import java.util.ArrayList;

import java.util.List;

class Guitar $\{$

String color;

String brand;

String model;

double price;

boolean isSecondHand;

String warehouse;

int stockNumber;

public Guitar$($String color, String brand, String model, double price, boolean isSecondHand, String warehouse, int stockNumber$)\{$

this.color $=$ color;

this.brand $=$ brand;

this.model $=$ model;

this.price $=$ price;

this.isSecondHand $=$ isSecondHand;

this.warehouse $=$ warehouse;

this.stockNumber $=$ stockNumber;

$\}$

$\}$

class Inventory $\{$

List guitars $=$ new ArrayList$<>()$;

public void addGuitar$($Guitar guitar$)\{$

for $($Guitar existingGuitar : guitars$)\{$

if $($existingGuitar$.$brand.equals$($guitar$.$brand$)$ && existingGuitar.model.equals$($guitar$.$model$))\{$

existingGuitar.stockNumber$++$;

return;

$\}$

$\}$

guitars.add$($guitar$)$;

$\}$

public Guitar searchGuitar$($String brand, String model, double price$)\{$

for $($Guitar guitarItem : guitars$)\{$

if $($guitarItem$.$brand $==$ brand && guitarItem.model $==$ model && guitarItem.price $==$ price$)\{$

return guitarItem;

$\}$

$\}$

return null;

$\}$

$\}$

public class Main $\{$

public static void main$($String$[]$ args$)\{$

Inventory inventoryList $=$ new Inventory$()$;

Guitar guitar$1=$ new Guitar$("$Purple$",$ "Fender", $"$A$573$H$",880\mathrm{.}00,$ false, "Warehouse$1",6)$;

inventoryList.addGuitar$($guitar$1)$;

Guitar guitar$2=$ new Guitar$("$Yellow$",$ "Yamaha", $"$B$032$T$",1300\mathrm{.}00,$ true, "Warehouse$2",5)$;

inventoryList.addGuitar$($guitar$2)$;

Guitar lookingGuitar $=$ inventoryList.searchGuitar$("$Fender$","$A$573$H$",880\mathrm{.}00)$;

if $($lookingGuitar $!=$ null$)\{$

System.out.println$("$brand: $"+$ lookingGuitar.brand $+"$ model: $"+$ lookingGuitar.model$+"$ color: $"+$lookingGuitar.color$+"$ isSecondhand: $"+$lookingGuitar.isSecondHand$+"$ price: $"+$lookingGuitar.price$+"$ Warehouse: $"+$lookingGuitar.warehouse$+"$ Stock: $"+$lookingGuitar.stockNumber$)$;

$\}$ else $\{$

System.out.println$("$Guitar not exist"$)$;

$\}$

$\}$

$\}$ This is my code, i want to create two methods in inventory, one is addguitar, when i add the same guitar $,$stocknumber increase one, another is removeguitar, stocknumber decrease one