How to use objects in code

Preface – This post is part of the Object Oriented Thinking series.

“Many Bothans died to bring us this information.”

“The enemy battlestation is heavily shielded and carries a firepower greater than half the starfleet. Its defenses are designed around a direct large-scale assault. A small, one-man fighter should be able to penetrate the outer defense. The Empire doesn’t consider a small, one-man fighter to be any threat…”

“The target area is a small thermal exhaust port only two meters wide. Only a precise hit with a proton torpedo will start a chain reaction which should destroy the station.”

“May the Force be with you…”

**ALL PILOTS, MAN YOUR SHIPS!!**

User lukeSkywalker = [SELECT Id FROM User WHERE Title = 'Jedi'];

// Create Luke's X-Wing using the default constructor
XWing lukesXWing = new XWing();
// Use dot notation to manually set the attributes of the X-Wing
lukesXWing.pilot               = lukeSkywalker;
lukesXWing.protonTorpedoes     = 4;
lukesXWing.deathStarsDestroyed = 0;
lukesXWing.powerRemaining      = 1.00;
lukesXWing.shield              = new DeflectorShield();
lukesXWing.droid               = new AstromechDroid('R2-D2');
// Create a team of X-Wings to help with the battle!
List<XWing> redSquadron = new List<XWing>();
List<User> pilots = [SELECT Id FROM User WHERE Title = 'Pilot'];

for (User pilot : pilots) {
  // Use our custom constructor to quickly initiate new X-Wings
  XWing x = new XWing('Red ' + pilot.Id, pilot);
  redSquadron.add(x);
  System.debug(x.Name + ' standing by!');
}

**ENTERING HYPERSPACE**

// Use an X-Wing method and store its return value
Boolean isSuccess = lukesXWing.initiateHyperdrive();
if (isSuccess != true) {
  System.debug('I have a bad feeling about this...');
}

for (XWing x : redSquadron) {
  // You don't always have to use the return value!
  x.initiateHyperdrive();
}

**FIGHTERS ABOVE YOU, COMING IN!!**

**RED SIX IS UNDER HEAVY FIRE!!**

// Use dot notation to traverse relationships
redSquadron[5].shield.decreaseShields(0.50);
redSquadron[5].shield.decreaseShields(0.30);
System.debug('BAROOM!!');
redSquadron.remove(5);

**LOCK S-FOILS INTO ATTACK POSITION!!**

“Luke, trust your feelings.”

lukesXWing.shootLasers(2);
lukesXWing.shootLasers(4);
lukesXWing.shootLasers(10);
System.debug('ZREEEET!');

**THIS IS RED LEADER, WE’RE BEGINNING OUR ATTACK RUN!!**

“Several fighters have broken from the main group.”

“Come with me.”

**I CAN’T SHAKE HIM – I’M HIT BUT NOT BAD!!**

lukesXWing.shield.decreaseShields(0.40);

**R2, SEE WHAT YOU CAN DO ABOUT IT!!**

lukesXWing.repair();
System.debug(lukesXWing.shield.capacity);  // 1.00, baby!

**WE’RE ALMOST IN RANGE OF THE EXHAUST PORT!!**

**ALMOST THERE!!**

**ALMOST THERE!!**

**IT’S NO GOOD, WE CAN’T MANEUVER!!**

**THIS IS IT!!**

redSquadron.remove(0);
redSquadron.remove(3);
redSquadron.remove(2);
redSquadron.clear();

**RED SQUADRON HAS BEEN WIPED OUT!!**

**LUKE YOU’RE OUR ONLY HOPE!!**

“I’m on their leader.”

“Use the Force, Luke.”

“The Force is strong with this one.”

**LUKE YOUR TARGETING COMPUTER IS OFF!!**

**WHAT’S WRONG!!**

**NOTHING, I’M ALRIGHT!!**

“I have you now…”

“What?!”

**YEAHOO! YOU’RE ALL CLEAR KID!!**

**NOW LET’S BLOW THIS THING AND GO HOME!!**

lukesXWing.fireProtonTorpedo();

// Don't forget the test class!
System.assertEquals(1, lukesXWing.deathStarsDestroyed);

Next post: A practical example of using objects in code!