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Java Java Objects Harnessing the Power of Objects Throwing Exceptions

Andrei Musat
Andrei Musat
738 Points

Make sure you throw a new IllegalArgumentException if the requested amount of laps would make the battery less than zer

I got stuck here ,can someone clear my mind I tried many ways but couldn´t go forward...

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() {
    drive(1);
  }

  public void drive(int laps) {
   int totalLapsToGo=barCount-=laps;

    if (barCount>totalLapsToGo){
     throw new IllegalArgumentException ("Sorry, too many laps."); 
    }
     lapsDriven += laps;
   barCount -= laps;
  }
}
Andrei Musat
Andrei Musat
738 Points

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() { drive(1); }

public void drive(int laps) { lapsDriven += laps; barCount -= laps; int maxLaps= lapsDriven+=laps; /I also tried with lapsDriven-=laps; I´ve got the same error message/ if(maxLaps>MAX_BARS){ throw new IllegalArgumentException("Too many laps requested"); } barCount=maxLaps; } }

1 Answer

Chris Jones
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Chris Jones
Java Web Development Techdegree Graduate 23,933 Points

Hey Andrei,

Good try, but there's no need for the totalLapsToGo variable. You just need to test if the laps parameter is greater than the barCount field. So, all you need is:

public void drive(int laps) {
    if (barCount < laps) {
        throw new IllegalArgumentException(); 
    } else {
        lapsDriven += laps;
        barCount -= laps;
    }
  }

I hope that helps! Let me know if you have any more questions!

Andrei Musat
Andrei Musat
738 Points

Thank you for the help !