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Book.java

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class Book {

private String id;

private String title;

private String author;

private boolean isAvailable;

public Book(String id, String title, String author) {

if (id.length() != 5) {

throw new IllegalArgumentException("It should 5 character!!!");

}

this.id = id;

this.title = title;

this.author = author;

this.isAvailable = true;

}

public String getId() {

return id;

}

public String getTitle() {

return title;

}

public String getAuthor() {

return author;

}

public boolean isAvailable() {

return isAvailable;

}

public void borrow() {

if (isAvailable) {

isAvailable = false;

} else {

throw new IllegalStateException("Book is not available.");

}

}

public void returnBook() {

isAvailable = true;

}

public void printBookInfo() {

System.out.println("ID: " + id + ", Title: " + title + ", Author: " + author + ", Available: " + isAvailable);

}

}