Time to seeing code: 0 min Time to writing code: 10 min

We will be using W3Schools to learn Java.

Lesson One

Complete W3Schools starting at Java Syntax and through Java Variables, including the code challenge.

Paste all code challenges you complete into your lesson section on your doc tab.

Robot Code Observation

This is a constants file from our last year’s codebase. Does this look familiar to what you have seen in W3Schools?

Even at the highest level, robot code is still backboned by primitive data types and constants. Simple blocks make a complex building.

public static class SpindexerConstants {
    public static final int kSpindexerMotorId = 57;
}
 
public static class indexingConstants {
    public static final double forwardTime = 1.25;
    public static final double reverseTime = .05;
}
 
public static class FeederConstants {
    public static final int kFeederKickerMotorId = 56;
}
 
// All values subject to change, just placeholders for now
public static class PathfindConstants {
    public static final double xP = 0.0;
    public static final double xI = 0.0;
    public static final double xD = 0.0;
    public static final double yP = 0.0;
    public static final double yI = 0.0;
    public static final double yD = 0.0;
    public static final double rotP = 0.0;
    public static final double rotI = 0.0;
    public static final double rotD = 0.0;
}

About the Snippet

You can see that these are all constant values, or values that cannot change after you declare them. This comes from the final keyword that you learned about during the Java Variables section of W3Schools.

Don’t worry if you don’t know what all these variable names mean. We will learn more about what motor IDs and P, I, and D do in later lessons.