L01 - Visual Studio Code (VS Code) Lab

1. Install Visual Studio Code from FIRST, you will need their version with WPILib. Link
2. In this exercise, we'll use an IDE to enter and execute a Java program. Start and the following window will appear:
3. Select the File > Open and either open a folder to use as the workspace or create a new one
4. Create a new file File > New File
5. Save the file as Test.java
6. Add the following code to start your program.

   public class Test {
   }
   

7. Add these standard comment lines at the start of the Class (use your name and the current date), this goes above line 1:

   /**
    * Print the Answer to Life, the Universe, Everything. 
    * @author Enter your name
    * @version Enter today's date 
    */ 
   

8. Enter the following code starting inside your class.

   public class Test {
     static int answer1 = 0;
     static int answer2;
     static int theAnswer;
     public static void main(String[] args) {
       answer1 = 20;
       answer2 = 2 * answer1;
       theAnswer = answer2 + 2;
       System.out.println("The answer is...");
       System.out.println(theAnswer);
     } 
   }
   

9. To run the program, press run above the main method. The output should be:

   The answer is....42
   

10. Create a new file named ComputeCA.
11. Create a class in the file named the same as the file name. It always has to be the same. Your class and file name should ALWAYS start with a capital letter.
12. Change the class description to Computes the circumference and area of a circle.
13. Change the author and the version by entering your name and today's date, respectively.
14. Enter the signature for the main method, this signature is:

    public static void main(String[] args){
    }
    

15. Declare a variable named radius of type double that has a value of 4.5.
16. Declare another variable named circumference of type double that has the value of 2π × radius. Use 22.0/7.0 for the value of π.
17. Declare a third variable named area of type double that has the value of π × radius². To easily compute the radius², multiply the radius by itself.
18. Display the value of the circumference.
19. Display the value of the area.

    Circumference: 28.285714285714285
    Area: 63.64285714285714
    

Java API Documentation

If you have enough screen real estate, open your browser and visit http://java.oracle.com then follow the link to the API documentation. Having the API window always available speeds up the development process.