ItemGiver.java

import com.sun.istack.internal.NotNull;
import org.bukkit.entity.Item;
import org.bukkit.entity.Player;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
import org.bukkit.inventory.meta.ItemMeta;

/**
 * ItemGiver is Giving Item to someone
 * @author Chromaryu
 */
public class ItemGiver {
    /**
     *
     * @param p Player
     * @param is ItemStack
     * @return boolean 
     * @throws IllegalArgumentException
     */
    public static boolean give(@NotNull Player p, @NotNull ItemStack is) {
        if(is == null | p == null) {
            throw new IllegalArgumentException("Failed to parse args");
        }
        PlayerInventory pi = p.getInventory();
        pi.addItem(is);
        return true;
    }
    /**
     *
     * @param p Player
     * @param i Item
     * @param n1 itemAmount
     * @return boolean
     * @throws IllegalArgumentException
     */
    public static boolean give(@NotNull Player p, @NotNull Item i,@NotNull int n1) {
        if(i == null | p == null) {
            throw new IllegalArgumentException("Failed to parse args");
        }
        ItemStack is = i.getItemStack();
        is.setAmount(n1);
        PlayerInventory pi = p.getInventory();
        pi.addItem(is);
        return true;
    }
    /**
     *
     * @param p Player
     * @param is ItemStack
     * @param im ItemMeta
     * @return boolean
     * @throws IllegalArgumentException
     */
    public static boolean give(@NotNull Player p,@NotNull ItemStack is,@NotNull ItemMeta im) {
        if(is == null | p == null | im == null) {
            throw new IllegalArgumentException("Failed to parse args");
        }
        is.setItemMeta(im);
        PlayerInventory pi = p.getInventory();
        pi.addItem(is);
        return true;
    }
}