Basics

Every Java program is built from a few fundamental concepts.

Variables

Variables store information.

int score = 10;
String teamName = "Don't Blink";

You can change the value later.

score = 15;

Data Types

Every variable has a type.

int motors = 4;
double power = 0.75;
boolean intakeRunning = true;
String robotName = "Don't Blink";

Operators

Arithmetic operators perform math.

Assignment operators update variables.

Comparison operators compare values.

Logical operators combine conditions.

Printing

You can print information to the console.

System.out.println("Hello!");

In FTC, you'll usually use telemetry instead.

telemetry.addData("Power", power);
telemetry.update();

Comments

Comments explain your code.

Single-line comment:

// Drive forward

Multi-line comment:

/*
This code controls
the intake.
*/

Comments are ignored when your program runs.

Key Takeaways

• Variables store data.
• Every variable has a type.
• Operators perform calculations and comparisons.
• System.out.println() prints text.
• Comments help explain your code.