Derusting

src/ArrayPractice.java

@@ -1,18 +1,28 @@
+/* Name: Anthony Kravchishin */
+import java.util.*;
+
 public class ArrayPractice {
   public static void main(String[] args) {
     // Create an array of Strings of size 4
-
+    String[] list = new String[4];
     // Set the value of the array at each index to be a different String
     // It's OK to do this one-by-one
-
+    list[0] = "First";
+    list[1] = "Second";
+    list[2] = "Third";
+    list[3] = "end";
     // Get the value of the array at index 2
-
+    System.out.println(list[2]);
     // Get the length of the array
-
+    System.out.println(list.length);
     // Iterate over the array using a traditional for loop and print out each item
-
+    for (int i = 0; i < list.length; i++) {
+      System.out.println(list[i]);
+    }
     // Iterate over the array using a for-each loop and print out each item
-
+    for (String item : list) {
+        System.out.println(item);
+    }
     /*
      * Reminder!
      * 

src/ListPractice.java

@@ -1,28 +1,36 @@
+/* Name: Anthony Kravchishin */
+import java.util.*;
 public class ListPractice {
 
 
   public static void main(String[] args) {
     // Create an empty ArrayList of Strings and assign it to a variable of type List
-
+    List<String> list = new ArrayList<>();
     // 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, "Not Two");
     // Insert a new element at index 0 (the length of the list will change)
-
+    list.add(0, "Zero");
     // Check whether the list contains a certain string
-
+    System.out.println(list.contains("Two"));
     // 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(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 item : list) {
+      System.out.println(item);
+    }
     /*
      * Usage tip!
      * 

src/MapPractice.java

@@ -1,29 +1,37 @@
-
-
+/* Name: Anthony Kravchishin */
+import java.util.*;
 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
-
+    Map<String, Integer> map = new HashMap<>();
     // Put 3 different key/value pairs in the Map
     // (it's OK to do this one-by-one)
-
+    map.put("First", 1);
+    map.put("Second", 2);
+    map.put("Third", 3);
     // Get the value associated with a given key in the Map
-
+    System.out.println(map.get("Third"));
     // Find the size (number of key/value pairs) of the Map
-
+    System.out.println(map.size());
     // Replace the value associated with a given key (the size of the Map shoukld not change)
-
+    map.replace("First", 11);
     // Check whether the Map contains a given key
-
+    System.out.println(map.containsKey("First"));
     // Check whether the Map contains a given value
-
+    System.out.println(map.containsValue(1));
     // Iterate over the keys of the Map, printing each key
-
+    for (String key : map.keySet()) {
+      System.out.println(key);
+    }
     // Iterate over the values of the map, printing each value
-
+    for (Integer value : map.values()) {
+      System.out.println(value);
+    }
     // Iterate over the entries in the map, printing each key and value
-
+    for (Map.Entry<String, Integer> entry : map.entrySet()) {
+      System.out.println(entry.getKey() + " " + entry.getValue());
+    }
     /*
      * Usage tip!
      * 

src/NumberPractice.java

@@ -1,18 +1,24 @@
+/* Name: Anthony Kravchishin */
 public class NumberPractice {
   public static void main(String args[]) {
     // Create a float with a negative value and assign it to a variable
-
+    float negative = -1.5f;
     // Create an int with a positive value and assign it to a variable
-
+    int positive = 10;
     // Use the modulo % operator to find the remainder when the int is divided by 3
-
+    System.out.println(positive%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)
+    System.out.println(positive%2);
     // Use an if-else to print "Even" if the number is even and "Odd"
     // if the number is odd.
-
+    if (positive%2 == 0) {
+      System.out.println("Even");
+    } else {
+      System.out.println("Odd");
+    }
     // Divide the number by another number using integer division
-
+    System.out.println(positive/5);
     /*
      * Reminder!
      * 

src/Person.java

@@ -1,3 +1,5 @@
+/* Name: Anthony Kravchishin */
+import java.util.*;
 /*
  * In this file you will follow the comments' instructions to complete
  * the Person class.
@@ -6,13 +8,37 @@
 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
-
+  public String name;
+  private int age;
 
   // Create a constructor that takes the name and age of the person
   // and assigns it to the instance variables
+  public Person(String name, int age) {
+    this.name = name;
+    this.age = age;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
 
+  public int getAge() {
+    return age;
+  }
+
+  public void setAge(int age) {
+    this.age = age;
+  }
 
   // Create a toString method that gives the name and age of the person
+  @Override
+  public String toString() {
+    return "Person [" + name + ", " + age + "]";
+  }
 
 
   // Implement the below public instance method "birthYear"
@@ -28,26 +54,29 @@ public class Person {
    * @return The year the person was born
    */
   // (create the instance method here)
-
+  public int birthYear(int currentYear) {
+    return currentYear - age;
+  }
 
   public static void main(String[] args) {
     // Create an instance of Person
-
+    Person p = new Person("Quinn", 21);
     // Create another instance of Person with a different name and age and
     // assign it to a different variable
-
+    Person q = new Person("Paul", 33);
     // Print the first person
-
+    System.out.println(p.toString());
     // Print the second person
-
+    System.out.println(q.toString());
     // Get the name of the first person and store it in a local variable
-
+    String name = p.getName();
     // 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.
-
+    int birth = p.birthYear(2025);
+    System.out.println(2025);
     // In a separate statement, print the local variable holding the birth year.
-
+    System.out.println(birth);
     /**
      * Terminology!
      * 
@@ -63,4 +92,5 @@ public static void main(String[] args) {
      * Each instance has its own instance variables: Auberon's age can be different from Baya's age.
      */
   }
+
 }

src/SetPractice.java

@@ -1,18 +1,24 @@
+/* Name: Anthony Kravchishin */
+import java.util.*;
 public class SetPractice {
   public static void main(String[] args) {
     // Create a HashSet of Strings and assign it to a variable of type Set
-
+    HashSet<String> set = new HashSet<>();
     // Add 3 elements to the set
     // (It's OK to do it one-by-one)
-
+    set.add("Small");
+    set.add("Medium");
+    set.add("Large");
     // Check whether the Set contains a given String
-
+    System.out.println(set.contains("Small"));
     // Remove an element from the Set
-
+    set.remove("Large");
     // Get the size of the Set
-
+    System.out.println(set.size());
     // Iterate over the elements of the Set, printing each one on a separate line
-
+    for (String s : set) {
+      System.out.println(s);
+    }
     /*
      * Warning!
      * 

src/StringPractice.java

@@ -1,26 +1,34 @@
+/* Name: Anthony Kravchishin */
+import java.util.*;
 public class StringPractice {
   public static void main(String[] args) {
     // Create a string with at least 5 characters and assign it to a variable
-
+    String str = "Hello";
     // Find the length of the string
-
+    System.out.println(str.length());
     // Concatenate (add) two strings together and reassign the result
-
+    str += " world";
+    System.out.println(str);
     // Find the value of the character at index 3
-
+    System.out.println(str.charAt(3));
     // Check whether the string contains a given substring (i.e. does the string have "abc" in it?)
-
+    System.out.println(str.contains("abc"));
     // Iterate over the characters of the string, printing each one on a separate line
-
+    for (int i = 0; i < str.length(); i++) {
+      System.out.println(str.charAt(i));
+    }
     // Create an ArrayList of Strings and assign it to a variable
-
+    List<String> list = new ArrayList<>();
     // Add multiple strings to the List (OK to do one-by-one)
-
+    list.add("This");
+    list.add("is");
+    list.add("list");
+    list.add("This");
     // Join all of the strings in the list together into a single string separated by commas
     // Use a built-in method to achieve this instead of using a loop
-
+    System.out.println(String.join(",", list));
     // Check whether two strings are equal
-
+    System.out.println(list.get(0) == list.get(3));
     /*
      * Reminder!
      *