019-007-002

Transaction and Rollback: Recipe Ingredient Management

Easy

Problem Description

Transaction and Rollback: Recipe Ingredient Management

Learning Objective: Learn to understand transaction and rollback concepts using exception handling

Create program to update recipe ingredient inventory. Execute operations to reduce inventory of multiple ingredients, and rollback all changes if insufficient stock occurs (rollback). Using finally clause, always display final inventory state. This mechanism prevents partial inventory updates, maintaining data consistency.

Input

Line 1: Initial flour stock (g)
Line 2: Initial sugar stock (g)
Line 3: Flour used in recipe (g)
Line 4: Sugar used in recipe (g)

Output

Normal case:

=== Recipe Transaction ===
Flour: [initial]g → [after use]g
Sugar: [initial]g → [after use]g
━━━━━━━━━━━━━━━━
Transaction: Committed
Status: Recipe prepared
```java

Rollback case:
```java
=== Recipe Transaction ===
Flour: [initial]g → Operation failed
Sugar: [initial]g → Not executed
━━━━━━━━━━━━━━━━
Transaction: Rolled back
Flour: [initial]g (restored)
Sugar: [initial]g (restored)
Error: [error message]

Test Cases

※ Output examples follow programming industry standards

Input:

Expected Output:

=== Recipe Transaction ===
Flour: 1000g → 700g
Sugar: 500g → 300g
━━━━━━━━━━━━━━━━
Transaction: Committed
Status: Recipe prepared

Input:

Expected Output:

=== Recipe Transaction ===
Flour: 200g → Operation failed
Sugar: 500g → Not executed
━━━━━━━━━━━━━━━━
Transaction: Rolled back
Flour: 200g (restored)
Sugar: 500g (restored)
Error: Insufficient flour

Input:

Expected Output:

=== Recipe Transaction ===
Flour: 1000g → 700g
Sugar: 100g → Not executed
━━━━━━━━━━━━━━━━
Transaction: Rolled back
Flour: 1000g (restored)
Sugar: 100g (restored)
Error: Insufficient sugar

❌ Some tests failed

❌ エラー発生

Your Solution

Current Mode:● My Code

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    // Write your code here

    sc.close();
  }
}

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