api/src/main/java/net/wesjd/anvilgui/AnvilGUI.java
public Builder item(ItemStack item) {
			Validate.notNull(item, "item cannot be null");
			this.item = item;
			return this;
		}
/**
		 * Sets the {@link ItemStack} to be put in the first slot
		 * @param item The {@link ItemStack} to be put in the first slot
		 * @return The {@link Builder} instance
		 * @throws IllegalArgumentException if the {@link ItemStack} is null
		 */
Sets the  ItemStack to be put in the first slot
@param item The  ItemStack to be put in the first slot
@return The  Builder instance
@throws IllegalArgumentException if the  ItemStack is null
Sets the ItemStack to be put in the first slot @param item The ItemStack to be put in the first slot @return The Builder instance @throws IllegalArgumentException if the ItemStack is null
public Builder item(ItemStack item) {
			Validate.notNull(item, "item cannot be null");
			this.item = item;
			return this;
		}
public Builder item ( ItemStack item ) { Validate . notNull ( item , "item cannot be null" ) ; this . item = item ; return this ; }
Sets the {@link ItemStack} to be put in the first slot
 @param item The {@link ItemStack} to be put in the first slot
 @return The {@link Builder} instance
 @throws IllegalArgumentException if the {@link ItemStack} is null
Sets the { @link ItemStack } to be put in the first slot @param item The { @link ItemStack } to be put in the first slot @return The { @link Builder } instance @throws IllegalArgumentException if the { @link ItemStack } is null