Tag: architecture

Questions Related to architecture

How do you change the value that is encapsulated by a wrapper class after you have instantiated it?
technology architecture

  1. Use the setXXX() method defined for the wrapper class.

  2. Use the parseXXX() method defined for the wrapper class.

  3. Use the equals() method defined for the wrapper class.

  4. The value encapsulated by a wrapper class is immutable.

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Correct Option: D

Which would be most suitable for storing data elements that must not appear in the store more than once, if searching is not a priority?
technology architecture

  1. Collection

  2. List

  3. Set

  4. Map

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Correct Option: D

How can you force garbage collection of an object?
technology architecture

  1. Call System.gc()

  2. Garbage collection cannot be forced.

  3. Call System.gc(), passing in a reference to the object to be garbage-collected.

  4. Call Runtime.gc()

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Correct Option: B

Which java clas represents SQL statements that are complied before they are executed
technology architecture

  1. Statement

  2. PreparedStatement

  3. ResultSet.

  4. Callable Statement

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Correct Option: B

A Vector is created, and three strings called Tinker, Evers and Chance are added to it. The method removeElement(“Evers”) is called. Which of the following Vector methods retrieve the string “Chance”?
technology architecture

  1. get(1);

  2. get(2);

  3. get(“Chance”);

  4. None of the above.

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Correct Option: A

How do you declare and initialize a String array with two elements in a single line of code?
technology architecture

  1. String [] strArr = [“element 1”, “element 2];

  2. String [] strArr = {“element 1”, “element 2”};

  3. String [] strArr = (“element 1”, “element2”);

  4. String [] strArr = new String [“element 1” , “element 2”];

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Correct Option: B

Your Company’s web-site offers the customers price comparisons of different products. You are in charge of converting the web-based solution over to the appropriate J2EE technology. Which of the following should you use?
technology architecture

  1. JSP, Servlets.

  2. JSP, Servlets, EJBs

  3. Applets, EJBs

  4. No need to change it.

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Correct Option: A

Which statement is not true when discussing the EJB tier?

technology architecture

  1. The EJB tier hosts the application-specific business objects.

  2. The EJB tier does not host system-level services (such as transaction management, concurrency control and security); they are hosted on the EIS tier.

  3. The EJB tier is a link between the web tier and the EIS integration tier.

  4. The EJB tier hosts the entity beans and session beans, data access objects and value objects and perhaps master-detail modeling using enterprise beans.

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Correct Option: B

What method can be used to help programmatically determine the caller’s identity within enterprise bean code?

technology architecture

  1. getIdentity()

  2. getCallerPrincipal()

  3. getCallerIdentity()

  4. getUserId()

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Correct Option: B

Containers and servers have the same function. What is the difference between an Enterprise Java Beans Container and an Enterprise JavaBeans Server?
technology architecture

  1. Containers run within servers.

  2. Servers run within containers.

  3. Only one server can run in a container.

  4. Only one container can run in a server.

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Correct Option: A