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public class Constructors {

    // Constructors initializes a class for use
    // They must have the same name as the name of the class
    public static class Cube {

        // You can provide initial values for your instance variables like so
        // (You don't necessarily need to do this in a constructor)
        private int length = 1;
        private int width = 1;

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public class DigitalWallet {

    private static double maxWithdrawalPct = .5;

    private long accountId;
    private long balance = 0;
    private TransactionHistory transactions = new TransactionHistory();

    public DigitalWallet(long accountId) {
        this.accountId = accountId;

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public class TestDigitalWallet {

    public static void main(String[] args) {
        DigitalWallet w1 = new DigitalWallet(1);
        w1.deposit(10000);
        w1.withdraw(5000);
        DigitalWallet.setMaxWithdrawalPct(.75);
        System.out.println(w1.canWithdraw(4000)); // false

        DigitalWallet w2 = new DigitalWallet(2, 20000);

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public class Recursion {

    public static class ExampleOne
    {
        public static void main (String args[])
        {
            count(0);
        }

        public static void count (int index)

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public class BigO {

    // Big O notation is used in Computer Science to describe the performance or complexity of an algorithm.

    // Big O specifically describes the worst-case scenario, and can be used to describe
    // the execution time required or the space used

    // O(1) describes an algorithm that will always execute in the same time (or space)
    // regardless of the size of the input data set.
    private String[] strings = { "", null };

rshepherd

public class StackExercises {

    public static void main(String[] args) {
        // Reverse
        System.out.println("Reverse:");
        System.out.println(
          "12345 => " + reverse("12345") + '\n' +
          "randy => " + reverse("randy") + '\n' +
          "2 => "     + reverse("2")
        );

rshepherd

import java.util.*;

// Let me know if you find any mistakes!!

public class FinalReview {

    public static void main(String[] args) {
        System.out.println("Question 1:");
        List<String> list = new ArrayList<>();
        list.add("1");

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// Let me know if you see any mistakes!!

public class Rectangle {

    private int length;
    private int width;

    public Rectangle() {}

    public Rectangle(int width, int length) {

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class A { 
  protected int a;
  public A() {
    a = 10;
  }
}

class B extends A { 
  private int b;
  public B() {

rshepherd

String s1("1");
String s2("2");
cout << s1 << s2 << endl;