h-hub

static void clientCode2() {
    Item user = findItem2("99").get();
}

static Optional<Item> findItem2(String id) {
    return Arrays.stream(users)
            .filter(item -> item.id.equals(id))
            .findFirst();
}

h-hub

Arrays.stream(new int[]{1,2,3,4}).anyMatch(num -> num == 3)

h-hub

static boolean isElementExistProper(int[] ints, int b){
        int i=0;
        while (true){
            if(ints.length==i) return false;
            if(ints[i++]==b) return true;
        }
    }

h-hub

//Please do not use this
static boolean isElementExistUgly(int[] ints, int b){
        try{
            int i=0;
            while (true){
                if(ints[i++]==b) return true;
            }
        } catch(ArrayIndexOutOfBoundsException ex){
            return false;
        }

h-hub

@Component
@Scope(value = "request", proxyMode = ScopedProxyMode.TARGET_CLASS)
public class MyRequestContext {

	private Jwt jwt;

	public MyRequestContext(){
		this.jwt = (Jwt) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
	}

h-hub

public class CallableExample {

    public static void main(String[] args) {

        ExecutorService executor = Executors.newFixedThreadPool(10);

        List<Future<String>> list = new ArrayList<>();

        Callable<String> callable = new HelloCallable();

h-hub

public class Main {

    public static void main(String[] args) {
        Thread thread1 = new Thread(new HelloRunnable());
        thread1.start();

        Thread thread2 = new Thread(new HelloThread());
        thread2.start();
    }

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import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class ItrExample {
    public static void main(String[] args) {

        List<String> list2 = List.of("item11","item22","item33"); //create a list

h-hub

public String uploadImage(MultipartFile image, String bucketName) {

	File imageFile;

	try {
		imageFile = convertMultiPartToFile(image);
	} catch (IOException e) {
		throw new FileUploadException("Unable to convert input stream to file.");
	}

h-hub

@PreAuthorize("hasRole('ROLE_USER')")
@RequestMapping(value = "/image/upload", method = RequestMethod.POST, produces = { "application/json",
		"application/xml" })
@ResponseBody
@ResponseStatus(code = HttpStatus.CREATED)
public ImageDto uploadImage(@RequestParam(value = "imageFile", required = true) @ValidateImg MultipartFile image) {

	String bucketName = "public-bucket-for-files";

	String imageUrl = imageService.uploadImage(image, bucketName);