Ikk 於 2013年3月30日 (六) 06:36

2013-03-30T06:36:51Z

Ikk：新頁面: Which two classes correctly implement both the java.lang.Runnable and the java.lang.Cloneable interfaces? (Choose two.) A. public class Session implements Runnable, clon...

2013-03-30T06:36:20Z

新頁面: Which two classes correctly implement both the java.lang.Runnable and the java.lang.Cloneable interfaces? (Choose two.) A. public class Session implements Runnable, clon...

新頁面

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 */}
}

<div class="toccolours mw-collapsible mw-collapsed">
<span style="font-size:medium;">解答</span>

----
<div class="mw-collapsible-content">
<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)
</span>
</div></div>
{{SCJP 1.6版考題講解}}

@@ 行 14： / 行 14： @@
              public Object clone(){/* make a copy */}
+     }
-−
      C. public class Session
         implements Runnable, Cloneable {
@@ 行 20： / 行 20： @@
              public Object clone() {/* make a copy */}
+     }
-−
      D. public abstract class Session
         implements Runnable, Cloneable {
@@ 行 26： / 行 26： @@
              public Object clone(){/* make a copy */}
+     }
-−
      E. public class Session
         implements Runnable, implements Cloneable {

SCJP 1.6版考題 074 - 修訂歷史

Ikk 於 2013年3月30日 (六) 06:36

Ikk：新頁面: Which two classes correctly implement both the java.lang.Runnable and the java.lang.Cloneable interfaces? (Choose two.) A. public class Session implements Runnable, clon...