多选题Given a class whose instances, when found in a collection of objects, are sorted by using the compareTo（　）method, which two statements are true?（）AThe class implements java.lang.Comparable.BThe class implements java.util.Comparator.CThe interface used

第1题：

Which two demonstrate an “is a” relationship？（）   

• A、 public interface Person { }  public class Employee extends Person { }
• B、 public interface Shape { }  public class Employee extends Shape { }
• C、 public interface Color { }  public class Employee extends Color { }
• D、 public class Species { }  public class Animal （private Species species；）
• E、 interface Component { }  Class Container implements Component （ Private Component[ ] children；  ）

第2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.

第3题：

class A {  }  class Alpha {  private A myA = new A（）；  void dolt（ A a ） {  a = null；  }  void tryIt（） {  dolt（ myA ）；  }  }  Which two statements are correct？（）  

• A、 There are no instanced of A that will become eligible for garbage collection.
• B、 Explicitly setting myA to null marks that instance to be eligible for garbage collection.
• C、 Any call on tryIt（） causes the private instance of A to be marked for garbage collection.
• D、 Private instances of A become eligible for garbage collection when instances of Alpha become eligible for garbage collection.

第4题：

Given a class whose instances， when found in a collection of objects， are sorted by using the compare To 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.

第5题：

You work as an application developer at Certkiller .com. You are developing a collection class named ClientCollection， which is to be used for storing the names of Certkiller .com’s clients that are situated in various geographical areas. These client names are represented by the Client class. You are planning to create a method named SortClients in the ClientCollection class to arrange Client objects in ascending order. You need to ensure that the appropriate interface is implemented by the Client class to allow sorting.What interface should be used？（）

• A、 IDictionary
• B、 IComparable
• C、 IComparer
• D、 IEqualityComparer

第6题：

第7题：

第8题：

第9题：

第10题：

第11题：

第12题：

第13题：

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.

第14题：

You want to create a filter for your web application and your filter will implement javax.servlet.Filter. Which two statements are true？（）

• A、Your filter class must implement an init method and a destroy method.
• B、Your filter class must also implement javax.servlet.FilterChain.
• C、When your filter chains to the next filter， it should pass the same arguments it received in its doFiltermethod.
• D、The method that your filter invokes on the object it received that implements javax.servlet.FilterChaincan invoke either another filter or a servlet.
• E、Your filter class must implement a doFilter method that takes， among other things， anHTTPServletRequest object and an HTTPServletResponse object.

第15题：

Which statement is true？（）

• A、A class’s finalize（） method CANNOT be invoked explicitly.
• B、super.finalize（） is called implicitly by any overriding finalize（） method.
• C、The finalize（） method for a given object is called no more than once by the garbage collector.
• D、The order in which finalize（） is called on two objects is based on the order in which the two objects became finalizable.

第16题：

Which two statements are true about the hashCode method？（）

• 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.

第17题：

You are defining a class named MyClass that contains several child objects. MyClass contains a method named ProcessChildren that performs actions on the child objects.MyClass objects will be serializable.You need to ensure that the ProcessChildren method is executed after the MyClass object and all its child objects are reconstructed. Which two actions should you perform？（）

• A、Apply the OnDeserializing attribute to the ProcessChildren method.
• B、Specify that MyClass implements the IDeserializationCallback interface.
• C、Specify that MyClass inherits from the ObjectManager class.
• D、Apply the OnSerialized attribute to the ProcessChildren method.
• E、Create a GetObjectData method that calls ProcessChildren.
• F、Create an OnDeserialization method that calls ProcessChildren.

第18题：

第19题：

第20题：

第21题：

第22题：

第23题：

第24题：