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Start your free trialJoe Steffy
3,012 PointsI'm stuck again. What am I missing?
I'm stuck again. What am I missing?
public class GoKart {
public static final int MAX_BARS = 8;
private String mColor;
private int mBarsCount;
public GoKart(String color) {
mColor = color;
mBarsCount = 0;
}
public String getColor() {
return mColor;
}
public void drive() {
drive(MAX_BARS);
}
public void drive(int laps) {
mBarsCount -= laps;
drive(1);
}
public void charge() {
while (!isFullyCharged()) {
mBarsCount++;
}
}
public boolean isBatteryEmpty() {
return mBarsCount == 0;
}
public boolean isFullyCharged() {
return mBarsCount == MAX_BARS;
}
}
2 Answers
Gergő Bogdán
6,664 PointsHi,
Not sure what is your issue, but this code:
public void drive() {
drive(MAX_BARS);
}
public void drive(int laps) {
mBarsCount -= laps;
drive(1);
}
can cause stack overflow, because you are recursively invoking the drive(1) method and you don't have a stop condition. So if you invoke drive()
, whicl will invoke drive(8)
, then mBarsCount -= 8
will be executed and the drive(1)
method is invoked AGAIN, it enters in drive(int laps)
method, executes mBarsCount -= 1
at this moment mBarsCount
has value -9 AND invokes drive(1)
AGAIN and in the next step you will have mBarsCount
value -10 and so on.
I don't know exactly what you want to implement, but I suppose you need to stop, lets say when the mBarsCount
will be less or equal to 0 (mBarsCount <= 0
):
public void drive(int laps) {
mBarsCount -= laps;
if (mBarsCount <= 0) {
return;
} else {
drive(1);
}
}
Craig Dennis
Treehouse TeacherHINT: Using method signatures, add a new default method called drive that performs just 1 lap and takes no arguments.
Highlighting mine!