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單項(xiàng)選擇題

下列代碼正確的是哪項(xiàng)?() 

A. public class Session implements Runnable, Clonable{   public void run ();public Object clone () ; }
B. public class Session extends Runnable, Cloneable {  public void run() {/*dosomething*/}       public Object clone() {/*make a copy*/} }
C. public abstract class Session implements Runnable, Clonable {       public void run() {/*do something*/}       public Object clone() {/*make a copy*/}        }
D. public class Session implements Runnable, implements Clonable {       public void run() {/*do something*/}       public Object clone() {/*make a copy*/}       }

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