Java Objects

Question

Please help me. The challenge is...

Add a public constructor to the GoKart.java class that allows the parameter color to be passed in. In the constructor store the argument color in the private color field.

I am not sure of what i need to write, but the code here is not what I wrote but what was already there

GoKart.java

public class GoKart {
  private String mColor = "red";

  public String getColor() {
    return mColor;
  }
}

Answer 1 · 2016-04-19T22:28:24Z

April 19, 2016 10:28pm

Hi Rodrigo,

A constructor is a method inside the class that takes the name of the class. You can define the parameters that it accepts when you write the code - in this case, it wants to receive the 'color' (a string) so it can create the instance of GoKart. A constructor is public (generally!) and returns nothing (except a newly created instance which isn't expressly written) and accepts whatever parameters that make sense. In this case, it wants a string. That string is then assigned to the mColor member variable inside the new instance of that GoKart - this means we need to remove the assignment of "red" to the member variable - we can now assign anything we choose in there.

This all looks like:

public class GoKart {
  private String mColor; // remove the assignment here

  public String getColor() {
    return mColor;
  }
// OUR CODE HERE
  public GoKart(String color){  // passes in a string called color inside the method
    mColor = color; // assign color to mColor for the instance of GoKart
  }
}

I hope that helps.

Steve.

Answer 2 · 2016-04-19T22:30:56Z

April 19, 2016 10:30pm

Thanks a lot

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Rodrigo Alarcon

Rodrigo Alarcon

Java Objects

2 Answers

Steve Hunter

Steve Hunter

Rodrigo Alarcon

Rodrigo Alarcon

Rodrigo Alarcon

Rodrigo Alarcon

Steve Hunter

Steve Hunter