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Green Salamander CS
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Beginner Java Project Idea: Random Number Guessing Generator

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For this project, we will be creating a program which generates a random number between 1 & 100 & prompts the user to guess the number.

Steps

  1. Use the Random class to generate a random integer between 1 & 100.
  2. Use the Scanner class to prompt the user to guess the number.
  3. Create a loop to continue prompting the user for guesses until they correctly guess the number.
  4. For each guess, the program should tell the user whether the guess was too high or too low.
  5. Once the user has correctly guessed the number, output a message indicating how many guesses it took for the user to get it correct.

Motivation

By completing this project, you will learn conditional statements, loops, working with Java libraries, problem solving, designing algorithms & creating command-line programs. In the real world, generating random numbers & analyzing user input is useful across a realm of fields, including, but not limited to: games, simulations & statistical analysis.

Resources

You can use these resources & ChatGPT to get started. Additionally, if you have any questions or any issues arise, you may book a 1:1 chat or call on the main page or post a question to the forum with the issue you are experiencing.

  1. Java Tutorials: Getting Started
  2. Java API Documentation
  3. How to Use Random Class in Java

More from GreenSalamanderCS

Beginner Java Project Idea: Output a String in Reverse

For this project, we will create a Java program which can output a user input string in reverse.

Steps

  1. Create a Java project in your integrated development environment of choice.
  2. Create a StringReverser class with a method that takes in a String and returns the reversed String.
  3. In the main method of your StringReverser class, use the Scanner class to prompt the user to input a String.
  4. Call the method you defined in step 2 with the input String as an argument and output the result to the console.

Motivation

By completing this project, you will learn the following concepts:

  • Working with Java libraries
  • Creating an interface using the command-line
  • Implementing methods & functions
  • Problem-solving
  • Algorithm design

You will learn how to process text & analyze data by completing this project, which are relevant skills which are applicable to multiple real-world scenarios.

Resources

You may consult the resources below along with ChatGPT for more help:

  1. Java Tutorials: Getting Started
  2. Java API Documentation
  3. How to Reverse a String in Java
GreenSalamanderCS's post

Beginner Project Idea: Creating a Calculator in Java

For this project, we will be creating a four-function calculator that a user can use from the command line or terminal on their computer.

Steps

  1. Create a Java project in your integrated development environment of choice.
  2. Define a calculator class with necessary fields & methods for its operations (addition, subtraction, multiplication & division).
  3. Implement a method for each of the four operations which takes in two double values & returns the results of the operation.
  4. Use the scanner class to prompt the user to input two double values & the operation they would like to perform.
  5. Use the input to call the appropriate method to perform the calculation & output the result to the command line.

Motivation

By completing this project, you will learn object-oriented programming, working with Java libraries & creating command-line programs. Algorithm design & problem-solving are skills you will learn, which are critical in your pursuit to become a software developer.

Resources

You can use these resources & ChatGPT to get started. Additionally, if you have any questions or any issues arise, you may book a 1:1 chat or call on the main page or post a question to the forum with the issue you are experiencing.

  1. Java Tutorials: Getting Started
  2. Java API Documentation
  3. How to Use Scanner Class in Java
GreenSalamanderCS's post

Key Differences between Java Syntax & C Syntax

Here are some of the key differences between the syntax in C versus the syntax in Java:

  1. Both C & Java use semicolons to end statements. However, Java also uses semicolons to indicate the end of declarations.
  2. C has a preprocessor to handle macros, whereas Java doesn't have a preprocessor.
  3. In the C programming language, you must declare all your variables at the beginning of the code block, whereas with Java, you can declare your variables anywhere within the block.
  4. The C programming language allows pointers, while Java does not.
  5. The syntax with C is simple, while the syntax with Java is complex.
GreenSalamanderCS's post

AP Computer Science Topics

For those of you planning to take AP Computer Science Principles or AP Computer Science A, here are some programming concepts you can expect to learn throughout the course:

  • Primitive data types & variables
  • Control structures (conditional statements & loops)
  • Arrays & ArrayLists
  • Object-oriented programming concepts
    • Classes
    • Objects
    • Inheritance
    • Polymorphism
  • Recursion
  • Sorting & searching algorithms
  • Linked lists & other data structures
  • Exception handling
  • Interfaces & abstract classes
  • File input & output

Java is the most popular programming language throughout the AP Computer Science A course. I highly recommend learning as much Java as possible before taking the course so that you already have the basic foundation to learn the concepts more quickly when the course begins.

GreenSalamanderCS's post

Project Idea: Blockchain-based Voting System

A Blockchain-based voting system ensures secure & transparent voting, reduces the risk of voter fraud & improves democratic voting processes via the use of blockchain technology. For this project, you would need to know Ethereum, React, Node.js, Express.js & MongoDB, as well as Solidity & JavaScript.

Frameworks

  • Ethereum is used to build smart contracts using Solidity & decentralized applications. This framework is geared towards transparency & security. It is extremely popular.
  • React, Node & Express are used for developing client & server-side interactive web applications which can be updated in real time from user-input.
  • MongoDB is used for storing unstructured data as it is not a relational database model. This database management system is a NoSQL (not only SQL) system which is often used in web apps requiring scalability & flexibility. 

Algorithms

You will need to know four algorithms to create this application.

  • The Proof of Work algorithm uses a majority-agreement consensus algorithm solving a complex mathematical problem, hoarding computational resources. Ethereum uses this algorithm. All nodes in the blockchain must agree in order for the new node to be added to the blockchain. All it takes is one disagreement for the new data to be rejected.
  • The Proof of Stake algorithm gives the individual nodes in the blockchain autonomy to decide their own criteria for accepting nodes into the blockchain. Ethereum uses this algorithm. This differs from the Proof of Work algorithm as not all nodes must agree on the decision to accept or reject a node. However, favoritism can self-perpetuate, driving the blockchain to a more centralized stance.
  • The Zero-Knowledge Proofs algorithm ensures privacy & confidentiality in a transaction by allowing parties to prove a transaction's validity without revealing additional information. This algorithm is used in various payment processing systems which rely on blockchain.
  • The Ring Signature algorithm ensures anonymity by allowing a user to sign a message with a group of other users without revealing which user signed it.

Resources

If this project piques your interest, you can consult the following resources to get started. If you get stuck, you can use ChatGPT to help you devise new ideas to solve programming issues which may happen along the way.

GreenSalamanderCS's post