檢視 SCJP 1.6版考題 074 的原始碼

 Which two classes correctly implement
 both the java.lang.Runnable
 and the java.lang.Cloneable interfaces? (Choose two.)
  
   A. public class Session
      implements Runnable, cloneable {
            public void run();
            public Object clone();
    }
 
    B. public class Session
       extends Runnable, Cloneable {
            public void run(){/* do something */}
            public Object clone(){/* make a copy */}
    }
 
    C. public class Session
       implements Runnable, Cloneable {
            public void run(){/* do something */}
            public Object clone() {/* make a copy */}
    }
  
    D. public abstract class Session
       implements Runnable, Cloneable {
            public void run(){/* do something */}
            public Object clone(){/* make a copy */}
    }
 
    E. public class Session
       implements Runnable, implements Cloneable {
            public void run(){/* do something */}
            public Object clone() {/* make a copy */}
    } 
 
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<span style="font-size:medium;">解答</span>

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<span style="font-size: medium;">Ans: C D    </span>

<span style="font-size:medium;"> 解說:
 此題問那二個類別正確地實作Runnable與Cloneable介面
 A錯是因為既然實作了介面，就必須把介面中的抽象方法實作寫出來，run和clone方法依然是抽象的。
 B錯是類跑不能用extends去繼承介面
 E錯是寫法不對(要如C和D寫法)
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{{SCJP 1.6版考題講解}}