Ikk：新頁面: 檔案:SCJP201-1 2.png Given: 1. import java.util.*; 2. class A{} 3. class B extends A{} 4. public class Test{ 5. public static void main(Strang[] args){ 6. List l...

2013-03-30T00:11:53Z

新頁面: 檔案:SCJP201-1 2.png Given: 1. import java.util.*; 2. class A{} 3. class B extends A{} 4. public class Test{ 5. public static void main(Strang[] args){ 6. List<A> l...

新頁面

[[檔案:SCJP201-1 2.png]]

Given:
1. import java.util.*;
2. class A{}
3. class B extends A{}
4. public class Test{
5. public static void main(Strang[] args){
6. List<A> listA = new LinkedList<A>();
7. List<B> listB = new LinkedList<B>();
8. List<Obect> listO = new LinkedList<Obect>();
9. //insert code here
10. }
11. public static void m1(List<? extends A> list){}
12. public static void m2(List<A> list){}

Place a result onto each method call to indicate
what would happen if the method call were inserted at line 9. Note: Results can be used more than once.

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<span style="font-size:medium;">解答</span>

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<span style="font-size: medium;">Ans:<BR>[[檔案:SCJP201-2.png]] </span>

<span style="font-size:medium;"> 解說:<BR>
m1限定代入的參數是內存類別A或其子類別的串列集合
m2限定代入內存類別A的串列集合
listA是內存類別A的集合
listB是內存類別B的集合
listO是內存類別O的集合

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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 201 - 修訂歷史

Ikk：新頁面: 檔案:SCJP201-1 2.png Given: 1. import java.util.*; 2. class A{} 3. class B extends A{} 4. public class Test{ 5. public static void main(Strang[] args){ 6. List l...