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AP Computer Science A· difficulty 3/5

public class Box {
    private int width;
    public Box(int width) {
        width = width;
    }
}

What is wrong with the constructor?

A
$Nothing is wrong$
B
$private fields cannot be set in a constructor$
C
$The parameter shadows the field; assignment has no effect on the field$
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D
$Constructors cannot have parameters$

Explanation

The parameter width shadows the instance field of the same name. The assignment width = width copies the parameter to itself; it should be this.width = width.

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