请教两道SCJP的模拟题

2003-09-24 10:48:39 122 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

如何通过SCJP考试（含真题分析和考点） SCJP认证全称为SUN 认证Java程序员，是Java认证系列中最基础的一门认证。要通过Java的其他认证，必须先通过SCJP认证（SCEA认证除外）。即使SUN被Oracle收购了，Java技术本身是不会因为收购而受到影响，Java技术仍然是大型企业应用的首选技术。虽然不能说，如果拥有了Java的相关认证，就能有多高多高薪水，不过很多公司企业对于拥有证书阅读详情

是104或者147里的。题目如下：
1．
Given:
1. public class SyncTest {
2. private int x;
3. private int y;
4. public synchronized void setX (int i) (x=1;)
5. public synchronized void setY (int i) (y=1;)
6. public synchronized void setXY(int 1)(set X(i); setY(i);)
7. public synchronized Boolean check() (return x !=y;)
8. )
Under which conditions will check () return true when called from a different class?
A. Check() can never return true.
B. Check() can return true when setXY is called by multiple threads.
C. Check() can return true when multiple threads call setX and setY separately.
D. Check() can only return true if SyncTest is changed to allow x and y to be set separately.

Answer: A
这道题，我觉得A也不对。答案却是A，为什么？是不是答案错了？高手帮忙解释一下！

2.
which two are true to describe an entire encapsulation class?
A. member data have no access modifiers
B. member data can be modified directly
C. the access modifier for methods is protected
D. the access modifier to member data is private
E. methods provide for access and modification of data

Answer: d,e
我觉得D不应该对，成员变量不能没有途径访问吧。还是

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