Posts (238+)

Browse the full archive. Use topics in the sidebar to explore by tag.

September 2026

Adapter:Make Incompatible Types Talk

Wrap a vendor client whose methods do not match PaymentGateway so OrderProcessor keeps calling charge(Order, BigDecimal) and never learns PayPal’s shape.

Git

Find the Break:git bisect When Something Stopped Working

Hands-on git bisect — binary-search commits to find the first one that broke a working check, then reset HEAD and optionally automate the walk.

Git

Cherry-Pick:Move One Commit Without Merging the Branch

Copy one commit onto another branch — bring a hotfix from main onto your feature without merging the rest of main.

Git

Review Before Merge:Pull Requests on the Host Without the Guesswork

Open a pull request, read the host diff, merge on GitHub or GitLab, then pull main locally so review happens before the default branch moves.

Git

Git Rebase:Replay Your Branch Without a Merge Commit

Hands-on Git rebase — fetch an updated main, replay your feature commits on top of it, and skip the extra merge commit.

Git

Reset Too Far:Recover Commits With git reflog

Hands-on Git — recover a commit after a reset that went too far, using git reflog to restore HEAD or create a recovery branch.

Git

Git Stash:Park Uncommitted Work Without a Fake Commit

Hands-on Git stash — park a dirty working tree, switch branches, and restore the work without a fake WIP commit.

Java

Your Key Vanished From the Map:`equals` and `hashCode` Without the Interview Checklist

Implement equals and hashCode so HashMap and HashSet can find the key you put — Object contract, records, and why a mutable id loses the entry.

Java

Exceptions:Checked, Unchecked, and When `throw` Beats `return`

Choose throw over a sentinel return, close resources with try-with-resources, and wrap checked exceptions at lambda boundaries instead of swallowing them.

Java

Generics:Write `List<Order>` Once and Mean It

Use Java generics so List of Order stays a list of orders — type parameters, PECS, erasure, and why raw types still compile.