package com.jin.algo;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class StreamEx {

public static void main(String[] args) {

List<String> programing =

Arrays.asList("Javascript", "C", "C++", "Nodejs", "Java", "Oracle", "MariaDB", "PHP", "ASP");

int count1 = 0;

for (String str : programing) {

if(str.indexOf("Java") > -1){

count1 += 1;

}

}

System.out.println("1-1.count1 = " + count1);

long count2 = programing.stream()

.filter(str->str.indexOf("java") > -1)

.count();

System.out.println("1-2.count2 = " + count2);

long count3 = programing.parallelStream()

.filter(str -> str.indexOf("Java") > -1)

.count();

System.out.println("1-3.count3 = " + count3);

// 2.Stream 생성

// 공백을 붙여서 하나의 스트링으로 만듬

String contents = programing.stream()

.collect(Collectors.joining(" "));

// 공백별로 잘라서 String[]배열을 반환

Stream<String> splitStr = Stream.of(contents.split(" "));

System.out.print("\n2.splitStr :");

splitStr.forEach(str -> System.out.print("[" + str + "]"));

System.out.print("\n3-2.map(toUpperCase) :");

programing.stream()

.map(String::toUpperCase)

.forEach(str -> System.out.print("[" + str + "]"));

System.out.print("\n3-3.flatMap() :");

programing.stream()

.filter(str->str.length()==3)

.flatMap(str->{

List<String> result = new ArrayList<>();

for(int i=0; i<str.length(); i++) {

result.add(str.substring(i, i+1));

}

return result.stream();

})

.forEach(str->System.out.println("["+str+"]"));

}

}