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# i am confused by if/while

GoKart.java
public class GoKart {
public static final int MAX_ENERGY_BARS = 8;
private String mColor;
private int mBarsCount;

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

public String getColor() {
return mColor;
}

public void charge() {
if (!isFullyCharged()){
mBarsCount++;
}while()
mBarsCount = MAX_ENERGY_BARS;
return isFullyCharged;
}

public boolean isBatteryEmpty() {
return mBarsCount == 0;
}

public boolean isFullyCharged() {
return mBarsCount == MAX_ENERGY_BARS;
}

}

Hi Stas,

• Since the charge() method is void, you don't want to return anything from it.
• Per the instructions, you need the negation operator (!) and a while loop.
• Since you're checking if the current bar count is full: you need to check if the value of mBarsCount is equal to the value of MAX_ENERGY_BARS. Consider what those two variables represent: the bar count, and the maximum energy bars.
• Since the bar count isn't full, you need to make it full. This doesn't involve returning any value; rather, it involves changing the value of a variable (the mBarCount variable.)

Example code if you're still stuck:

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

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

public String getColor() {
return mColor;
}

public void charge() {
if (!isFullyCharged()){
mBarsCount++;
} while (!(mBarsCount == MAX_ENERGY_BARS))
mBarsCount = MAX_ENERGY_BARS;
}

public boolean isBatteryEmpty() {
return mBarsCount == 0;
}

public boolean isFullyCharged() {
return mBarsCount == MAX_ENERGY_BARS;
}
}
STAFF

Hmmm...

There is not an if/while block, maybe it's being confused with the do while code block?

Your code is so close Stas, don't feel to discouraged! Stick with it!

Try replacing your if with a while. Remember that isFullyCharged() is already doing that == check for you.

You got this!

Thank you, Craig! I've done like CJ said and it works for me) your tutorials are increddible)!