SiAust

Scanner sc = new Scanner(System.in);
        List<Integer> numbers = Arrays.stream(sc.nextLine().split(" "))
                .mapToInt(Integer::parseInt).boxed().collect(Collectors.toList());
        int index = sc.nextInt();

        if (index < 0) {
            System.out.println(numbers.get(numbers.size() + index));
        } else {
            System.out.println(numbers.get(index));
        }

SiAust

import java.util.Scanner;

class Main {

    public static void main(String[] args) {
        HashTable<String> hashTable = new HashTable<>(5); // initial size

        Scanner sc = new Scanner(System.in);

SiAust

import java.util.Scanner;

class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        HashTable<String> table = new HashTable<>(Integer.parseInt(sc.nextLine()));

        while (sc.hasNext()) {

SiAust

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.util.Arrays;
import java.util.Scanner;

class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] input = Arrays.stream(sc.nextLine().split(" ")).mapToInt(Integer::parseInt).toArray();

SiAust

class HTTP {
    public static void main(String[] args) {
        HttpClient client = HttpClient.newBuilder().build();
        HttpRequest request = HttpRequest.newBuilder().GET().uri(URI.create("http://www.bbc.com")).build();
        try {
            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
            System.out.println(response.body());
        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }

SiAust

class Range implements Iterable<Long> {

    private final long fromInclusive;
    private final long toExclusive;

    public Range(long from, long to) {
        this.fromInclusive = from;
        this.toExclusive = to;
    }

SiAust

 /*
        * Compiles a regex pattern, calls a Matcher on with the input string as a param,
        * calls .results() which returns a stream of MatchResults for each successful match.
        * .count() counts the elements in the stream.
        * */
        String input = new Scanner(System.in).nextLine(); // "accggaabb"
        System.out.println((double) Pattern.compile("(?:[cg])").matcher(input).results().count() / input.length() * 100);
        // 44.44444444444444

SiAust

// Bumps the text by filling space to the left with whitespace
        System.out.printf("%20s%n", "hello:");
        System.out.printf("%20s%n", "hello my old friend:");
        System.out.printf("%20s%n", "hello, again:");
        System.out.printf("%20s%n", "hello, once more:");

SiAust

// Strategy design pattern with API requests, example.
class ApiRequestSender {

    ApiRequestMethod apiRequestMethod;

    public static void main(String[] args) {
        ApiRequestSender apiCategoriesRequest = new ApiRequestSender();
        apiCategoriesRequest.setApiRequestMethod(new CategoriesRequest());
        System.out.println(apiCategoriesRequest.sendRequest("www.spotify.com/endpoint/categories"));

SiAust

// To get a int[] from a single space separated string
int[] range = Stream.of(sc.nextLine().split(" ")).mapToInt(Integer::parseInt).toArray();

// Nice way to do a simple loop
while (n-- > 0) { // nice way to do a loop, postfix decrement
    // do something
}