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

Posted by Jonathan Cooper
Jonathan Cooper
11,938 Points

I don't know what to do.

I don't know what code is supposed to go where

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;
  }

}

1 Answer

Steve Hunter
Steve Hunter
57,712 Points

Hi Jonathan,

The challenge needs you to create a new drive method that has a different signature to the existing one. This new method will take no parameters (unlike the current one) and will just drive one lap. You currently have this code to make the GoKart drive:

  public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    mBarsCount -= laps;
  }

This has lots of code hidden so we don't want to duplicate all that. You want a new method that just drives one lap. We can use the existing code to do this:

  public void drive() {
    // Don't reinvent the wheel - use the existing method!
    drive(1);
  }

I hope that helps.

Steve.