Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trialJeremy Nash
Courses Plus Student 2,250 PointsIncrements and Decrements Im absolutely lost
Okay, so let's use our new isFullyCharged helper method to change our implementation details of the charge method. Let's make it so it will only charge until the battery reports being fully charged. Let's use the ! symbol and a while loop. Inside the loop increment mBarsCount
public class GoKart {
public static final int MAX_ENERGY_BARS = 8;
private String mColor;
private int mBarsCount;
public GoKart(String color) {
mColor = color;
mBarsCount = 0;
}
public String getColor() {
return mColor;
}
public void charge() {
mBarsCount = MAX_ENERGY_BARS;
}
public boolean isBatteryEmpty() {
return mBarsCount == 0;
}
public boolean isFullyCharged() {
return mBarsCount == MAX_ENERGY_BARS;
}
}
3 Answers
Dennis Mårtensson
7,400 PointsIt's asking you to rewrite the charge()-method so it will increment 'mBarsCount' variable one step at a time until it is fully charged. Like this;
public void charge() {
while (!isFullyCharged()){
mBarsCount++;
}
}
So, while the battery is NOT (hence the ! symbol) fully charged, increment (as in, add 1 to the existing value of) 'mBarsCount', then check again if it is fully charged. Repeat until '(!isFullyCharged())' returns false (as in, it is fully charged).
Lindsay Sauer
12,029 PointsWe're wanting to keep checking to see if the battery's been charged yet, so you want to continuously check the value returned by isFullyCharged() until you receive true and the battery is charged. If it's not charged, it asks us to increment the value of mBarsCount:
while (!isFullyCharged()) {
mBarsCount++;
}
Jeremy Nash
Courses Plus Student 2,250 Pointsthanks to both of you gave me some clarity on what was asked and hopefully wont have the same problem later on
Dennis Mårtensson
7,400 PointsGlad to help!