51. Which of the below is false about java coding?

1. 1. class constants should be used when we want to share data between class methods

   
   
   

   2. test case method names should be created as english sentences without spaces

   
   
   

   3. variable names should be such that they avoid ambiguity

   
   
   

   4. variable names should be short

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   variable names like i, a, abc, etc should be avoided. They should be real world names which avoid ambiguity. Test case name should explain its significance.

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52. Which of the below is true about java class structure?

1. 1. The class should only contain those attribute and functionality which it should; hence keeping it short

   
   
   

   2. The class attributes and methods should be public

   
   
   

   3. The class should have thousands of lines of code

   
   
   

   4. The class name should start with lowercase

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Class name should always start with upper case and contain those attribute and functionality which it should (Single Responsibility Principle); hence keeping it short. The attributes should be usually private with get and set methods.

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53. Which of the following is a best practice to measure time taken by a process for execution?

1. 1. System.getProcessingTime()

   
   
   

   2. System.getCurrentTime()

   
   
   

   3. System.nanoTime()

   
   
   

   4. System.currentTimeMillis()

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   System.nanoTime takes around 1/100000 th of a second whereas System.currentTimeMillis takes around 1/1000th of a second.

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54. Which of these methods will be invoked if a character is entered?

1. 1. keyEntered()

   
   
   

   2. keyTyped()

   
   
   

   3. keyPressed()

   
   
   

   4. keyReleased()

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   keyTyped()

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55. Which of the following is good coding practice to determine oddity?
    i)
    

    public boolean Calc(int n)
    {
    	return (n & 1)!= 0;
     }
    

    
    ii)
    

    public boolen Calc(int n)
    {
    	return n % 2 == 1;
    }
    

1. 1. i

   
   
   

   2. ii

   
   
   

   3. option (i) causes compilation error

   
   
   

   4. option (ii) causes compilation error

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Arithmetic and logical operations are much faster than division and multiplication.

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