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package com.javatechie.stream;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.function.BiFunction;

import java.util.function.Function;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class BiFunctionExample implements BiFunction<List<Integer>, List<Integer>, List<Integer>> {

@Override

public List<Integer> apply(List<Integer> list1, List<Integer> list2) {

return Stream.of(list1, list2)

.flatMap(List::stream)

.distinct()

.collect(Collectors.toList());

}

public static void main(String[] args) {

BiFunction biFunction = new BiFunctionExample();

List<Integer> list1 = Stream.of(1, 3, 4, 6, 7, 9, 19).collect(Collectors.toList());

List<Integer> list2 = Stream.of(11, 3, 43, 6, 7, 19).collect(Collectors.toList());

System.out.println("Traditional approach : " + biFunction.apply(list1, list2));

BiFunction<List<Integer>,List<Integer>,List<Integer>> biFunction1=new BiFunction<List<Integer>, List<Integer>, List<Integer>>() {

@Override

public List<Integer> apply(List<Integer> l1, List<Integer> l2) {

return Stream.of(l1, l2)

.flatMap(List::stream)

.distinct()

.collect(Collectors.toList());

}

};

System.out.println("annonymous impl : "+biFunction1.apply(list1, list2));

BiFunction<List<Integer>,List<Integer>,List<Integer>> biFunction2=( l1, l2) ->{

return Stream.of(l1, l2)

.flatMap(List::stream)

.distinct()

.collect(Collectors.toList());

};

Function<List<Integer>,List<Integer>> sortedFunction=(lists)->lists

.stream()

.sorted()

.collect(Collectors.toList());

System.out.println("Lambda approach : "+biFunction2.andThen(sortedFunction).apply(list1, list2));

Map<String, Integer> map=new HashMap<>();

map.put("basant",5000);

map.put("santosh",15000);

map.put("javed",12000);

BiFunction<String,Integer,Integer> increaseSalaryBiFunction= new BiFunction<String, Integer, Integer>() {

@Override

public Integer apply(String key, Integer value) {

return value+1000;

}

};

//map.replaceAll(increaseSalaryBiFunction);

//BiFunction<String,Integer,Integer> increaseSalBiFunction= ( key, value) -> value+2000;

map.replaceAll(( key, value) -> value+2500);

System.out.println(map);

}

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