Ikk：新頁面: 1. class Plant{ 2. private String name; 3. public Plant(String name){this.name = name;} 4. public String getName(){return name;} 5. } 6. public class Tree extends Plant{ 7...

2013-03-30T07:43:38Z

新頁面: 1. class Plant{ 2. private String name; 3. public Plant(String name){this.name = name;} 4. public String getName(){return name;} 5. } 6. public class Tree extends Plant{ 7...

新頁面

1. class Plant{
2. private String name;
3. public Plant(String name){this.name = name;}
4. public String getName(){return name;}
5. }
6. public class Tree extends Plant{
7. public void growFruit(){}
8. public void dropLeaves(){}
9. }

What statement is true?
A. The code will compile without changes.
B. The code will compile if public Tree(){Plant();} is added to the Tree class.
C. The code will compile if public Plant(){Tree();} is added to the Plant class.
D. The code will compile if public Plant(){this("fern");} is added to the Plant class.
E. The code will compile if public Plant(){Plant("fern");} is added to the Plant class.

<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: D </span>

<span style="font-size:medium;"> 解說:
Tree的預設建構子有super()，父類別必須有無參數的建構子

</span>
</div></div>
{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 043 - 修訂歷史

Ikk：新頁面: 1. class Plant{ 2. private String name; 3. public Plant(String name){this.name = name;} 4. public String getName(){return name;} 5. } 6. public class Tree extends Plant{ 7...