streams.java

import java.time.Duration;
import java.time.Instant;
import java.util.*;
import java.util.stream.Collectors;

public class StreamsProgram {

    public static void main(String args[]) {

        List<String> someCrazyLowerCaseWords = Arrays.asList("gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre","gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "gregrerege","rgregergregregrgteg","jiuiyikuyiuykuyk","dwqdwqdddqwwdw","bcvdvbdvhfbvfhv","fhgywefgwehbcj","fghruwebvvdjsnvdfjsv","wpoeopwquroiweqre",
                "fefbewfuyewgfeyurfge","gnerkjghregiure","rgregregreggre","rgregerggregreg","rgregredhvyrgery","vkugrevgrevgrruvberuvrev","efhergfhrgfrehgre",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd",
                "rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd","rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd","rgrgregregregregrvrevrevrvreveravrvrevrevrvrevrvrev","vrevervrvrevrvrvrevrvrdvrgvrvreververvrevrevrvrvrrv","vrevrevrevrevrevrvrrvrvrevrevrrevr",
                "vervr","vervr","rev","rvrevewvce","iiou","ewqeqwe","opipo","sdad","fdgfd","jhfjjghg","wewqds","vcxcxvcxv","uiuyiuy","weeqwqe","mnbbnbnn","dwqdwwd");


        Instant start = Instant.now();
        List<String> upperCase = new ArrayList<>();
        for(String lowerCaseWord : someCrazyLowerCaseWords) {
            upperCase.add(lowerCaseWord.toUpperCase());
        }
        Instant end = Instant.now();
        Duration timeTaken = Duration.between(start,end);
        System.out.println("Time taken for 'for' loop: " + timeTaken.getNano());

        start = Instant.now();
        List<String> upperCase1 = someCrazyLowerCaseWords.stream().map(String::toUpperCase).collect(Collectors.toList());
        end = Instant.now();
        timeTaken = Duration.between(start,end);
        System.out.println("Time taken for 'map': " + timeTaken.getNano());

        start = Instant.now();
        List<String> upperCase2 = new ArrayList<>();
        someCrazyLowerCaseWords.forEach(s->upperCase2.add(s.toUpperCase()));
        end = Instant.now();
        timeTaken = Duration.between(start,end);
        System.out.println("Time taken for 'foreach loop': " + timeTaken.getNano());
    }
}