1 test not passing

src/main/java/rocks/zipcode/quiz4/arrays/ArrayUtils.java

@@ -5,18 +5,34 @@
  */
 public class ArrayUtils {
     public static String getMiddleElement(String[] values) {
-        return null;
+        return values[values.length/2];
     }
 
     public static String[] removeMiddleElement(String[] values) {
-        return null;
+        Integer cnt = 0;
+        String[] result = new String[values.length-1];
+        values[values.length/2] = null;
+        for (int i = 0; i <values.length ; i++) {
+            if (values[i] != null){
+                result[cnt]=values[i];
+                cnt++;
+            }
+        }
+        return result;
     }
 
     public static String getLastElement(String[] values) {
-        return null;
+        return values[values.length-1];
     }
 
     public static String[] removeLastElement(String[] values) {
-        return null;
+        String[] result = new String[values.length-1];
+        values[values.length-1] = null;
+        for (int i = 0; i <values.length ; i++) {
+            if (values[i] != null){
+                result[i]=values[i];
+            }
+        }
+        return result;
     }
 }

src/main/java/rocks/zipcode/quiz4/collections/WordCounter.java

@@ -1,12 +1,26 @@
 package rocks.zipcode.quiz4.collections;
 
+import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.Map;
 
 public class WordCounter {
+    HashMap<String,Integer> result = new HashMap<>();
+
     public WordCounter(String... strings) {
+        for (String item : strings){
+            if(result.containsKey(item)){
+
+                Integer count = result.get(item);
+                result.put(item,count+1);
+
+            }else{
+                result.put(item,1);
+            }
+        }
     }
 
     public Map<String, Integer> getWordCountMap() {
-        return null;
+        return result;
     }
 }

src/main/java/rocks/zipcode/quiz4/collections/culonary/Curry.java

@@ -1,4 +1,4 @@
 package rocks.zipcode.quiz4.collections.culonary;
 
-public class Curry {
+public class Curry implements Spice {
 }

src/main/java/rocks/zipcode/quiz4/collections/culonary/Food.java

@@ -1,20 +1,33 @@
 package rocks.zipcode.quiz4.collections.culonary;
 
+import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 /**
  * @author leon on 27/12/2018.
  */
 public class Food {
+    ArrayList<Spice> spices = new ArrayList<>();
+
+
     public List<Spice> getAllSpices() {
-        return null;
+        return spices;
     }
 
     public <SpiceType extends Class<? extends Spice>> Map<SpiceType, Integer> getSpiceCount() {
-        return null;
+
+        HashMap<SpiceType,Integer> spiceCountMap = new HashMap<>();
+        SpiceType spice = (SpiceType) this.spices.get(0).getClass();
+        Integer spiceCount = this.spices.size();
+        spiceCountMap.put(spice,spiceCount);
+
+
+            return spiceCountMap;
     }
 
     public void applySpice(Spice spice) {
+        spices.add(spice);
     }
 }

src/main/java/rocks/zipcode/quiz4/collections/culonary/Ginger.java

@@ -3,5 +3,5 @@
 /**
  * @author leon on 27/12/2018.
  */
-public class Ginger {
+public class Ginger implements Spice{
 }

src/main/java/rocks/zipcode/quiz4/collections/culonary/Pepper.java

@@ -3,5 +3,5 @@
 /**
  * @author leon on 27/12/2018.
  */
-public class Pepper {
+public class Pepper implements Spice{
 }

src/main/java/rocks/zipcode/quiz4/fundamentals/Calculator.java

@@ -5,31 +5,36 @@
  */
 public class Calculator {
     public static Double squareRoot(Double value) {
-        return null;
+        return Math.sqrt(value);
     }
 
     public static Double square(Double value) {
-        return null;
+        return (Math.pow(value,2));
     }
 
     public static Double[] squareRoots(Double... value) {
-        return null;
+        for (int i = 0; i <value.length ; i++) {
+            value[i] = Math.sqrt(value[i]);
+        }
+        return value;
     }
 
     public static Double[] squares(Double... values) {
-        return null;
+        for (int i = 0; i <values.length ; i++) {
+            values[i] = values[i] * values[i];
+        }
+        return values;
     }
 
     public static Double add(Double value1, Double value2) {
-        return null;
+        return value1 + value2;
     }
 
     public static Double subtract(Double value1, Double value2) {
-        return null;
+        return value1 - value2;
     }
 
 
     public static Double divide(Double divisor, Double dividend) {
-        return null;
-    }
+        return divisor / dividend;    }
 }

src/main/java/rocks/zipcode/quiz4/fundamentals/StringUtils.java

@@ -1,34 +1,82 @@
 package rocks.zipcode.quiz4.fundamentals;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+
 /**
  * @author leon on 21/12/2018.
  */
 public class StringUtils {
     public static Character getMiddleCharacter(String string) {
-        return null;
+        char[] result = string.toCharArray();
+        return result[result.length/2];
     }
 
     public static String capitalizeMiddleCharacter(String str) {
-        return null;
-    }
+        StringBuffer sb =new StringBuffer(str);
+        char mid =Character.toUpperCase(sb.charAt(sb.length()/2));
+        sb.setCharAt(sb.length()/2, mid);
+        return sb.toString();
+        }
 
     public static String lowerCaseMiddleCharacter(String str) {
-        return null;
+        StringBuffer sb =new StringBuffer(str);
+        char mid =Character.toLowerCase(sb.charAt(sb.length()/2));
+        sb.setCharAt(sb.length()/2, mid);
+        return sb.toString();
     }
 
     public static Boolean isIsogram(String str) {
-        return null;
-    }
+        char arr[] = str.toCharArray();
+
+        Arrays.sort(arr);
+        for (int i = 0; i < str.length() - 1; i++) {
+            if (arr[i] == arr[i + 1])
+                return false;
+        }
+        return true;
+}
 
     public static Boolean hasDuplicateConsecutiveCharacters(String str) {
-        return null;
+        char arr[] = str.toCharArray();
+
+
+        for (int i = 0; i < str.length() - 1; i++) {
+            if (arr[i] == arr[i + 1])
+                return true;
+        }
+        return false;
     }
 
     public static String removeConsecutiveDuplicateCharacters(String str) {
-        return null;
-    }
+        StringBuilder stringBuilder = new StringBuilder(str);
+        for(int i = 1; i <= str.length()-1; i++){
+            if(str.charAt(i) == str.charAt(i-1)) {
+                stringBuilder.replace(i - 1, i + 1, "");
+            }
+        }
+        return stringBuilder.toString();
 
-    public static String invertCasing(String str) {
-        return null;
     }
+
+
+        public static String invertCasing(String str) {
+            char[] chars = str.toCharArray();
+            for (int i = 0; i < chars.length; i++)
+            {
+                char c = chars[i];
+                if (Character.isUpperCase(c))
+                {
+                    chars[i] = Character.toLowerCase(c);
+                }
+                else if (Character.isLowerCase(c))
+                {
+                    chars[i] = Character.toUpperCase(c);
+                }
+            }
+            return new String(chars);
+        }
+
+
 }

src/main/java/rocks/zipcode/quiz4/objectorientation/account/Account.java

@@ -3,11 +3,14 @@
 /**
  * @author leon on 30/12/2018.
  */
-public class Account extends BankAccount {
+public class Account {
+    private Long id;
+
     public Long getId() {
-        return null;
+        return this.id;
     }
 
     public void setId(Long id) {
+        this.id = id;
     }
 }

src/main/java/rocks/zipcode/quiz4/objectorientation/account/Bank.java

@@ -1,17 +1,30 @@
 package rocks.zipcode.quiz4.objectorientation.account;
 
+import java.util.ArrayList;
+
 /**
  * @author leon on 27/12/2018.
  */
 public class Bank {
-    public BankAccount removeBankAccountByIndex(Integer indexNumber) {
-        return null;
+    ArrayList<BankAccount> accounts = new ArrayList<>();
+
+    public Boolean removeBankAccountByIndex(Integer indexNumber) {
+        BankAccount temp = null;
+
+        if (accounts.size() > 0 && indexNumber <= accounts.size()){
+            temp = accounts.get(indexNumber);
+            accounts.remove(temp);
+
+        }
+       return containsBankAccount(temp);
     }
 
     public void addBankAccount(BankAccount bankAccount) {
+        accounts.add(bankAccount);
+
     }
 
     public Boolean containsBankAccount(BankAccount bankAccount) {
-        throw new UnsupportedOperationException("Method not yet implemented");
+       return accounts.contains(bankAccount);
     }
 }

src/main/java/rocks/zipcode/quiz4/objectorientation/account/BankAccount.java

@@ -3,7 +3,41 @@
 /**
  * @author leon on 27/12/2018.
  */
-public class BankAccount {
+public class BankAccount extends Account implements Transactable {
+    Double balance;
+
+    public BankAccount() {
+        this.balance = 0.0;
+    }
+
     public void setBalance(Double val) {
+        this.balance = val;
+    }
+
+    @Override
+    public void deposit(Double amountToIncreaseBy)   {
+
+        if (amountToIncreaseBy < 0.0){
+            throw new IllegalArgumentException();
+        }else{
+            balance += amountToIncreaseBy;
+
+        }
+    }
+
+    @Override
+    public void withdrawal(Double amountToDecreaseBy) {
+        if (amountToDecreaseBy < 0.0 || amountToDecreaseBy > balance) {
+            throw new IllegalArgumentException();
+
+        }else{
+            balance -= amountToDecreaseBy;
+        }
+
+    }
+
+    @Override
+    public Double getBalance() {
+        return balance;
     }
 }