A Java implementation of Huffman coding in two parts.

Part 1: Build the Huffman Tree BinaryHeap: Generic min-heap. HuffmanNode: Tree node with character(s) and frequency. HuffmanTree: Creates a Huffman tree from a heap; prints =code. UnderflowException: Thrown on empty-heap operations. Flow: Legend → BinaryHeap → merge min nodes → HuffmanTree → printLegend().

Part 2: Encode & Decode HuffmanConverter: recordFrequencies(): Count chars, batch-build heap, print <char, freq>. frequenciesToTree(): Build tree from counts. treeToCode(): Generate and print quoted codes ('a'=010). encodeMessage(): Print bitstring and size comparison. decodeMessage(): Restore original text.

Usage: Import into Eclipse under Huffman_Encoder. Add input .txt files to project root. Run HuffmanConverter with filename as argument.