多项选择题
Which of the following statements about variables and their scopes are true？ （）
A. Instance variables are member variables of a class.
B. Instance variables are declared with the static keyword.
C. Local variables defined inside a method are created when the method is executed.
D. Local variables must be initialized before they are used.
相关考题
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单项选择题
Given the uncompleted code of a class： class Person { String name， department； int age； public Person（String n）{ name = n； } public Person（String n， int a）{ name = n； age = a； } public Person（String n， String d， int a） { // doing the same as two arguments version of constructor // including assignment name=n，age=a department = d； } } Which expression can be added at the "doing the same as..." part of the constructor？（）
A. Person（n，a）；
B. this（Person（n，a））；
C. this（n，a）；
D. this（name，age）； -
单项选择题
Whichofthefollowingassignmentisnotcorrect？（）
A. float f = 11.1；
B. double d = 5.3E12；
C. double d = 3.14159；
D. double d = 3.14；. -
单项选择题
Whichstatementsaboutthegarbagecollectionaretrue？（）
A. The program developer must create a thread to be responsible for free the memory.
B. The garbage collection will check for and free memory no longer needed.
C. The garbage collection allow the program developer to explicity and immediately free the memory.
D. The garbage collection can free the memory used java object at expect time.
