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单项选择题 public class Mycircle {  public double radius;  public double diameter;  public void setRadius(double radius)  this.radius = radius;  this.diameter= radius * 2;  }  public double getRadius()   {  return radius;  }  Which statement is true?()  

A、 The Mycircle class is fully encapsulated.

B、 The diameter of a given MyCircle is guaranteed to be twice its radius.

C、 Lines 6 and 7 should be in a synchronized block to ensure encapsulation.

D、 The radius of a MyCircle object can be set without affecting its diameter.

  • B
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