— Scott McNealy, Sun Microsystems Chairman, President and ceo

Here’s a new
Raccoon object!
Here’s its reference
variable ‘r’. 
Exercise

---

268
 
chapter 9
Five-Minute
Mystery
“Weʼve run the simulation four times, and the main moduleʼs temperature consistently 
drifts out of nominal towards cold”, Sarah said, exasperated. “We installed the new temp-bots last 
week. The readings on the radiator bots, designed to cool the living quarters, seem to be within 
spec, so weʼve focused our analysis on the heat retention bots, the bots that help to warm the quar-
ters.” Tom sighed, at first it had seemed that nano-technology was going to really put them ahead 
of schedule. Now, with only five weeks left until launch, some of the orbiterʼs key life support 
systems were still not passing the simulation gauntlet.
“What ratios are you simulating?”, Tom asked.
“Well if I see where youʼre going, we already thought of that”, Sarah replied. “Mis-
sion control will not sign off on critical systems if we run them out of spec. We are 
required to run the v3 radiator botʼs SimUnits in a 2:1 ratio with the v2 radiatorʼs 
SimUnits”, Sarah continued. “Overall, the ratio of retention bots to radiator bots is 
supposed to run 4:3.”
“Howʼs power consumption Sarah?”, Tom asked. Sarah paused, “Well thatʼs 
another thing, power consumption is running higher than anticipated. Weʼve got a team 
tracking that down too, but because the nanos are wireless itʼs been hard to isolate the power 
consumption of the radiators from the retention bots.” “Overall power consumption ratios”, Sarah 
continued, “are designed to run 3:2 with the radiators pulling more power from the wireless grid.”
“OK Sarah”, Tom said “Letʼs take a look at some of the simulation initiation code.
Weʼve got to find this problem, and find it quick!” 
import java.util.*;
class V2Radiator {
V2Radiator(ArrayList list) {
for(int x=0; x<5; x++) { 
list.add(new SimUnit(“V2Radiator”));
}
}
}
class V3Radiator extends V2Radiator {
V3Radiator(ArrayList lglist) {
super(lglist);
for(int g=0; g<10; g++) { 
lglist.add(new SimUnit(“V3Radiator”));
}
}
}
class RetentionBot {
RetentionBot(ArrayList rlist) {
rlist.add(new SimUnit(“Retention”)); 
}
}