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Which of the following statements are true？（） A、 The equals（） method determines if reference values refer to the same object.B、 The == operator determines if the contents and type of two separate objects match.C、 The equals（） method returns true only when

题目

Which of the following statements are true？（） 

  • A、 The equals（） method determines if reference values refer to the same object.
  • B、 The == operator determines if the contents and type of two separate objects match.
  • C、 The equals（） method returns true only when the contents of two objects match.
  • D、 The class File overrides equals（） to return true if the contents and type of two separate objects        match.
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相似问题和答案

第1题：

Which of the following statements regarding routed and routing protocols are true?()

A. A routed protocol is assigned to an interface and determines the method of packet deliver.

B. A routing protocol determines the path of a packet through a network.

C. A routed protocol determines the path of a packet through a network.

D. A routing protocol operates at the transport layer of the OSI model.

E. A routed protocol updates the routing table of a router.


参考答案：A, B

第2题：

1. public class Person {  2. private String name；  3. public Person（String name） { this.name = name； }  4. public boolean equals（Person p） {  5. return p.name.equals（this.name）；  6. }  7. }  Which is true？（） 

  • A、 The equals method does NOT properly override the Object.equals method.
  • B、 Compilation fails because the private attribute p.name cannot be accessed in line 5.
  • C、 To work correctly with hash-based data structures， this class must also implement the hashCode method.
  • D、 When adding Person objects to a java.util.Set collection， the equals method in line 4 will prevent duplicates.

正确答案:A

第3题：

Which two are true?()

A.A finalizer may NOT be invoked explicitly.

B.The finalize method declared in class Object takes no action.

C.super.finalize（）is called implicitly by any over riding finalize method.

D.The finalize method for a given objec twill be called no more than once by the garbage collector.

E.The order in which finalize will be called on two objects is based on the order in which the two objects became finalizable.


参考答案：B, D

第4题：

Given that b and c refer to instances of wrapper classes， which two statements are true？（）

  • A、 b.equals（b） returns true.
  • B、 b.equals（c） returns the same result as b == c.
  • C、 b.eqials（c） can return false even if c.equals（b） returns true.
  • D、 b.equals（c） throws an exception if b and c are different wrapper types.
  • E、 b.equals（c） returns false if the type of wrapper objects being compared are different.

正确答案:B,C

第5题：

Which two statements are true regarding the return values of property written hashCode and equals methods from two instances of the same class？（）

  • A、 If the hashCode values are different， the objects might be equal.
  • B、 If the hashCode values are the same， the object must be equal.
  • C、 If the hashCode values are the same， the objects might be equal.
  • D、 If the hashCode values are different， the objects must be unequal.

正确答案:C,D

第6题：

Part of the job as a network administrator is being able to make a distinction between routed protocols and routing protocols. Which of the following statements is true regarding them?()

A. A routing protocol is assigned to an interface and determines the method of packet delivery.

B. A routed protocol is assigned to an interface and determines the method of packet delivery.

C. A routing protocol determines the path of a packet through a network.

D. A routed protocol determines the path of a packet through a network.

E. A routing protocol operates at the transport layer of the OSI model.

F. A routed protocol updates the routing table of a router.


参考答案：B, C

第7题：

Which two of statements are true？（）

  • A、It is possible to synchronize static methods.
  • B、When a thread has yielded as a result of yield（）， it releases its locks.
  • C、When a thread is sleeping as a result of sleep（）， it releases its locks.
  • D、The Object.wait（） method can be invoked only from a synchronized context.
  • E、The Thread.sleep（） method can be invoked only from a synchronized context.
  • F、When the thread scheduler receives a notify（） request， and notifies a thread， that thread immediately releases its lock.

正确答案:A,D

第8题：

Given a class whose instances, when found in a collection of objects, are sorted by using the compareTo()method, which two statements are true?()

A.The class implements java.lang.Comparable.

B.The class implements java.util.Comparator.

C.The interface used to implement sorting allows this class to define only one sort sequence.

D.The interface used to implement sorting allows this class to define many different sort sequences.


参考答案：A, C

第9题：

Which of the following statements about variables and scope are true？（） 

  • A、 Local variables defined inside a method are destroyed when the method is exited.
  • B、 Local variables are also called automatic variables.
  • C、 Variables defined outside a method are created when the object is constructed.
  • D、 A method parameter variable continues to exist for as long as the object is needed in which the method is defined.

正确答案:A,B,C

第10题：

Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）

  • A、The class implements java.lang.Comparable.
  • B、The class implements java.util.Comparator.
  • C、The interface used to implement sorting allows this class to define only one sort sequence.
  • D、The interface used to implement sorting allows this class to define many different sort sequences.

正确答案:A,C

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