derusting assignment

src/ArrayPractice.java

@@ -1,18 +1,36 @@
+//Shawn Nguru
 public class ArrayPractice {
   public static void main(String[] args) {
-    // Create an array of Strings of size 4
 
-    // Set the value of the array at each index to be a different String
-    // It's OK to do this one-by-one
+        System.out.println("***************************************************");
+        // Create an array of Strings of size 4
+        String[] names = {"Kaladin", "Sam", "David", "Paul"};
 
-    // Get the value of the array at index 2
+        // Set the value of the array at each index to be a different String
+        // It's OK to do this one-by-one
+        names[0] = "Kal";
+        names[1] = "Sammy";
+        names[2] = "Dave";
+        names[3] = "Saul";
 
-    // Get the length of the array
 
-    // Iterate over the array using a traditional for loop and print out each item
+        // Get the value of the array at index 2
+        System.out.println(names[2]);
 
-    // Iterate over the array using a for-each loop and print out each item
+        // Get the length of the array
+        int length = names.length;
 
+        // Iterate over the array using a traditional for loop and print out each item
+        for(int i = 0; i < length; i++)
+        {
+            System.out.println(names[i]);
+        }
+
+        // Iterate over the array using a for-each loop and print out each item
+        for(String tag : names)
+        {
+            System.out.println(tag);
+        }
     /*
      * Reminder!
      * 

src/ListPractice.java

@@ -1,27 +1,52 @@
+//Shawn Nguru
 public class ListPractice {
 
 
   public static void main(String[] args) {
-    // Create an empty ArrayList of Strings and assign it to a variable of type List
+        // Create an empty ArrayList of Strings and assign it to a variable of type List
+        ArrayList<String> list = new ArrayList<String>();
+
+        // Add 3 elements to the list (OK to do one-by-one)
+        list.add("one");
+        list.add("two");
+        list.add("three");
+
+        // Print the element at index 1
+        System.out.println(list.get(1));
+
+        // Replace the element at index 1 with a new value
+        // (Do not insert a new value. The length of the list should not change)
+        list.set(1,"dos");
+        System.out.println("list: " + list);
+
+        // Insert a new element at index 0 (the length of the list will change)
+        list.add(0,"zero");
+        System.out.println("list: " + list);
+
+        // Check whether the list contains a certain string
+        if(list.contains("three"))
+        {
+            System.out.println("It contains that value!");
+        }
+
+        // Iterate over the list using a traditional for-loop.
+        // Print each index and value on a separate line
+
+        for(int i = 0; i < list.size(); i++)
+        {
+            System.out.println(i+".) " + list.get(i));
+        }
+
+        // Sort the list using the Collections library
+        Collections.sort(list);
+
+        // Iterate over the list using a for-each loop
+        // Print each value on a second line
+        for(String i : list)
+        {
+            System.out.println(i);
+        }
 
-    // Add 3 elements to the list (OK to do one-by-one)
-
-    // Print the element at index 1
-
-    // Replace the element at index 1 with a new value
-    // (Do not insert a new value. The length of the list should not change)
-
-    // Insert a new element at index 0 (the length of the list will change)
-
-    // Check whether the list contains a certain string
-
-    // Iterate over the list using a traditional for-loop.
-    // Print each index and value on a separate line
-
-    // Sort the list using the Collections library
-
-    // Iterate over the list using a for-each loop
-    // Print each value on a second line
 
     /*
      * Usage tip!

src/MapPractice.java

@@ -1,28 +1,55 @@
-
-
+//Shawn Nguru
 public class MapPractice {
   public static void main(String[] args) {
-    // Create a HashMap with String keys and Integer values and
-    // assign it to a variable of type Map
-
-    // Put 3 different key/value pairs in the Map
-    // (it's OK to do this one-by-one)
-
-    // Get the value associated with a given key in the Map
+        // Create a HashMap with String keys and Integer values and
+        // assign it to a variable of type Map
+        Map<String,Integer> maps = new HashMap<>();
 
-    // Find the size (number of key/value pairs) of the Map
+        // Put 3 different key/value pairs in the Map
+        // (it's OK to do this one-by-one)
+        maps.put("Kal",1);
+        maps.put("Dalinar",2);
+        maps.put("Shallan",3);
 
-    // Replace the value associated with a given key (the size of the Map shoukld not change)
+        // Get the value associated with a given key in the Map
+        System.out.println(maps.get("Dalinar"));
 
-    // Check whether the Map contains a given key
+        // Find the size (number of key/value pairs) of the Map
+        System.out.println(maps.size());
 
-    // Check whether the Map contains a given value
+        // Replace the value associated with a given key (the size of the Map should not change)
+        maps.put("Kal",100);
+        System.out.println(maps);
 
-    // Iterate over the keys of the Map, printing each key
+        // Check whether the Map contains a given key
+        if(maps.containsKey("Dalinar"))
+        {
+            System.out.println("The Goat");
+        }
+        // Check whether the Map contains a given value
+        if(maps.containsValue(1))
+        {
+            System.out.println("Kal The Goat");
+        }
+        else System.out.println("N/A");
 
-    // Iterate over the values of the map, printing each value
+        // Iterate over the keys of the Map, printing each key
+        for(String i : maps.keySet())
+        {
+            System.out.println(i);
+        }
+        // Iterate over the values of the map, printing each value
+        for(Integer i : maps.values())
+        {
+            System.out.println(i);
+        }
 
-    // Iterate over the entries in the map, printing each key and value
+        // Iterate over the entries in the map, printing each key and value
+        for(String i : maps.keySet())
+        {
+            System.out.println("Key: " + i);
+            System.out.println("Value: " + maps.get(i));
+        }
 
     /*
      * Usage tip!

src/NumberPractice.java

@@ -1,17 +1,34 @@
+//Shawn Nguru
 public class NumberPractice {
   public static void main(String args[]) {
-    // Create a float with a negative value and assign it to a variable
+        // Create a float with a negative value and assign it to a variable
+        float negativeVal = -12;
 
-    // Create an int with a positive value and assign it to a variable
+        // Create an int with a positive value and assign it to a variable
+        int positiveVal = 3;
 
-    // Use the modulo % operator to find the remainder when the int is divided by 3
+        // Use the modulo % operator to find the remainder when the int is divided by 3
+        System.out.println(positiveVal%3);
 
-    // Use the modulo % operator to determine whether the number is even
-    // (A number is even if it has a remainder of zero when divided by 2)
-    // Use an if-else to print "Even" if the number is even and "Odd"
-    // if the number is odd.
+        // Use the modulo % operator to determine whether the number is even
+        // (A number is even if it has a remainder of zero when divided by 2)
+        // Use an if-else to print "Even" if the number is even and "Odd"
+        // if the number is odd.
+        if(negativeVal%2 ==0)
+        {
+            System.out.println("Even");
+        }
+        System.out.println("Odd");
 
-    // Divide the number by another number using integer division
+        // Divide the number by another number using integer division
+        float solution = positiveVal/negativeVal;
+        /*
+         * Reminder!
+         *
+         * When dividing ints, the result is rounded down.
+         * Example:
+         * 7 / 3 = 2 when performing int division
+         */
 
     /*
      * Reminder!

src/Person.java

@@ -1,53 +1,105 @@
+//Shawn Nguru
 /*
  * In this file you will follow the comments' instructions to complete
  * the Person class.
  */
 
 public class Person {
-  // Declare a public String instance variable for the name of the person
-  // Declare a private int instance variable for the age of the person
+    // Declare a public String instance variable for the name of the person
+    public String name;
+    // Declare a private int instance variable for the age of the person
+    private int age;
 
+    // Create a constructor that takes the name and age of the person
+    // and assigns it to the instance variables
 
-  // Create a constructor that takes the name and age of the person
-  // and assigns it to the instance variables
+    Person(String name, int age)
+    {
+        this.name = name;
+        this.age = age;
+    }
 
 
-  // Create a toString method that gives the name and age of the person
+    // Create a toString method that gives the name and age of the person
+    public String toString()
+    {
+        return name + " " + age;
+    }
 
 
-  // Implement the below public instance method "birthYear"
-  // There should NOT be any print statement in this method.
-  /**
-   * birthYear returns the year the person was born.
-   * 
-   * The birth year is calculated by subtracting the person's age from currentYear
-   * that's passed in as an int. It assumes that the person's birthday has already
-   * passed this year.
-   * 
-   * @param currentYear an int for the current year
-   * @return The year the person was born
-   */
-  // (create the instance method here)
+    // Implement the below public instance method "birthYear"
+    // There should NOT be any print statement in this method.
+    /**
+     * birthYear returns the year the person was born.
+     *
+     * The birth year is calculated by subtracting the person's age from currentYear
+     * that's passed in as an int. It assumes that the person's birthday has already
+     * passed this year.
+     *
+     * @param currentYear an int for the current year
+     * @return The year the person was born
+     */
 
+    public int birthYear(int currentYear)
+    {
+        return currentYear - age;
+    }
+}
 
   public static void main(String[] args) {
-    // Create an instance of Person
-
-    // Create another instance of Person with a different name and age and
-    // assign it to a different variable
-
-    // Print the first person
-
-    // Print the second person
-
-    // Get the name of the first person and store it in a local variable
-
-    // Using the birthYear method, get the birth year of the first person
-    // and store it in a local variable. Input the actual current year (e.g. 2025)
-    // as the argument.
-
-    // In a separate statement, print the local variable holding the birth year.
-
+        Person dude = new Person("Shawn",22);
+        Person girl = new Person("Alex",23);
+
+        // Create another instance of Person with a different name and age and
+        // assign it to a different variable
+
+        // Print the first person
+        System.out.println(dude);
+        // Print the second person
+        System.out.println(girl);
+
+        // Get the name of the first person and store it in a local variable
+        String name = dude.name;
+        // Using the birthYear method, get the birth year of the first person
+        // and store it in a local variable. Input the actual current year (e.g. 2025)
+        // as the argument.
+
+        // In a separate statement, print the local variable holding the birth year.
+        int age = dude.birthYear(2025);
+        System.out.println(age);
+        System.out.println("***************************************************");
+        /**
+         * Person
+         */
+
+        // Create a float with a negative value and assign it to a variable
+        float negativeVal = -12;
+
+        // Create an int with a positive value and assign it to a variable
+        int positiveVal = 3;
+
+        // Use the modulo % operator to find the remainder when the int is divided by 3
+        System.out.println(positiveVal%3);
+
+        // Use the modulo % operator to determine whether the number is even
+        // (A number is even if it has a remainder of zero when divided by 2)
+        // Use an if-else to print "Even" if the number is even and "Odd"
+        // if the number is odd.
+        if(negativeVal%2 ==0)
+        {
+            System.out.println("Even");
+        }
+        System.out.println("Odd");
+
+        // Divide the number by another number using integer division
+        float solution = positiveVal/negativeVal;
+        /*
+         * Reminder!
+         *
+         * When dividing ints, the result is rounded down.
+         * Example:
+         * 7 / 3 = 2 when performing int division
+         */
     /**
      * Terminology!
      *