Part 1 and 2

pom.xml

@@ -7,6 +7,18 @@
     <groupId>io.zipcoder</groupId>
     <artifactId>collections</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
     <dependencies>
         <dependency>

src/main/java/io/zipcoder/ParenChecker.java

@@ -1,4 +1,50 @@
 package io.zipcoder;
 
+import java.util.Stack;
+
 public class ParenChecker {
+    Stack<Character> stack = new Stack<Character>();
+
+    public ParenChecker() {
+    }
+
+    public boolean parenChecker(String s){
+        for(int i = 0; i < s.length(); i++){
+            char c = s.charAt(i);
+            if(c == '(' ){
+                stack.push(c);
+            }else if(c == ')'){
+                if(stack.isEmpty() || stack.pop() != '('){
+                    return false;
+                }
+            }
+        }
+        return stack.isEmpty();
+    }
+    public boolean pairChecker(String s){
+        for(int i = 0; i < s.length(); i++){
+            char c = s.charAt(i);
+            if(c == '(' || c == '{' || c == '[' || c == '<' || c == '\'' || c == '\"') {
+                stack.push(c);
+            }else if(c == ')') {
+                if (stack.isEmpty() || stack.pop() != '(') return false;
+            }
+            else if(c == '}'){
+                if(stack.isEmpty() || stack.pop() != '{') return false;
+            }
+            else if(c == ']'){
+                if(stack.isEmpty() || stack.pop() != '[') return false;
+            }
+            else if(c == '>'){
+                if(stack.isEmpty() || stack.pop() != '<') return false;
+            }
+            else if(c == '\''){
+                if(stack.isEmpty() || stack.pop() != '\'') return false;
+            }
+            else if(c == '\"'){
+                if(stack.isEmpty() || stack.pop() != '\"') return false;
+            }
+        }
+        return stack.isEmpty();
+    }
 }

src/main/java/io/zipcoder/WC.java

@@ -2,15 +2,18 @@
 
 import java.io.FileNotFoundException;
 import java.io.FileReader;
-import java.util.Iterator;
-import java.util.Scanner;
+import java.util.*;
+import java.util.stream.Collectors;
 
 public class WC {
     private Iterator<String> si;
 
+    Map<String, Integer> wordMap = new HashMap<>();
+    ArrayList<String> words = new ArrayList<>();
+
     public WC(String fileName) {
         try {
-            this.si = new Scanner(new FileReader(fileName));
+            this.si = new Scanner(new FileReader(fileName)).useDelimiter("[^A-Za-z]+");
         } catch (FileNotFoundException e) {
             System.out.println(fileName + " Does Not Exist");
             System.exit(-1);
@@ -20,4 +23,40 @@ public WC(String fileName) {
     public WC(Iterator<String> si) {
         this.si = si;
     }
+
+    public void splitFile() {
+        String eachWord;
+        while (si.hasNext()) {
+            eachWord = si.next();
+            words.add(eachWord.toLowerCase());
+        }
+    }
+
+    public Map<String, Integer> wordCount() {
+        for (String s : words) {
+            Integer freq = wordMap.get(s);
+            wordMap.put(s, (freq == null) ? 1 : freq + 1);
+        }
+        return wordMap;
+    }
+
+    public Map<String, Integer> sortedMap() {
+        Map<String, Integer>
+                myMap = wordMap
+                .entrySet()
+                .stream()
+                .sorted(Collections.reverseOrder(Map.Entry.comparingByValue()))
+                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (e1, e2) -> e2, LinkedHashMap::new));
+
+        return myMap;
+    }
+
+
+    public String getSi() {
+        while (si.hasNext()) {
+            String currentString = si.next();
+            return currentString;
+        }
+        return null;
+    }
 }

src/main/resources/SomeOtherTextFile.txt

@@ -0,0 +1 @@
+Hiya! This this is is a test.

src/main/resources/someTextFile.txt

@@ -0,0 +1,51 @@
+But this murder--was it to dog him all his life?  Was he always to be
+burdened by his past?  Was he really to confess?  Never.  There was
+only one bit of evidence left against him.  The picture itself--that
+was evidence.  He would destroy it.  Why had he kept it so long?  Once
+it had given him pleasure to watch it changing and growing old.  Of
+late he had felt no such pleasure.  It had kept him awake at night.
+When he had been away, he had been filled with terror lest other eyes
+should look upon it.  It had brought melancholy across his passions.
+Its mere memory had marred many moments of joy.  It had been like
+conscience to him.  Yes, it had been conscience.  He would destroy it.
+
+He looked round and saw the knife that had stabbed Basil Hallward.  He
+had cleaned it many times, till there was no stain left upon it.  It
+was bright, and glistened.  As it had killed the painter, so it would
+kill the painter's work, and all that that meant.  It would kill the
+past, and when that was dead, he would be free.  It would kill this
+monstrous soul-life, and without its hideous warnings, he would be at
+peace.  He seized the thing, and stabbed the picture with it.
+
+There was a cry heard, and a crash.  The cry was so horrible in its
+agony that the frightened servants woke and crept out of their rooms.
+Two gentlemen, who were passing in the square below, stopped and looked
+up at the great house.  They walked on till they met a policeman and
+brought him back.  The man rang the bell several times, but there was
+no answer.  Except for a light in one of the top windows, the house was
+all dark.  After a time, he went away and stood in an adjoining portico
+and watched.
+
+"Whose house is that, Constable?" asked the elder of the two gentlemen.
+
+"Mr. Dorian Gray's, sir," answered the policeman.
+
+They looked at each other, as they walked away, and sneered.  One of
+them was Sir Henry Ashton's uncle.
+
+Inside, in the servants' part of the house, the half-clad domestics
+were talking in low whispers to each other.  Old Mrs. Leaf was crying
+and wringing her hands.  Francis was as pale as death.
+
+After about a quarter of an hour, he got the coachman and one of the
+footmen and crept upstairs.  They knocked, but there was no reply.
+They called out.  Everything was still.  Finally, after vainly trying
+to force the door, they got on the roof and dropped down on to the
+balcony.  The windows yielded easily--their bolts were old.
+
+When they entered, they found hanging upon the wall a splendid portrait
+of their master as they had last seen him, in all the wonder of his
+exquisite youth and beauty.  Lying on the floor was a dead man, in
+evening dress, with a knife in his heart.  He was withered, wrinkled,
+and loathsome of visage.  It was not till they had examined the rings
+that they recognized who it was.

src/test/java/io/zipcoder/ParenCheckerTest.java

@@ -5,4 +5,54 @@
 
 public class ParenCheckerTest {
 
+    @Test
+    public void parenCheckerTest(){
+        //Given
+        ParenChecker parenChecker = new ParenChecker();
+        String s = ")()(";
+        //When
+        boolean allPair = parenChecker.parenChecker(s);
+        //Then
+        Assert.assertFalse(allPair);
+    }
+    @Test
+    public void parenCheckerTest2(){
+        //Given
+        ParenChecker parenChecker = new ParenChecker();
+        String s = "()()";
+        //When
+        boolean hasAllPair = parenChecker.parenChecker(s);
+        //Then
+        Assert.assertTrue(hasAllPair);
+    }
+    @Test
+    public void pairCheckerTest(){
+        //Given
+        ParenChecker parenChecker = new ParenChecker();
+        String s = "{true}";
+        //When
+        boolean hasPair = parenChecker.pairChecker(s);
+        //Then
+        Assert.assertTrue(hasPair);
+    }
+    @Test
+    public void pairCheckTest2(){
+        //Given
+        ParenChecker parenChecker = new ParenChecker();
+        String s = "<False pacman mouth<";
+        //When
+        boolean hasPair = parenChecker.pairChecker(s);
+        //Then
+        Assert.assertFalse(hasPair);
+    }
+    @Test
+    public void pairCheckerTest3(){
+        //Given
+        ParenChecker parenChecker = new ParenChecker();
+        String s = "[size]";
+        //When
+        boolean hasPair = parenChecker.pairChecker(s);
+        //Then
+        Assert.assertTrue(hasPair);
+    }
 }

src/test/java/io/zipcoder/WCTest.java

@@ -1,11 +1,100 @@
 package io.zipcoder;
 
 import org.junit.Assert;
+import org.junit.Before;
 import org.junit.Test;
 
 import java.util.ArrayList;
-import java.util.Arrays;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
 
 public class WCTest {
 
+    private WC wc;
+
+    @Before
+    public void setup(){
+        wc = new WC(WC.class.getResource("/someOtherTextFile.txt").getFile());
+        wc.getSi();
+    }
+
+    @Test
+    public void splitFileTest(){
+        //Given
+        wc = new WC(WC.class.getResource("/someOtherTextFile.txt").getFile());
+        ArrayList<String> expected = new ArrayList<>();
+        expected.add("hiya");
+        expected.add("this");
+        expected.add("this");
+        expected.add("is");
+        expected.add("is");
+        expected.add("a");
+        expected.add("test");
+        //When
+        wc.splitFile();
+        //Then
+        Assert.assertEquals(expected, wc.words);
+
+    }
+    @Test
+    public void wordCountTest(){
+        //Given
+        wc = new WC(WC.class.getResource("/someOtherTextFile.txt").getFile());
+        ArrayList<String> expected1 = new ArrayList<>();
+        expected1.add("hiya");
+        expected1.add("this");
+        expected1.add("this");
+        expected1.add("is");
+        expected1.add("is");
+        expected1.add("a");
+        expected1.add("test");
+
+        Map<String, Integer> expected = new HashMap<>();
+        expected.put("hiya", 1);
+        expected.put("this", 2);
+        expected.put("is", 2);
+        expected.put("a", 1);
+        expected.put("test", 1);
+        //When
+        wc.splitFile();
+        wc.wordCount();
+        //Then
+        Assert.assertEquals(expected, wc.wordMap);
+
+    }
+    @Test
+    public void sortedMapTest(){
+        //Given
+        wc = new WC(WC.class.getResource("/someOtherTextFile.txt").getFile());
+        ArrayList<String> expected1 = new ArrayList<>();
+        expected1.add("hiya");
+        expected1.add("this");
+        expected1.add("this");
+        expected1.add("is");
+        expected1.add("is");
+        expected1.add("a");
+        expected1.add("test");
+
+        Map<String, Integer> expected2 = new HashMap<>();
+        expected2.put("hiya", 1);
+        expected2.put("this", 2);
+        expected2.put("is", 2);
+        expected2.put("a", 1);
+        expected2.put("test", 1);
+
+        Map<String, Integer> expected = new LinkedHashMap<>();
+        expected.put("hiya", 1);
+        expected.put("this", 2);
+        expected.put("is", 2);
+        expected.put("a", 1);
+        expected.put("test", 1);
+
+        //When
+        wc.splitFile();
+        wc.wordCount();
+        wc.sortedMap();
+        //Then
+        Assert.assertEquals(expected, wc.sortedMap());
+    }
 }