多选题Given the following code， which statements concerning the objects referenced through the member variables i， j and k are true， given that any thread may call the methods a， b and c at any time？ （）  class Counter {  int v = 0；   synchronized void inc（） 

题目
多选题
Given the following code， which statements concerning the objects referenced through the member variables i， j and k are true， given that any thread may call the methods a， b and c at any time？ （）  class Counter {  int v = 0；   synchronized void inc（） { v++； }   synchronized void dec（） { v--； }   }   public class Q7ed5 {   Counter i；   Counter j；   Counter k；   public synchronized void a（） {   i.inc（）；   System.out.println（"a"）；   i.dec（）；  }   public synchronized void b（） {   i.inc（）；  j.inc（）；  k.inc（）；   System.out.println（"b"）；  i.dec（）；  j.dec（）； k.dec（）；  }   public void c（） {   k.inc（）；   System.out.println（"c"）；   k.dec（）；   }   }
A

i.v is guaranteed always to be 0 or 1.

B

j.v is guaranteed always to be 0 or 1.

C

k.v is guaranteed always to be 0 or 1

D

j.v will always be greater than or equal to k.v at any give time.

E

k.v will always be greater than or equal to j.v at any give time.

相似考题

1.All the following statements concerning the nature of language change is true except()A language change is inevitableB language change is abruptC language change is universalD language change is extensive

2.In HDLC Protocol, when Supervisory Frame's type code is '00'.About the following statements, which is correct.A．Receive ReadyB．Receive not ReadyC．RejectD．Selective Reject

3.Which statements concerning the switch construct are true？（）  A、All switch statements must have a default label.B、There must be exactly one label for each code segment in a switch statement.C、The keyword continue can never occur within the body of a switch statement.D、No case label may follow a default label within a single switch statement.E、A character literal can be used as a value for a case label.

4.Click the Exhibit button. Given:Which two statements are true if a NullPointerException is thrown on line 3 of class C? ()A.The application will crash.B.The code on line 29 will be executed.C.The code on line 5 of class A will execute.D.The code on line 5 of class B will execute.E.The exception will be propagated back to line 27.

更多“Given the following code， which statements concerning the ob”相关问题

  • 第1题：

    Which of the following statements concerning intellectual property is wrong？（）

    • A、Intellectual property is an intangible creation
    • B、Intellectual property in ludes patents，trademarks，copyrights，etc.
    • C、Intellectual property is a visible creation
    • D、There are some agreement sconcerning intellectual property under the WTO

    正确答案:C

  • 第2题：

    Given the following code fragment：     public void create（） {     Vector myVect；     myVect = new Vector（）；      }  Which of the following statements are true？（） 

    • A、 The declaration on line 2 does not allocate memory space for the variable myVect.
    • B、 The declaration on line 2 allocates memory space for a reference to a Vector object.
    • C、 The statement on line 2 creates an object of class Vector.
    • D、 The statement on line 3 creates an object of class Vector.
    • E、 The statement on line 3 allocates memory space for an object of class Vector.

    正确答案:A,D,E

  • 第3题：

    多选题
    Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)
    A

    c=d

    B

    l and k are parallel

    C

    m and l are perpendicular


    正确答案： C,B
    解析：
    根据题目中的已知信息无法推断出各直线的关系，因此B、C均不正确；而由图示可知，c和d分别是a和b的补角，由于a=b，所以c=d，A项正确。

  • 第4题：

    单选题
    Which of the following statements concerning cargo is correct?（）
    A

    Cargoes are any type of goods transported by any type of ships

    B

    Cargoes are goods transported in bulk

    C

    Cargoes usually include goods transported in bulk and in containers

    D

    Cargoes are usually packaged in containers


    正确答案： D
    解析： 暂无解析

  • 第5题：

    单选题
    Which of the following statements concerning butterfly valves is correct?（）
    A

    Special tools are required for lapping or grinding

    B

    It is impossible to throttle flow with a butterfly valve

    C

    To close the valve, it is only necessary to turn the handle a quarter of a turn

    D

    The butterfly valve should never be used in a freshwater system


    正确答案： C
    解析： 暂无解析

  • 第6题：

    多选题
    Given the following class， which statements can be inserted at position 1 without causing the code to fail compilation？（）   public class Q6db8 {   int a；   int b = 0；   static int c；   public void m（） {   int d；   int e = 0；   // Position 1   }   }
    A

    a++；

    B

    b++；

    C

    c++；

    D

    d++；

    E

    e++；


    正确答案： A,D
    解析： 暂无解析

  • 第7题：

    单选题
    Which of the following statements is true concerning centrifugal pumps?（）
    A

    They are particularly suited for pumping high viscosity fluids

    B

    They are started with the discharge valve opened

    C

    The flow of liquid is developed by imparting energy due to the rotation of an impeller

    D

    They are always mounted in a horizontal position


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    Which of the following statements is true concerning any evaporator?（）
    A

    High conductivity of the distillate indicates distillate salinity is excessive

    B

    Increasing the absolute pressure of the shell will increase the distillers capacity

    C

    Mesh separators are used in evaporators to filter the distillate

    D

    Reducing the brine density will reduce the heat lost overboard


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    Which of the following statements is true concerning the cetane number of diesel fuel?（）
    A

    The cetane number affects the amount of injection lag

    B

    The cetane number is an indication of the fuels viscosity

    C

    Ignition lag is reduced with fuels having a high cetane number

    D

    The cetane number is of little significance in the combustion process


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Which of the following statements is correct concerning the “flash point ” of a liquid?（）
    A

    It is lower than the ignition temperature

    B

    It is the temperature at which a substance will spontaneously ignite

    C

    It is the temperature at which a substance, when ignited, will continue to bum

    D

    It is the temperature at which the released vapors will fall within the explosive range


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）
    A

    The greater the atomization, the greater the penetration

    B

    The greater the atomization, the less the penetration

    C

    The degree of atomization has nothing to do with the degree of penetration

    D

    Atomization and penetration are one and the same


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    Which of the following statements is correct concerning the viscosity of lubricating oil?（）
    A

    Viscosity will increase as temperature increases

    B

    Viscosity is a measure of a fluid s internal resistance to flow

    C

    Viscosity will decrease as temperature decreases

    D

    Viscosity is not dependent on temperature


    正确答案： B
    解析： 暂无解析

  • 第13题：

    If a vessel subject to PSC inspection, PSC Officer shall give the inspection to the Captain, the given timeframe for rectification of each deficiency is commonly given in a coded form which called “action code”, which code listed below is used for indication of detention of the vessel?（）

    • A、10
    • B、30
    • C、17
    • D、16

    正确答案:B

  • 第14题：

    单选题
    Which of the following statements concerning energy is correct?（）
    A

    Energy can be created or destroyed

    B

    Energy may not be transformed

    C

    The total quantity of energy in the universe is always the same

    D

    None of the above


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    If a vessel subject to PSC inspection, PSC Officer shall give the inspection to the Captain, the given timeframe for rectification of each deficiency is commonly given in a coded form which called “action code”, which code listed below is used for indication of detention of the vessel?（）
    A

    10

    B

    30

    C

    17

    D

    16


    正确答案： D
    解析： 暂无解析

  • 第16题：

    多选题
    Click the Exhibit button.   Given： Which two statements are true if a NullPointerException is thrown on line 3 of class C？（）
    A

    The application will crash.

    B

    The code on line 29 will be executed.

    C

    The code on line 5 of class A will execute.

    D

    The exception will be propagated back to line 27.

    E

    The code on line 5 of class B will execute.


    正确答案： A,D
    解析： 暂无解析

  • 第17题：

    多选题
    Which statements concerning the following code are true？（）   class a {   public a（） {}   public a（int i） { this（）； }   }   class b extends a {   public boolean b（String msg） { return false； }   }   class c extends b  {  private c（） { super（）； }   public c（String msg） { this（）； }   public c（int i） {}   }
    A

    The code will fail to compile.

    B

    The constructor in a that takes an int as an argument will never be called as a result of constructing an     object of class b or c.

    C

    Class c has three constructors.

    D

    Objects of class b cannot be constructed.

    E

    At most one of the constructors of each class is called as a result of constructing an object of class c.


    正确答案： E,D
    解析： 暂无解析

  • 第18题：

    单选题
    Which of the following statements is correct concerning heat transfer?（）
    A

    Heat is given off from a high temperature region known as a heat sink

    B

    Heat transfer rate is affected most by the size of the heat sink involved

    C

    Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink

    D

    Heat transfer by radiation will occur only by mass motion of a fluid substance


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    According to this passage, which of the following statements is FALSE?
    A

    Many employees don’t like a conservative dress code.

    B

    Comfortable clothes make employees more productive.

    C

    A casual clothes code is welcomed by young employees.

    D

    All the employers in the U. S. are for casual office wear.


    正确答案： C
    解析：
    信息题。A选项“许多员工不喜欢保守的着装规定”和原文第三段“85 percent of employers said that they believe that casual dress improves employee morale”内容相符；B选项“舒适的着装能提高员工的工作效率”体现在原文中“... people seem happier and more productive when they are wearing comfortable clothes”；C选项“休闲的着装规定很受年轻雇员的欢迎”和原文“A lot of young people don’t want to dress up for work”相符；D选项“美国所有的雇主都支持休闲着装的原则”和原文85%不符，答案为D选项。

  • 第20题：

    单选题
    Which of the following statements concerning fire-tube boilers is correct?（）
    A

    Combustion gases flow through the tubes

    B

    Flames impinge on the tubes

    C

    Combustion occurs in the tubes

    D

    Water flows through the tubes


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    Which statements concerning the switch construct are true？（）
    A

    All switch statements must have a default label.

    B

    There must be exactly one label for each code segment in a switch statement.

    C

    The keyword continue can never occur within the body of a switch statement.

    D

    No case label may follow a default label within a single switch statement.

    E

    A character literal can be used as a value for a case label.


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    Which of the following statements is true concerning an oil cooler?（）
    A

    The oil temperature is less than the cooling water temperature

    B

    The oil pressure is less than the cooling water pressure

    C

    The oil pressure is greater than the cooling water pressure

    D

    The oil flow control valve is always installed in the oil input line


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）
    A

    The agent is considered nontoxic at room temperature in low concentrations

    B

    The agent is less effective than carbon dioxide

    C

    Halon primarily extinguishes the fire by cooling

    D

    The agent cannot be used on electrical fires because it leaves a residue


    正确答案： B
    解析： 暂无解析

  • 第24题：

    多选题
    Given the following code fragment：     public void create（） {     Vector myVect；     myVect = new Vector（）；      }  Which of the following statements are true？（）
    A

    The declaration on line 2 does not allocate memory space for the variable myVect.

    B

    The declaration on line 2 allocates memory space for a reference to a Vector object.

    C

    The statement on line 2 creates an object of class Vector.

    D

    The statement on line 3 creates an object of class Vector.

    E

    The statement on line 3 allocates memory space for an object of class Vector.


    正确答案： B,C
    解析： SL-275中指出：要为一个新对象分配空间必须执行new Xxx（）调用，new调用执行以下的操作： 
    1．为新对象分配空间并将其成员初始化为0或者null。 
    2．执行类体中的初始化。（例如在类中有一个成员声明int a=10；在第一步后a=0 ，执行到第二步后a=10）    
    3．执行构造函数。 
    4．变量被分配为一个到内存堆中的新对象的引用。

相关内容