🎯 Unit 2 Activities

Table of Contents

💻 ACTIVITY PROGRAM SETUP INSTRUCTIONS
  1. Go to the public template repository for our class: BWL-CS Java Template
  2. Click the button above the list of files then select Create a new repository
  3. Specify the repository name: CS2-Unit-2-Activity

    Replace # with the specific activity number.

  4. Click

    Now you have your own personal copy of this starter code that you can always access under the Your repositories section of GitHub! 📂

  5. Now on your repository, click and select the Codespaces tab
  6. Click Create Codespace on main and wait for the environment to load, then you’re ready to code!

ACTIVITY #1: Magic 8 Ball 🔮

Have you ever used a Magic 8 ball? You ask it a yes-no question, and then shake it to get a random answer like Signs point to yes!, Very doubtful, etc.

Try out this Magic 8 Ball Simulator

In this activity, we will:

  • Generate and use random values correctly.
  • Practice selection with if-else if-else blocks (chain structures) and conditions (boolean values or expressions).

PART A: Printing Randomly-Selected Messages

Write a branching program inside the main() method that does the following:

  1. Declare a variable called num and assign it a random integer between 1 to 10, inclusive.

    To review generating random numbers, see 📓 1.11: Math Class

  2. Use conditional statements to test the value of num and print out a different message for each number.

    Come up with 10 creative responses to yes-no questions!

Review: if-else if-else 

if ( condition ) {
  statement1;
}
else if ( condition ) {
  statement2;
}
else {
  statement3;
}

This structure can accomodate more than 3 choices easily → just add an else if block for every possibility after the first if statement, and before the final else block.

PART B: Coin Toss

  1. Generate another random number at the top of the program, this time make it a random double between 0–1. Store it in a variable called luck.
  2. In a nested if statement (inside one of your existing conditional blocks) test the value of luck as a “follow up” after printing the Magic 8 Ball message.
  3. If it is greater than or equal to 0.5, print the message "LUCKY! 🍀"

Review: nested if 

if ( condition ) {
  statement1;
  if ( condition ) {
    statement2;
  }
}