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Java Java Objects (Retired) Harnessing the Power of Objects Method Signatures

Terrence Adderley
PLUS
Terrence Adderley
Courses Plus Student 775 Points
Posted by Terrence Adderley
Terrence Adderley
Courses Plus Student 775 Points

HELP !

I believe I have all the parameters set up correctly just might have some wording incorrect.

GoKart.java 
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 charge() {
    while (!isFullyCharged()) {
      mBarsCount++;
    }
  }

  public boolean isBatteryEmpty() {
    return mBarsCount == 0;
  }

  public boolean isFullyCharged() {
    return mBarsCount == MAX_BARS;
  }

}

3 Answers

Steve Hunter
Steve Hunter
57,712 Points

Hi Terrence,

Here, you need to create a new drive method that uses the existing one.

The method needs to do take one lap from the Kart's ability. The existing drive method has an integer passed to it to determine what is deducted from the Kart's ability. What we need now is the ability to quickly reduce that by one.

So:

public void drive() {
  drive(1);
}

I hope that makes sense!

Steve.

Michael Hess
Michael Hess
24,512 Points
Michael Hess
Michael Hess
24,512 Points

Hello Terrence,

The challenge is asking you to create another drive method, that doesn't return anything ( a void method), to decrease the carts capability to complete a lap by 1 lap.

Try this:

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() {
    // Calls existing drive method to decrease carts lap capability by 1 lap
   drive(1);
  }
  public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    mBarsCount -= laps;
  }

  public void charge() {
    while (!isFullyCharged()) {
      mBarsCount++;
    }
  }

  public boolean isBatteryEmpty() {
    return mBarsCount == 0;
  }

  public boolean isFullyCharged() {
    return mBarsCount == MAX_BARS;
  }


}

Hope this helps!

Damien Watson
Damien Watson
27,419 Points
Damien Watson
Damien Watson
27,419 Points

Hi Terrence,

The challenge is asking you to create a new 'drive' method that takes no parameters but performs 1 lap.

Remember that you can have multiple methods with the same name but different arguments. This means you can create a new method without arguments that calls a method with arguments, saving you writing more code.

function drive() {
  drive(1);
}