Add Java implementation of COBOL merge sort functionality #34
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- Create CustomerRecord class with 5 fields matching COBOL structure - Implement MergeSortExample with file I/O using Java standard libraries - Replace COBOL MERGE/SORT statements with Java streams and Collections.sort() - Generate test data programmatically matching COBOL create-test-data - Support merge by ascending customer ID and sort by descending contract ID - Include comprehensive README with usage instructions and comparison table Co-Authored-By: Alex Laubscher <aclaubscher17@gmail.com>
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Add Java implementation of COBOL merge sort functionality
Summary
This PR adds a complete Java implementation that replicates the file-based merge sort functionality from
merge_sort_test.cbl. The implementation includes:The Java version uses standard libraries (Files, Collections.sort, Comparator) to replace COBOL's built-in MERGE and SORT statements while maintaining identical functionality and output format.
Review & Testing Checklist for Human
toString()method produces identical output to the COBOL version (5-digit customer ID, 50-char names, etc.)fromString()correctly parses the fixed-width format with proper substring indices (0-5, 5-55, 55-105, 105-110, 110-135)create-test-datasectionNotes
Link to Devin run: https://app.devin.ai/sessions/69819eabcf264f36975079cecf7cf40f
Requested by: @alexlaubscher
The implementation has been tested locally and produces the expected output files with correct sorting behavior. The most critical aspect to review is the fixed-width formatting compatibility since any discrepancies could cause data corruption when interfacing with COBOL systems.