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Java Java Objects Harnessing the Power of Objects Computed Properties

Posted by Ryan Croak
Ryan Croak
4,884 Points

Can you help me I don't understand what to do here I watched the video and it didn't help me

java Objects

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

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

  public String getColor() {
    return color;
  }

  public void charge() {
    barCount = MAX_BARS;
  }
}

3 Answers

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

Hi Ryan,

The first task requires you to write a public method that returns a boolean which is called isBatteryEmpty. It takes no parameters, so leave the parentheses empty but be sure to include them.

Inside the method, compare barCount to zero using == and return the result of that comparison.

Let me know how you get on.

Steve.

Ryan Croak
Ryan Croak
4,884 Points
Ryan Croak
Ryan Croak
4,884 Points

Ok, thank you guys for the help i'll see if I can figure it out.

Steve Hunter
Steve Hunter
57,712 Points

Let me know how you get on.

Steve.

Karel Schwab
Karel Schwab
12,955 Points
Karel Schwab
Karel Schwab
12,955 Points

Hey Ryan. This is one example of how you can solve it:

Firstly, you would create a public method that returns a boolean and is named isBatteryEmpty: public boolean isBatteryEmpty() {};

Then you would create a boolean variable inside the created method and initialize it to false: boolean isEmpty = false;

Use an if statement to determine if the barCount is equal to 0: if(barCount == 0){isEmpty = true;}

Lastly, return the variable you created in the method: return isEmpty;

Steve Hunter
Steve Hunter
57,712 Points

Or you could just return barCount == 0; - that expression evaluates to a true or false outcome, so there's no need to use an if conditional. Just return the result of the comparison.

If you find yourself writing code such as this (and this is just an example for illustrative purposes): 

public boolean methodName(){
  if(binaryCondition){
    return true;
  }else{
    return false;
  }
}

you can just use:

public boolean methodName(){
  return binaryCondition;
}

as long as binaryCondition can only be true or false, such as a comparison to a number. In this example, the variable barCount is either equal to zero or it isn't; there's no edge case so its equality-comparison to zero can only evaluate to true or false, negating the need for an if conditional.

Steve.