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Java Java Objects Harnessing the Power of Objects Overload Methods

Varun Singh
Varun Singh
1,905 Points

Create a new method named drive that accepts no arguments. It should call the newer drive method passing in a 1 for the

I could not understand why we are passing 1 by calling old one in the new drive method with no argument ?

class GoKart { public static final int MAX_BARS = 8; private String color; private int barCount; private int laps;

bpublic 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 lapsDriven) { laps += lapsDriven; barCount -= lapsDriven;

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

}

GoKart.java
class GoKart {
  public static final int MAX_BARS = 8;
  private String color;
  private int barCount;
  private int laps;


   bpublic 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 lapsDriven) {
    laps += lapsDriven;
    barCount -= lapsDriven;

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

}

2 Answers

Ruud Claassen
Ruud Claassen
9,359 Points

The advantage of calling the drive(1) method inside this drive() method, is that you only have to provide the logic for this method once: inside of the drive method that takes an argument.

So now you can simply call the drive() method (without an argument) to make the kart drive a single lap.

drive();  // --> Make the kart drive a single lap

drive(int lapsDriven); // --> Make the kart drive a different (specific) number of laps

I could really use help on this question as well. The only answer is not correct.