Whizlabs offers SCJP 6.0 Exam Simulator with 420 questions as per the SCJP 6.0 certification exam. Following are couple of sample SCJP Dumps.

Topic: API Concepts

Question statement: Which of the following are true about the File class? Select two choices.

Choices:

  1. You can perform file I/O operations using its methods.
  2. You can find the size of a file using its size() method.
  3. You can check if a file exists using its exists() method.
  4. You can delete a file using its delete() method.





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Correct Anawer: C & D

Explaination:

Choices C and D are the correct answers. The exists() method of the File class returns true if the file given by the abstract path name physically exists. The delete() method can be used to delete the file represented by the File object. Choice A is incorrect because we cannot perform read/write operations on files using the File object. Choice B is incorrect because the File class does not define a size() method, it defines the length() method to find the size of a file. Reference: http://java.sun.com/j2se/1.5.0/docs/api/java/io/File.html


Topic: OO Concerpts

Question statement: Which of the following is true about the takeOrdersAndServe() method in the below code?

class Waitor
{
     void takeOrders(){}
     void serveFood(){}
     void takeOrdersAndServe()
     {
          takeOrders();
          serveFood();
     }
}

Choices:

  1. It exhibits high cohesion
  2. It exhibits low cohesion
  3. It exhibits tight coupling
  4. It exhibits loose coupling





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Correct Anawer: B

Explaination:

Choice B is the correct answer.

Cohesion refers to the number and diversity of tasks that a single unit is responsible for. If each unit is responsible for one single logical task, we say it has high cohesion.

Cohesion applies to classes and methods. Here the takeOrdersAndServe() method is not focused on a single task, so it shows low cohesion. A well designed unit will have high cohesion.

More about coupling, cohesion and other related concepts here.
http://satc.gsfc.nasa.gov/support/STC_APR98/apply_oo/apply_oo.html

 
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