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 trialRyan White
8,160 PointsModify the drive method to define a parameter of how many laps should be driven. Cant figure out what's wrong?
I've run into an issue trying to use short hand as seen below to modify laps driven. Help please.
class GoKart {
public static final int MAX_BARS = 8;
private String color;
private int barCount;
private int lapsDriven;
private int laps;
public GoKart(String color) {
this.color = color;
}
public String getColor() {
return color;
}
public void charge() {
barCount = MAX_BARS;
}
public boolean isBatteryEmpty() {
return barCount == 0;
}
public boolean isFullyCharged() {
return MAX_BARS == barCount;
}
public void drive(int laps) {
lapsDriven+=;
barCount-=;
}
}
1 Answer
Brennen Green
923 PointsHi, you made a very simple mistake, when using shorthand you need to add what will be added to the variable.
Here is an example of proper shorthand
public void drive(int laps) {
lapsDriven += laps; //Takes the lapsDriven variable and adds the parameter passed with the method to the value
barCount -= laps; //Takes the barCount variable and subtracts the parameter passed with the method to the value
}
Only when incrementing do you just write out the variable then the two operators
variable++; //Takes the value of the increment and increments it by one
variable--; //Takes the value of the variable and decrements it by one