Build an Inventory Manager in Java

PROBLEM UNDERSTANDING

Input and expected output

No input required

P1 Keyboard 7
P2 Mouse 15

COMPLETE JAVA 17 PROGRAM

Complete Java 17 implementation

import java.util.*;record Item(String name,int quantity){}class Inventory{private final Map<String,Item> items=new TreeMap<>();void add(String id,String name,int quantity){items.put(id,new Item(name,quantity));}void sell(String id,int quantity){Item item=items.get(id);if(item!=null&&item.quantity()>=quantity)items.put(id,new Item(item.name(),item.quantity()-quantity));}void print(){items.forEach((id,item)->System.out.println(id+" "+item.name()+" "+item.quantity()));}}class Main{public static void main(String[] args){Inventory inventory=new Inventory();inventory.add("P1","Keyboard",10);inventory.add("P2","Mouse",15);inventory.sell("P1",3);inventory.print();}}

PROGRAM EXPLANATION

Algorithm and explanation

1. Initialize the deterministic sample values used for build an inventory manager in java.
2. Create the required object and apply Map and Record to its state or behavior.
3. Print the final result and compare it with the documented sample output.

This Java 17 example demonstrates Map, Record, and Business rule through a complete, executable program. The values are intentionally small so students can trace each statement, verify the output, and then modify the example safely in the online compiler.

EFFICIENCY

Time and space complexity

DEBUGGING CHECKLIST

Common mistakes

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