Deque

thank you so much i'll try two ways but i still have to do it Deque

I'm also a bit scared of the pace of the course but I have to make it, the stakes are high for me

Yes, the course here can be very demanding at times. And some of the tasks are not doable with just the knowledge you got solely at Codegym. You should read additional books, too. That helps a lot.

I mean, I'm taking another course plus codegym plus normal job so I get up 5-6am and go to bed around 11-12pm I buy a lot of books and sometimes normal talk are better for understanding because there always a lot variables they cheated because the course I'm taking is not only for 20 hours a week like they said I still need a lot of tips but from rookie in a month I think I've made a lot of progress anyway I often come across walls, but I don't have much time to stick to them for example now You gave me a generator for letters from a to z and thank you very for this much but for example I have a problem to modify it only for the letter a I have to generate a string of random length max (50) only one letter, not letters from a to z like aaaaaaaaaaa aaa aaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaa a aaaaaaaaaaa aa aaaaaaa etc...

If you need just the letter a, then you do not need a generator. It's just char c = 'a'; (or you write code that has 97 as result and from that you initialize the char). to repeat it x times you use a loop

String result = "";
int count = 50;
char c = 'a';
for (int i = 0; i < count; i++) {
    result += c;
}

Here you can modify the count variable to use random values (1 - 50) int count = (char) (Math.random * 50 + 1); you also could use the Random class if you like that one more. The usage is the same random.nextInt(50) + 1; (nextInt creates random values from 0 (incl) to 50 (excl) -> from 0 to 49, so you just add 1, like with Math.random()). If you want to create 50 random strings, then you use an outer loop that runs 50 times. Count changes so this variable needs to be moved inside the outer loop. Similar result, it needs to be reset after the inner loop ran and you saved the result.

char c = 'a';

for (int j = 0; j < 50; j++) {
    String result = "";
    int count = (char) (Math.random() * 50 + 1);

    for (int i = 0; i < count; i++) {
        result += c;
    }

    String evenOrOdd = result.length() % 2 == 0 ? "even" : "odd ";
    System.out.format("%s: %2d    -    %s%n", evenOrOdd,result.length(), result);
}

And yes. This is not easy. It's a lot of things that you learn at the same time and it is confusing. I needed several attempts at several stages and I also gave up several times 🤣. But I also have seen that some paradigmas that weren't understandable at all at the beginning for me became common at some point. I didn't even think about it anymore. But you always will see/ learn new things when coding. The feeling that you make stupid mistakes will never go away.

and so for a whole life 😄

I'm getting old, but yeah it's fun 😃😃

I don't know how to add it to pass the results to the array

You better use a list instead of an array.

List<String> even = new ArrayList<>();
List<String> odd = new ArrayList<>();

char c = 'a';

for (int j = 0; j < 50; j++) {
    String result = "";
    int count = (char) (Math.random() * 50 + 1);

    for (int i = 0; i < count; i++) {
        result += c;
    }

    if (result.length() % 2 == 0) {
        even.add(result);
    } else {
        odd.add(result);
    }
}

I changed the example to my version of the assignment I was instructed to do it this way 1. In main, you create a queue with generated Strings word merging should be done in main i mean generate random 'a' 2. You pass it to executeTasks, they are split into the appropriate lists but as mentioned i have a problem with referencing things in code it is still confusing for me☹️ ☹️☹️☹️

This way?

public void executeTasks(Deque<String> theQueue) {

    String task;
    while ((task = theQueue.poll()) != null) {
        System.out.println(task);

        // or just keep the if - else
        boolean isAdded = task.length() % 2 == 0 ? even.add(task) : odd.add(task);
        executedTasks.add(task);

        System.out.println("\nExecuted total " + executedTasks.size() + " tasks\n");
    }
}

public static void main(String[] args) throws java.lang.Exception {

    final int NUM_TASKS = 50;
    String chr = "a";
    Deque<String> taskQueue1 = new ArrayDeque<>();

    for (int i = 0; i < NUM_TASKS; i++) {
        // repeat... from SE11 on? or use StringBuilder instead of concatenation
        taskQueue1.offer(chr.repeat((int) (Math.random() * 50 + 1)));
    }

    TaskManager taskExecutor = new TaskManager();
    taskExecutor.executeTasks(taskQueue1);

    System.out.println("Parzyste:");
    System.out.println(taskExecutor.even);
    System.out.println("Nieparzyste:");
    System.out.println(taskExecutor.odd);
}

// using StringBuilder instead of String.repeat
StringBuilder sb = new StringBuilder();
for (int i = 0; i < NUM_TASKS; i++) {
    int count = (char) (Math.random() * 50 + 1);

    for (int j = 0; j < count; j++) {
        sb.append(c);
    }
    taskQueue1.offer(sb.toString());
    sb.setLength(0);
}

😲 wow yes like this

Ok You haven't added me to your friends, so i have reached message limit for today 🤣 next question I need make Book ( class) with title and author I wanted to change your generator so that many letters popped out like jhggusyafuc etc.. but it doesn't fit i would like to generate random letters for titles and authors and insert them into linkedlist random name generation fits because the list is going to be long hery long

I have explained how to create random characters above, eg.

char randomChar = (char) (Math.random() * 26 + 97);

this creates a random lowercase char. Now instead of appending the same char random times to a string, you create a random amount of random chars. Packed into your main:

final int NUM_TASKS = 50;
Deque<String> taskQueue1 = new ArrayDeque<>();

for (int i = 0; i < NUM_TASKS; i++) {
    String result = "";
    for (int j = 0; j < (int) (Math.random() * 50 + 1); j++) {
        result += (char) (Math.random() * 26 + 97);
    }
    taskQueue1.offer(result);
}

works ;) now you could replace concatenation with a StringBuilder (as before)

final int NUM_TASKS = 50;
Deque<String> taskQueue1 = new ArrayDeque<>();
StringBuilder sb = new StringBuilder();

for (int i = 0; i < NUM_TASKS; i++) {
    for (int j = 0; j < (int) (Math.random() * 50 + 1); j++) {
        sb.append((char) (Math.random() * 26 + 97));
    }
    taskQueue1.offer(sb.toString());
    sb.setLength(0);
}

later, when you're a pro coder you probably create a Supplier and use a stream to generate the strings...

public class RandomString implements Supplier<String> {
    /**
     * RandomString can be used as Supplier in a stream.
     * @return a random String of 1 - 50 lowercase letters
     */
    @Override
    public String get() {
        return ThreadLocalRandom.current().ints('a', 'z' + 1)
                .mapToObj(e -> String.valueOf((char) e))
                .limit(ThreadLocalRandom.current().nextInt(1, 51))
                .collect(Collectors.joining(""));
    }
}

class TestCase {
    public static void main(String[] args) {
        // generate 30 random Strings and output them
        System.out.println("using the supplier to generate a stream of random strings");
        Stream.generate(new RandomString())
                .limit(5)
                .forEach(System.out::println);

        // or you create an instance and invoke get() to get a random String
        System.out.println("\n\nusing get() 'manually' (outside a stream)");
        RandomString randString = new RandomString();
        for (int i = 0; i < 5; i++) {
            System.out.println(randString.get());
        }
    }
}

I'll study it when I get home thanks a lot 😊

and now I have a problem how to pass the random result to produce a new book (object) with these random generated string in linked list

If you want a random string, then you just modify the above loop. You do not need NUM_TASKS strings but you start with one and you do not add it to a queue. So it should look like (using StringBuilder)...

StringBuilder sb = new StringBuilder();
for (int j = 0; j < (int) (Math.random() * 50 + 1); j++) {
    sb.append((char) (Math.random() * 26 + 97));
}

String randomString = sb.toString();
System.out.println(randomString);

Book book = new Book(randomString, randomString);

cause you need two random strings you can think about creating a method that does the job for you and instead of passing the string as argument to the constructor you call the just written method.

public class BookTest {

    public static void main(String[] args) {
        Book book = new Book(createRandomString(), createRandomString());
        System.out.println(book);
    }

    public static String createRandomString() {
        StringBuilder sb = new StringBuilder();
        for (int j = 0; j < (int) (Math.random() * 50 + 1); j++) {
            sb.append((char) (Math.random() * 26 + 97));
        }
        return sb.toString();
    }
}

class Book {
    private String author;
    private String title;

    public Book(String author, String title) {
        this.author = author;
        this.title = title;
    }

    @Override
    public String toString() {
        return "Book{" +
                "randomString='" + author + '\'' +
                ", randomString1='" + title + '\'' +
                '}';
    }
}

In therory I have written nothing new, just reused the above said ;)

yeah like this he put's the same title and author into every created book