"SCJP 1.6版考題 074" 修訂間的差異
出自 陳富國維基館
(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...) |
|||
| 行 14： | 行 14： | ||
public Object clone(){/* make a copy */} | public Object clone(){/* make a copy */} | ||
} | } | ||
| − | + | ||
C. public class Session | C. public class Session | ||
implements Runnable, Cloneable { | implements Runnable, Cloneable { | ||
| 行 20： | 行 20： | ||
public Object clone() {/* make a copy */} | public Object clone() {/* make a copy */} | ||
} | } | ||
| − | + | ||
D. public abstract class Session | D. public abstract class Session | ||
implements Runnable, Cloneable { | implements Runnable, Cloneable { | ||
| 行 26： | 行 26： | ||
public Object clone(){/* make a copy */} | public Object clone(){/* make a copy */} | ||
} | } | ||
| − | + | ||
E. public class Session | E. public class Session | ||
implements Runnable, implements Cloneable { | implements Runnable, implements Cloneable { | ||
於 2013年3月30日 (六) 06:36 的最新修訂
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 */}
}
解答
Ans: C D
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)
| ||||||||||||||||||||
