package com.company;

import java.util.stream.IntStream;

public class Main {
    public static void main(String[] args) {
        String s;
        //------------------------- simple = parallel (last two parameters are doing effectively the same)
        s = ints()
                .collect(StringBuilder::new, StringBuilder::append, StringBuilder::append).toString();
        System.out.println(s); //result: 12345

        s = ints()
                .parallel()
                .collect(StringBuilder::new, StringBuilder::append, StringBuilder::append).toString();
        System.out.println(s); //result: 12345

        //------------------------- same, but method ref-s replaced with lambdas (extracted to full)
        s = ints()
                .parallel() //doesn't matter here
                .collect(StringBuilder::new, (StringBuilder stringBuilder, int obj) -> stringBuilder.append(obj),
                        (StringBuilder stringBuilder, StringBuilder s1) -> stringBuilder.append(s1)).toString();
        System.out.println(s); //result: 12345


        //------------------------- more interesting (changing last two parameters)
        s = ints()
                .parallel()
                .collect(StringBuilder::new, (StringBuilder stringBuilder, int obj) -> stringBuilder.append(obj + "l☻l"), //works only once
                        (StringBuilder stringBuilder, StringBuilder s1) -> stringBuilder.append("-L☺L-")).toString(); //now matters (with parallelism)
        System.out.println(s); //result: 1l☻l-L☺L--L☺L-

        s = ints()
                .collect(StringBuilder::new, (StringBuilder stringBuilder, int obj) -> stringBuilder.append(obj),
                        (StringBuilder stringBuilder, StringBuilder s1) -> stringBuilder.append("-L☺L-")).toString(); //plays no role AT ALL !!!!!!! (fuck, why it's here then)
        System.out.println(s); //result: 12345
    }
    private static IntStream ints() {
        return IntStream.range(1, 6);
    }
}