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分享大家来看几道题目
请大家给出下面题目的答案与分析,谢谢
1. Which would be the most suitable for storing data elements that must not appear in the store more than once, if searching is not a priority?
A. java.util.Collection
B. java.util.List
C. java.util.Set
D. java.util.Map
E. java.util.Vector
F. java.util.HashSet
2. Which one of the following statements is true? (choose all that apply)
A. Transient methods may not be overridden.
B. Transient classes may not be serialized.
C. Transient variables must be static.
D. Transient variables are not serialized.
3. Which of the following are true. (choose all that apply)
a String is not thread-safe
b StringBuffer should be used when localization is required
c String is immutable while StringBuffer is not.
d StringBuffer is the buffer for String.
e String and stringBuffer are identical.
4. How many threads can potentially access one servlet instance
a always only one
b multiple
c exactly two: one created by the JVM another by the servlet container
d zero
e wrong question.
1. Which would be the most suitable for storing data elements that must not appear in the store more than once, if searching is not a priority?
A. java.util.Collection
B. java.util.List
C. java.util.Set
D. java.util.Map
E. java.util.Vector
F. java.util.HashSet
2. Which one of the following statements is true? (choose all that apply)
A. Transient methods may not be overridden.
B. Transient classes may not be serialized.
C. Transient variables must be static.
D. Transient variables are not serialized.
3. Which of the following are true. (choose all that apply)
a String is not thread-safe
b StringBuffer should be used when localization is required
c String is immutable while StringBuffer is not.
d StringBuffer is the buffer for String.
e String and stringBuffer are identical.
4. How many threads can potentially access one servlet instance
a always only one
b multiple
c exactly two: one created by the JVM another by the servlet container
d zero
e wrong question.
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