Conditionals

if statements

An if statement runs code only if a condition is true.

if (batteryVoltage > 12) {
    System.out.println("Ready!");
}

if-else

If the condition is false, the else block runs.

if (power > 0.5) {
    System.out.println("Fast");
} else {
    System.out.println("Slow");
}

else if

Check multiple conditions.

if (score >= 100) {
    System.out.println("Excellent");
} else if (score >= 80) {
    System.out.println("Good");
} else {
    System.out.println("Keep practicing");
}

switch

A switch statement is useful when checking one variable against several possible values.

switch (alliance) {
    case RED:
        System.out.println("Red Alliance");
        break;

    case BLUE:
        System.out.println("Blue Alliance");
        break;

    default:
        System.out.println("Unknown");
}

FTC Example

if (gamepad1.a) {
    intake.start();
} else {
    intake.stop();
}

Key Takeaways

Use if for decisions.
Use else for an alternative.
Use else if for multiple conditions.
Use switch when checking many possible values.