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Java Java Objects Harnessing the Power of Objects Overload Methods

java objects

Challenge Task 1 of 2

Some users of our GoKart class wrote and asked that our drive method accept a parameter to specify how many laps to go, instead of just one. It happens, well hey at least you can practice your addition and subtraction shortcuts.

Modify the drive method to define a parameter of how many laps should be driven. Update the method body to handle the new parameter.

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() {
    lapsDriven++;
    barCount--;
  }
}

6 Answers

My apologies I made an error in the fist code I posted the one I posted 2nd is the correct one.

  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 lapsRemaining) {

    lapsDriven += lapsRemaining;
    barCount -= lapsRemaining;
  }
}

public class GoKart { public static final int MAX_BARS= 8; private String mColor; 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() { lapsDriven++; barCount--; } }

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

//For question 2 you need to have the following:

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 laps) {

lapsDriven+= laps;
barCount-= laps;

}

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

}

Thnx

best answer

Emin Seçkin
Emin Seçkin
2,949 Points

public void drive(int lapsRemaining) {

lapsDriven += lapsRemaining;
barCount -= lapsRemaining;

}

I still can't understand in drive method why lapsDriven is equal to lapsDriven + lapsRemaining.