Implement The Use of Arrays and Characters in Java Assignment Solution

Instructions

Objective

Write a java assignment program to work with arrays and characters.

Requirements and Specifications

Screenshot

Source Code

QUESTION 1 package javatest; import javatest.exception.EndOfStreamException; import javatest.reader.CharacterReader; import javatest.reader.SimpleCharacterReader; import java.util.*; public class Q1 { public static void main(String[] args) { Map map = new HashMap<>(); StringBuilder builder = new StringBuilder(); CharacterReader reader = new SimpleCharacterReader(); try { while(true) { char c = reader.getNextChar(); if (Character.isAlphabetic(c)) { builder.append(builder.length() == 0 ? Character.toUpperCase(c) : Character.toLowerCase(c)); } else { if (builder.length() > 0) { map.merge(builder.toString(), 1, Integer::sum); builder = new StringBuilder(); } } } } catch (EndOfStreamException e) { if (builder.length() > 0) { map.merge(builder.toString(), 1, Integer::sum); } } List> pairs = new ArrayList<>(map.entrySet()); pairs.sort((o1, o2) -> { int diff = o2.getValue() - o1.getValue(); if (diff == 0) { return o1.getKey().compareTo(o2.getKey()); } return diff; }); for (Map.Entry pair : pairs) { System.out.println(pair.getKey() + " - " + pair.getValue()); } } } QUESTION 2 package javatest; import javatest.exception.EndOfStreamException; import javatest.reader.CharacterReader; import javatest.reader.SimpleCharacterReader; import javatest.reader.SlowCharacterReader; import java.util.*; public class Q2 { private static final Map map = new HashMap<>(); private static boolean[] completed; private static void printState() { List> pairs; synchronized (map) { pairs = new ArrayList<>(map.entrySet()); } pairs.sort((o1, o2) -> { int diff = o2.getValue() - o1.getValue(); if (diff == 0) { return o1.getKey().compareTo(o2.getKey()); } return diff; }); for (Map.Entry pair : pairs) { System.out.println(pair.getKey() + " - " + pair.getValue()); } } public static void main(String[] args) { int threadNum = 10; Thread[] threads = new Thread[threadNum]; completed = new boolean[threadNum]; for (int i = 0; i < threadNum; i++) { final int index = i; threads[i] = new Thread(() -> { CharacterReader reader = new SlowCharacterReader(); StringBuilder builder = new StringBuilder(); try { while (true) { char c = reader.getNextChar(); if (Character.isAlphabetic(c)) { builder.append(builder.length() == 0 ? Character.toUpperCase(c) : Character.toLowerCase(c)); } else { if (builder.length() > 0) { synchronized (map) { map.merge(builder.toString(), 1, Integer::sum); } builder = new StringBuilder(); } } } } catch (EndOfStreamException e) { if (builder.length() > 0) { synchronized (map) { map.merge(builder.toString(), 1, Integer::sum); } } completed[index] = true; } }); threads[i].start(); } long startTime = System.currentTimeMillis(); long seconds = 0; while(true) { boolean stop = true; for (boolean b : completed) { if (!b) { stop = false; break; } } if (stop) { break; } if ((System.currentTimeMillis() - startTime) / 1000 >= (seconds + 10)) { seconds += 10; printState(); System.out.println(); } } for (int i = 0; i < threadNum; i++) { try { threads[i].join(); } catch (Exception ignored) { } } System.out.println("Final:"); printState(); } }