Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Objects (Retired) Harnessing the Power of Objects Methods and Constants

Posted by sarthak sethi
sarthak sethi
Courses Plus Student 518 Points

Help me with this challenge!

Question: These GoKarts have a single rechargeable battery that have a display of bars to measure its energy level. Each battery has a maximum of 8 bars.

For this task, let's add a constant field to the class that stores the maximum number of energy bars. Make sure the field cannot be changed and is accessible from the class, not just the instance. Use the naming convention we learned.

public class GoKart { public static final int MAX_B = 8; public final int mBattery; private String mColor;

public GoKart(String color) { mColor = color; }

public String getColor() { return mColor; }

public void battery() { mBattery = MAX_B; }

}

GoKart.java 
public class GoKart {
  public static final int MAX_B = 8;
public final int mBattery;
  private String mColor;

  public GoKart(String color) {
    mColor = color;
  }

  public String getColor() {
    return mColor;
  } 

  public void battery() {
    mBattery = MAX_B;
  }

}
Cristi Sturgill
Cristi Sturgill
Courses Plus Student 29,577 Points

This code worked for me:

public class GoKart { public static final int MAX_BARS = 8; private int mBarsCount; private String mColor;

public GoKart(String color) { mColor = color; mBarsCount = 0; }

public void load() { mBarsCount = MAX_BARS; }

public String getColor() { return mColor; } }

4 Answers

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

What issues are you getting with your code?

One thing that I've noticed. Should mBattery be declared as final? Try it without the final keyword - see if that helps.

sachin limbu
PLUS
sachin limbu
Courses Plus Student 547 Points
sachin limbu
sachin limbu
Courses Plus Student 547 Points

Change

private int mBattery;

and add inside the constructor mBattery = 0;

then should work

Jean Noel EYEBE
Jean Noel EYEBE
1,128 Points
Jean Noel EYEBE
Jean Noel EYEBE
1,128 Points

TRY THIS

public class GoKart { private String mColor; public static final int MAX_B = 8; private int mBarsCount;

public GoKart(String color) { mColor = color; mBarsCount = 0; } public void charge(){ mBarsCount = MAX_B; }

public String getColor() { return mColor; } }

Gift Nyamapfene
Gift Nyamapfene
5,409 Points
Gift Nyamapfene
Gift Nyamapfene
5,409 Points

public class GoKart { public static final int MAX_BARS = 8; public final int Battery; private String Color;

public GoKart(String color) { this.Color = color; }

public String getColor() { return Color; }

public void battery() { this.Battery = MAX_BARS; }

}