Classes & Objects

Everything in the FTC SDK is built using classes and objects.

A class is a blueprint.

An object is an instance of that blueprint.

Creating a Class

public class Robot {

}

Fields

Fields store information about an object.

public class Robot {

    String name;
    int motors;

}

Constructors

A constructor initializes an object.

public class Robot {

    String name;

    public Robot(String name) {
        this.name = name;
    }

}

Create an object:

Robot robot = new Robot("Don't Blink");

Methods

Classes can contain methods.

public class Robot {

    public void drive() {
        System.out.println("Driving");
    }

}

Call the method:

robot.drive();

Access Modifiers

Use private unless something needs to be accessed from outside the class.

FTC Example

Subsystems are classes.

public class Intake {

    public void start() {

    }

    public void stop() {

    }

}

Then use them:

Intake intake = new Intake();
intake.start();

Key Takeaways

• Classes define objects.
• Objects store data and behavior.
• Constructors initialize objects.
• Fields store information.
• Methods perform actions.