Resource Cleanup Pattern in Java: Explanation & Practice

Problem summary

Implement a pattern that ensures cleanup happens even if exception occurs.

Starter code

public class Main {
    // Simulate resource operations
    
    public static void main(String[] args) {
        // Open resource
        // Do work (may fail)
        // Always close resource
    }
}

Expected output and test cases

• Cleanup after error

  Opened
  Working...
  Error occurred
  Closed

• Cleanup after success

  Opened
  Working...
  Success
  Closed

• Open failed

  Failed to open
  Nothing to close

Hints

1. Use finally for cleanup
2. Or try-with-resources
3. Handle cleanup errors separately

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