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SCJP 1.6版考題 086 - 修訂歷史
2026-04-24T03:06:20Z
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Ikk：新頁面: 10. abstract class A{ 11. abstract void a1(); 12. void a2(){} 13. } 14. class B extends A{ 15. void a1(){} 16. void a2(){} 17. } 18. class C extends B{void c1(){}} and:...
2013-03-30T06:04:32Z
<p>新頁面: 10. abstract class A{ 11. abstract void a1(); 12. void a2(){} 13. } 14. class B extends A{ 15. void a1(){} 16. void a2(){} 17. } 18. class C extends B{void c1(){}} and:...</p>
<p><b>新頁面</b></p><div> 10. abstract class A{<br />
11. abstract void a1();<br />
12. void a2(){}<br />
13. }<br />
14. class B extends A{<br />
15. void a1(){}<br />
16. void a2(){}<br />
17. }<br />
18. class C extends B{void c1(){}}<br />
and:<br />
A x = new B(); C y = new C(); A z = new C();<br />
<br />
<br />
What are four valid examples of polymorphic (需為多型) method calls?<br />
(Choose four.)<br />
A. x.a2();<br />
B. z.a2();<br />
C. z.c1();<br />
D. z.a1();<br />
E. y.c1();<br />
F. x.a1();<br />
<br />
<div class="toccolours mw-collapsible mw-collapsed"><br />
<span style="font-size:medium;">解答</span><br />
<br />
----<br />
<div class="mw-collapsible-content"><br />
<span style="font-size: medium;">Ans: A B D F </span><br />
<br />
<span style="font-size:medium;"> 解說:<br />
此題問那四個是有效的多形叫用<br />
C不行是因為若為多形，方法必須在父類別中宣告，在子類別覆載之，c1方法不是一個覆載的方法<br />
E不行也是因為c1非多形的叫用形式<br />
</span> <br />
</div></div><br />
{{SCJP 1.6版考題講解}}</div>
Ikk