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SCJP 1.6版考題 085 - 修訂歷史
2026-04-13T14:07:42Z
本 Wiki 上此頁面的修訂歷史
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Ikk：新頁面: 11. class Animal{public String noise(){return "peep";}} 12. class Dog extends Animal{ 13. public String noise(){return "bark";} 14 } 15. class Cat extends Animal{ 16. public...
2013-03-30T06:05:47Z
<p>新頁面: 11. class Animal{public String noise(){return "peep";}} 12. class Dog extends Animal{ 13. public String noise(){return "bark";} 14 } 15. class Cat extends Animal{ 16. public...</p>
<p><b>新頁面</b></p><div> 11. class Animal{public String noise(){return "peep";}}<br />
12. class Dog extends Animal{<br />
13. public String noise(){return "bark";}<br />
14 }<br />
15. class Cat extends Animal{<br />
16. public String noise(){return "meow";}<br />
17. }<br />
...<br />
30. Animal animal = new Dog();<br />
31. Cat cat = (Cat)animal;<br />
32. System.out.println(cat.noise());<br />
<br />
<br />
What is the result?<br />
A. peep<br />
B. bark<br />
C. meow<br />
D. Compilation fails.<br />
E. An exception is thrown at runtime.<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: E </span><br />
<br />
<span style="font-size:medium;"> 解說:<br />
animal 是指向Dog物件，<br />
Cat類別與Dog類別二者間無繼承關係，不可以指向animal 所指向的Dog物件<br />
<br />
</span> <br />
</div></div><br />
{{SCJP 1.6版考題講解}}</div>
Ikk