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Alexander Nowak
498 PointsMethod signatures
HI, I didn't really understand this video despite watching it a few times. I am also stuck on the challenge. Would really appreciate any help/guidance .
Thanks!
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(int laps) {
// Other driving code omitted for clarity purposes
mBarsCount -= laps;
}
public void drive() {
mBarsCount -= laps;
}
public void charge() {
while (!isFullyCharged()) {
mBarsCount++;
}
}
public boolean isBatteryEmpty() {
return mBarsCount == 0;
}
public boolean isFullyCharged() {
return mBarsCount == MAX_BARS;
}
}
6 Answers
Grigorij Schleifer
10,365 PointsHi Alexander,
a method signature helps you to distinguish methods from each other. The first drive method takes a int argument. You tell here how many laps do you want to drive. The second drive method takes no argument. This is the difference between this drive methods. They have different signatures.
And the challenge wants you to create a second drive method that takes no parameter (no arguments like your first drive method) so you can distinguish them. Inside the new methode you can use drive(int laps) method that take arguments. Try this:
public void drive(int laps) {
// Other driving code omitted for clarity purposes
mBarsCount -= laps;
}
public void drive() { //a new drive method without an argument inside the parenthesis ()
drive(1);//here you use your first drive method. And because this method needs an argument (int laps) how many laps to drive and the challenge wants only one lap, you put a 1 as an argument inside
}
Hope it helps
Grigorij
Alexander Nowak
498 PointsThanks that clears things up! What is a method? and what are they used for?
Thanks,
Alex
Grigorij Schleifer
10,365 PointsHi Alex,
you have a class. A class is like a blueprint that describes what objects of this class can do and what they know. So the methods do something an variables know something.
public class Dog{// a Dog class
String dogName = "Washington"; //in the class-blueprint Dog you have a String variable dogName. It knows the dog´s name - its Washington
void bark(){ // the class Dog have methods and this methods can do something. Therefore you declare a bark() method that does "Wuff Wuff".
//Remember that methods have a parenthesis at the end of methods name - bark()
System.out.println("Wuff Wuff");
}
}
I hope it helps
If not, let us know
Grigorij
Alexander Nowak
498 PointsThank you! That really cleared things up!
Alexander Nowak
498 PointsThank you! That really cleared things up!
Christiaan Quyn
14,706 PointsBeautifully Explained ! Thank you :)
Alexander Nowak
498 PointsOh! aha
I have changed it now :)
Grigorij Schleifer
10,365 PointsNo problem,
we both learn from our mistakes, like Craig said :)
See you in the forum, coding-bro !
Kyle Banyard
2,260 PointsThank you Grigorij I was stuck on that for forever!
Grigorij Schleifer
10,365 PointsYou are very welcome :)
Grigorij Schleifer
10,365 PointsYou are very welcome !
But you gave you the best answer
:):):)