Example

import java.lang.String;
import java.util.ArrayList;
import java.util.List;
import org.bukkit.Material;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.BookMeta;

public final class Libro {
  public static ItemStack getItemStack() {
    ItemStack item = new ItemStack(Material.WRITTEN_BOOK);
    BookMeta meta = (BookMeta) item.getItemMeta();
    meta.setAuthor("KHobbits");
    meta.setTitle("§4Book §9o §6Colors");
    List<String> pages = new ArrayList<>();
    pages.add("Minecraft colors:§0\n"
            + "§0 &0  §1 &1  §2 &2  §3 &3§0\n"
            + "§4 &4  §5 &5  §6 &6  §7 &7§0\n"
            + "§8 &8  §9 &9  §a &a  §b &b§0\n"
            + "§c &c  §d &d  §e &e  §f &f§0\n"
            + "§0 §0\n"
            + "§0&k §0§kMagic§0   &l §0§lBold§0\n"
            + "§0§l&m §0§l§mStrike§0  &n §0§nUline§0\n"
            + "§0§n&o §0§o§nItalic§0   &r §0Reset§0\n");
    meta.setPages(pages);
    meta.setDisplayName("§cColores");
    List<String> lore = new ArrayList<>();
    lore.add("Ingame color codes");
    meta.setLore(lore);
    item.setItemMeta(meta);
    return item;
  }
}