,75,false,EatingPreference.V,"C-12",1),
	new Passenger("H189189",true,"India","Economy","Sharma", "Sohan", "SFO","DEL",2,14,false,EatingPreference.V,"D-03",1),
	new Passenger("R178909",true,"India","First Class","Chattergee","Priyanshu", "SFO","DEL",2,15,false,EatingPreference.V,"G-9",1));
	}
	public static void healthCheck() {
	Predicate<Passenger> healthCheck = p->p.isHealthIssue() ==true;
	System.out.println(PassengerList.stream().anyMatch(healthCheck));
	}
	public static void listByClass() {
	}
	public static void eligibleForUpgrade() {
	}
	public static void listByNationality() {
	/* System.out.println(
	PassengerList.stream()
	.collect(groupingBy(Passenger::getNationality))); */
	System.out.println(
	PassengerList.stream()
	.collect(groupingBy(Passenger::getNationality,
	mapping(Passenger::getFirstname, toList()))));
	}
	public static void listByEatingPreferences() {
	System.out.println(
	PassengerList.stream()
	.collect(groupingBy(Passenger::getPref,
	mapping(Passenger::getFirstname, toList()))));
	}
	public static void removeHeathIssues(){
	Predicate<Passenger> removeHealthIssue = p->p.isHealthIssue()==true;
	PassengerList.removeIf(removeHealthIssue);
	PassengerList.forEach(x-> System.out.print(" "+x.getFirstname()));
	}
	public static void listSeatNoByMeals(){
	Predicate<Passenger> seatListByMeals = (p-> p.getPref() ==EatingPreference.V) ;
	Map<Boolean, List<Passenger>>seatList =PassengerList.stream().collect(Collectors.partitioningBy(seatListByMeals));
	seatList.forEach((k,v)->System.out.println("Veg Meals :"+k+" "+
	((List<Passenger>)v).stream().map(s->s.getFirstname()).collect(Collectors.joining(","))));
	}
	public static void destionationList(String destination) {
	Predicate<Passenger> des_hkg = p->p.getDestination() ==destination;
	List<String> destination_hkg = PassengerList.stream()
	.filter(des_hkg)
	.map(Passenger::getFirstname)
	.collect(Collectors.toList());
	destination_hkg.stream().forEach(x->System.out.println(x));
	}
	public static void groupByNationality(String nationality) {
	Predicate<Passenger> des_hkg = p->p.getNationality() =="India";
	List<String> destination_hkg = PassengerList.stream()
	.filter(des_hkg)
	.map(Passenger::getFirstname)
	.collect(Collectors.toList());
	destination_hkg.stream().forEach(x->System.out.println(x));
	}
	public static void totalBaggageCount() {
	double baggageweight = PassengerList.stream().mapToInt(p->p.getBaggageCount()).count();
	System.out.println(" "+baggageweight);
	}
	public static void totalBaggageWeight() {
	double baggageweight = PassengerList.stream().mapToDouble(p->p.getBaggageWeight()).sum();
	System.out.println(" "+baggageweight);
	}
	public static void main(String[] args) {
	System.out.println("List of Passengers flying to HongKong");
	destionationList("HKG");
	System.out.println("List of Passengers flying to Delhi");
	destionationList("DEL");
	System.out.println("Number of bags aircraft is carrying");
	totalBaggageWeight();
	System.out.println("Total bags weight that aircraft is carrying ");
	totalBaggageWeight();
	System.out.println("Any passenger present with health issue ");
	healthCheck();
	System.out.println("List People By Nationalities");
	listByNationality();
	System.out.println("List People By Eating Preferences");
	listByEatingPreferences();
	System.out.println("List seat No By meals");
	listSeatNoByMeals();
	System.out.println("Remove passenger with health issue reported");
	removeHeathIssues();
	}
	}
	class Passenger {
	private String passportNo;
	private String lastname;
	private boolean status;
	public String getSeatNo() {
	return seatNo;
	}
	public void setSeatNo(String seatNo) {
	this.seatNo = seatNo;
	}
	private String _class;
	private String nationality;
	private String firstname;
	private String startingpoint;
	private String destination;
	private int baggageCount;
	private double baggageWeight;
	private Boolean healthIssue;
	private EatingPreference pref;
	private String seatNo;
	private int frequentFlyer;
	public Passenger(String passportNo,boolean status,String nationality,String lastname,String _class, String firstname,String startingpoint,String destination,int baggageCount,double baggageWeight,boolean healthIssue,EatingPreference pref,String seatNo,int frequentFlyer) {
	this.passportNo = this.passportNo;
	this.status = status;
	this.nationality = nationality;
	this._class = _class;
	this.lastname = lastname;
	this.firstname = firstname;
	this.startingpoint = startingpoint;
	this.destination = destination;
	this.baggageCount = baggageCount;
	this.baggageWeight = baggageWeight;
	this.healthIssue = healthIssue;
	this.pref=pref;
	this.seatNo=seatNo;
	this.frequentFlyer = frequentFlyer;
	}
	public int getFrequentFlyer() {
	return frequentFlyer;
	}
	public void setFrequentFlyer(int frequentFlyer) {
	this.frequentFlyer = frequentFlyer;
	}
	public EatingPreference getPref() {
	return pref;
	}
	public void setPref(EatingPreference pref) {
	this.pref = pref;
	}
	public Boolean getHealthIssue() {
	return healthIssue;
	}
	public String getNationality() {
	return nationality;
	}
	public void setNationality(String nationality) {
	this.nationality = nationality;
	}
	public Boolean isHealthIssue() {
	return healthIssue;
	}
	public void setHealthIssue(Boolean healthIssue) {
	this.healthIssue = healthIssue;
	}
	public String getPassportNo() {
	return passportNo;
	}
	public double getBaggageWeight() {
	return baggageWeight;
	}
	public void setBaggageWeight(double baggageWeight) {
	this.baggageWeight = baggageWeight;
	}
	public int getBaggageCount() {
	return baggageCount;
	}
	public void setBaggageCount(int baggageCount) {
	this.baggageCount = baggageCount;
	}
	public void setPassportNo(String passportNo) {
	this.passportNo = passportNo;
	}
	public String getLastname() {
	return lastname;
	}
	public void setLastname(String lastname) {
	this.lastname = lastname;
	}
	public String getFirstname() {
	return firstname;
	}
	public void setFirstname(String firstname) {
	this.firstname = firstname;
	}
	public String getStartingpoint() {
	return startingpoint;
	}
	public void setStartingpoint(String startingpoint) {
	this.startingpoint = startingpoint;
	}
	public String getDestination() {
	return destination;
	}
	public void setDestination(String destination) {
	this.destination = destination;
	}
	public boolean isStatus() {
	return status;
	}
	public void setStatus(boolean status) {
	this.status = status;
	}
	public String get_class() {
	return _class;
	}
	public void set_class(String _class) {
	this._class = _class;
	}
	}

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