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Java Java Objects Harnessing the Power of Objects Overload Methods

Danny Low
Danny Low
550 Points
Posted by Danny Low
Danny Low
550 Points

Method overloading

In the GoKart quiz I have been trying to follow the PEZ examples. I understand I am trying to pass one method to another but I still get Task 1 error. Any simplified help appreciated.

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

  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 numberOfLaps) {
    while (numberOflaps > 0 ){
    lapsDriven += numberOfLaps;
    barCount -= numberOfLaps;
    }

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

2 Answers

Charlie Gallentine
Charlie Gallentine
12,092 Points
Charlie Gallentine
Charlie Gallentine
12,092 Points

In your code, the 'while' loop is unnecessary to complete the challenge, the drive method is meant to be called once and increment or decrement by the passed in number of laps:

public void drive(int numberOfLaps) {
   lapsDriven += numberOfLaps;
   barCount -= numberOfLaps;
}

The drive method you have next, which passes 1 for a default is then correct, however, it looks like your curly braces don't line up and that you are grouping both drive methods into a single larger method. This is probably the bigger issue as it is more syntax heavy: 

public void drive(int numberOfLaps) {
    while (numberOflaps > 0 ){
    lapsDriven += numberOfLaps;
    barCount -= numberOfLaps;
    }

  public void drive() {
      drive(1);
    } 
  } //This currently matches the first curly brace after "(int numberOfLaps)"

To complete the challenge, and to properly use method signatures for different functions, the methods need to be two separate methods with the same name and different parameters:

public void drive(int numberOfLaps) {
    lapsDriven += numberOfLaps;
    barCount -= numberOfLaps;
}

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

The way your code was initially laid out, it would increment/decrement lapsDriven and barCount respectively by the passed parameter, then it would have gotten confused by the declaration of another method/declaration. This fix allows either to be called independently with regards to the method signature.

For future reference, on these coding challenges, a "task one is no longer passing" error usually is just a syntax error in whatever you're working on in the current task.

Danny Low
Danny Low
550 Points
Danny Low
Danny Low
550 Points

Thanks Charlie, that is really helpful and cheers for the tip on error codes will save me time in the future.