OCJP(310-065)多项选择题每日一练(2019.10.14)

A.declare reset（） using the synchronized keyword
B.declare getName（） using the synchronized keyword
C.declare getCount（） using the synchronized keyword
D.declare the constructor using the synchronized keyword
E.declare increment（） using the synchronized keyword

A.The hashCode method for a given class can be used to test for object equality and object inequality for that class.
B.The hashCode method is used by the java.util.SortedSet collection class to order the elements within that set.
C.The hashCode method for a given class can be used to test for object inequality， but NOT objecte quality， for that class.
D.The only important characteristic of the values returned by a hashCode method is that the distribution of values must follow a Gaussian distribution.
E.The hashCode method is used by the java.util.HashSet collection class to group the elements within that set into hash buckets for swift retrieval.

A.new Thread（） {public void run（） { doStuff（）； }}；
B.new Thread（） {public void start（） { doStuff（）； }}；
C.new Thread（） {public void start（） { doStuff（）； }}.run（）；
D.new Thread（） {public void run（） { doStuff（）； }}.start（）；
E.new Thread（new Runnable（） {public void run（） { doStuff（）； }}）.start（）；

A.When using versions of Java technology earlier than 5.0.
B.When sharing a StringBuffer among multiple threads.
C.When using the java.io class StringBufferInputStream.
D.When you plan to reuse the StringBuffer to build more than one string.

A.Change line 2 to：public int a；
B.Change line 2 to：protected int a；
C.Change line 13 to：public Sub（） { this（5）； }
D.Change line 13 to：public Sub（） { super（5）； }