Program Explanation Program: //import statement import java.io.*; import java.util.ArrayList; //definition of "Test" class public class Test { // declare the global variables private static final int SIZE = 2 * 128; private static BufferedInputStream inFile; private static ObjectInputStream inKey; private static DataOutputStream outFile; private static String[] charCodes; private static long originalSize, keySize; private static long readSize = 0; //definition of main method public static void main(String[] args) { //check the condition if ((args.length != 2)) { //display the statement System.out.println("Usage: java Exercise25_19 input output"); //exit statement System.exit(1); } //call the methods readHuffmanKey(args[0]); decompressFile(args[0], args[1]); //display the output System.out.println("Done!"); } //definition of "readHuffmanKey" method public static void readHuffmanKey(String inputFile) { //try-catch block try { //create an object inKey = new ObjectInputStream(new FileInputStream(inputFile)); System.out.println("sdf" + inKey); //read the original file size originalSize = inKey.readLong(); // read the key object charCodes = (String[]) (inKey.readObject()); //calculate the value for the variable keySize = (inKey.readLong()) + (Long.SIZE / 8) + 2; //close the file inKey.close(); } //catch condition catch (FileNotFoundException ex) { //display the statement System.out.println(inputFile + " file cannot be found in the folder"); } //catch condition catch (IOException ex) { //exception ex.printStackTrace(System.out); } //catch condition catch (ClassNotFoundException ex) { //exception ex.printStackTrace(System.out); } } //definition of the "decompressFile" method public static void decompressFile(String inputFile, String outputFile) { //try-catch block try { /*create an object for the input and output file*/ inFile = new BufferedInputStream(new FileInputStream(inputFile)); outFile = new DataOutputStream(new FileOutputStream(outputFile)); /* skip the key part of the compressed file*/ inFile.skip(keySize); // set the values int p = 0; String encodedText = ""; //check the condition while ((p = inFile.read()) != -1) /* read all the encoded binary text to string variable*/ encodedText += getBits(p); /*declare and set the empty string into the variable*/ String temp = ""; //check the condition for (int i = 0; i < encodedText.length(); i++) { // check the condition if (readSize == originalSize) //continue statement continue; //temporary string appended temp += encodedText.charAt(i); // check the codition for (int j = 0; j < SIZE; j++) { //check the condition if ((charCodes[j] != null) && (temp.equals(charCodes[j]))) { /* write a character to the output*/ outFile.write(j); /*increment the variable*/ readSize++; /*set the empty string to the variable*/ temp = ""; //continue statement continue; } } } // close input & output files inFile.close(); outFile.close(); } //catch condition catch (FileNotFoundException ex) { //display the statement System.out.println(inputFile + " file cannot be found in the folder"); } //catch condition catch (IOException ex) { //exception ex.printStackTrace(System.out); } } //definition of the "getBits" method public static String getBits(int value) { //declare and set the value to the variable String result = ""; int mask = 1; //check the condition for (int i = 7; i >= 0; i--) { /*declare and set the value to the variable*/ int temp = value >> i; int bit = temp & mask; //calculate the "result" value result = result + bit; } //return the value return result; } //definition of "getCharacterFrequencyForFile" method public static int[] getCharacterFrequencyForFile(String fileName) { /*declare and allocate memory for the variable*/ int[] counts = new int[SIZE]; int tempChar = 0; // try-catch block try { //allocate the memory inFile = new BufferedInputStream(new FileInputStream(fileName)); //check the condition while ((tempChar = inFile.read()) != -1) // read char by char counts[tempChar]++; // close the file after reading inFile.close(); } //catch condition catch (FileNotFoundException ex) { //display the statement System.out.println(fileName + " file cannot be found in the folder"); ex.printStackTrace(System.out); //exit System.exit(2); } //catch condition catch (IOException ex) { //exception ex.printStackTrace(System.out); } //return statement return counts; } //definition of "getHuffmanTree" method public static HuffmanTree getHuffmanTree(int[] counts) { // Create a heap to hold trees Heap<HuffmanTree> heap = new Heap<HuffmanTree>(); //check the condition for (int i = 0; i < counts.length; i++) { //check the condition if (counts[i] > 0) //add the value heap.add(new HuffmanTree(counts[i], (char)i)); } //check the condition while (heap.getSize() > 1) { //remove the smallest weight tree HuffmanTree t1 = heap.remove(); /*remove the next smallest weight tree*/ HuffmanTree t2 = heap.remove(); //combine two trees heap.add(new HuffmanTree(t1, t2)); } //return statement return heap.remove(); } //definition of "getHuffmanCode" method public static void getHuffmanCode(HuffmanTree.Node root) { //check the condition if (root == null) //return statement return; /*declare and allocate memory for the "charCodes" variable */ charCodes = new String[SIZE]; //call the method "assignCode" assignCode(root); } /* Recursively get codes to the leaf node */ public static void assignCode(HuffmanTree.Node root) { //check the condition if (root.left != null) { //calculate the left root value root...

Introduction to Java Programming and Data Structures: Brief Version (11th Global Edition)

11th Edition

ISBN: 9780134671710

Author: Y. Daniel Liang

Publisher: PEARSON

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Chapter 25 Solutions

Introduction to Java Programming and Data Structures: Brief Version (11th Global Edition)

Chapter 25.2, Problem 25.2.1CP Chapter 25.2, Problem 25.2.2CP Chapter 25.2, Problem 25.2.3CP Chapter 25.2, Problem 25.2.4CP Chapter 25.2, Problem 25.2.5CP Chapter 25.3, Problem 25.3.1CP Chapter 25.3, Problem 25.3.2CP Chapter 25.3, Problem 25.3.3CP Chapter 25.3, Problem 25.3.4CP Chapter 25.4, Problem 25.4.1CP

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