Shows the proper concurrent use of a LinkedTransferQueue

ConcurrentPublicLibrary.java

public class Hello {
    
    public static void main(String[] args){
        Library library = new Library();
        
        new Thread(library).start();
        
        new Thread(new Renter(library,"Mike")).start();
        new Thread(new Renter(library,"Max")).start();
        new Thread(new Renter(library,"Priebe")).start();
        new Thread(new Renter(library,"Dom")).start();
    }
}

class Library implements Runnable{
    private TransferQueue<Book> shelves = new LinkedTransferQueue<>();
    
    public Library() {
        shelves.add(new Book("Capulets and Montagues, the unknown link"));
        shelves.add(new Book("War What is it Good For"));
        shelves.add(new Book("Virtuous Villians"));
        shelves.add(new Book("Love in the Water"));
    }
    
    public void run(){
        while(true){ }
    }
    
    public Book lend(){
        
        try {
            Book book = shelves.take();
            System.out.println("This ones good try "+book.getName()+". Enjoy!");
            return book;
        } catch(InterruptedException e){ }
        
        return new Book("Free Library Pamphlet on plagarism");
    }
    
    public void accept(Book book){
        shelves.offer(book);
       
    }
}

class Renter implements Runnable {
    private Library lib;
    private String name;
    public Renter(Library lib,String x){
        name = x;
        this.lib = lib;
    }
    public void run(){
        while(true){
            Book book = lib.lend();
            System.out.println(name+" chekced out "+book.getName());
            try{
                Thread.sleep(ThreadLocalRandom.current().nextInt(1000,5000));
            } catch(InterruptedException e) { }
            
            System.out.println(name+": Im done with "+book.getName()+" here take it back!");
            lib.accept(book);
        }
    }
}

class Book{
    private String name;
    public Book(String x ){
        name = x;
    }
    
    public String getName(){
        return name;
    }
    
}