import java.util.ArrayList;

import java.util.Collections;

import java.util.HashMap;

import java.util.List;

public class ArrayListVSMap {

public static void main(String[] args) {

// String만 가지고 있는 ArrayList

ArrayList<String> colors = new ArrayList<>();

HashMap<String, Integer> people = new HashMap<>();

// List 사용

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

myList.add("red");

myList.add("blue");

myList.add("green");

myList.add("yellow");

System.out.println(myList);

myList.add("black");

System.out.println(myList);

String third = myList.get(2);

System.out.println(third);

long count = myList.stream()

.filter(w -> w.length() > 3)

.count();

System.out.println(count);

long count2 = myList.parallelStream()

.filter(w -> w.length() > 3)

.count();

System.out.println(count2);

// long count3 = myList.stream()

// .map(w -> w.trim())

// .filter(w -> w.length() > 3)

// .count();

// System.out.println(count3);

// myList.clear();

// System.out.println(myList); // []

// Immutable list (unmodiriable List)

List<String> readOnlyList = Collections.unmodifiableList(myList);

System.out.println(readOnlyList);

// readOnlyList.add("white"); // error

// Java9 of 메소드 사용

// List<String> Java9List = List.of("red", "blue", "green");

String str1 = "Hello! Java World";

int index = str1.indexOf("Java");

int size = "Java".length() ;

String str2 = str1.substring(index, index+size);

str2 = str2.toLowerCase();

str2 = str2.replace('a', 'A');

System.out.println(str2);

}

}