The original title is "I Built an AI-Powered CLI That Migrates Legacy Java Code to Java 17/21/25"

Short summary

A developer built java-migrate, a CLI tool that scans legacy Java files for outdated patterns and uses Claude to modernize them to Java 17/21/25 syntax. The tool detects patterns like anonymous inner classes, verbose null checks, and old switch statements, then generates diffs with migration notes. It supports dry-run mode and uses a regex-based scanner before calling the Claude API.

• •java-migrate CLI uses Claude to modernize legacy Java code automatically
• •Detects patterns like anonymous classes, instanceof casts, and old switch statements
• •Supports dry-run mode with diffs and migration notes before writing changes

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