InfyTQ Arrays and String Quiz 1

Question 1

Time: 00:00:00
 What is the length of the following array: byte[] data = { 12, 34, 9, 0, -62, 88 };

1

1

5

5

6

6

12

12

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Question 2

Time: 00:00:00
Which of these class is   superclass of String and StringBuffer class?

 java.util

 java.util

ArrayList

ArrayList

java.lang

java.lang

None of the mentioned

None of the mentioned

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Question 3

Time: 00:00:00
  What is the output of the following code fragment:

   int[] arr = { 2, 4, 6, 8, 10, 1, 3, 5, 7, 9 };

 

    for ( int index= 0 ; index < 5 ; index++  )

      System.out.print(  arr[ index ] + "  "  );

2 4 6 8

2 4 6 8

 2 4 6 8 10

 2 4 6 8 10

 2 4 6 8 10 1

 2 4 6 8 10 1

 2 4 6 8 10 1 3 5 7 9

 2 4 6 8 10 1 3 5 7 9

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Question 4

Time: 00:00:00
What is the output of the following code fragment:

   int[] arr = { 2, 4, 6, 8, 10, 1, 3, 5, 7, 9 };

 

    for ( int index= 0 ; index < egArray.length ; index++  )

      System.out.print(  arr[ index ] + "  "  );

 2 4 6 8

 2 4 6 8

2 4 6 8 10

2 4 6 8 10

 2 4 6 8 10 1

 2 4 6 8 10 1

  2 4 6 8 10 1 3 5 7 9

  2 4 6 8 10 1 3 5 7 9

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Question 5

Time: 00:00:00
 Which of these operators can be used to concatenate two or more String objects?

+

+

+=

+=

&

&

||

||

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Question 6

Time: 00:00:00
Which of these method of class String is used to extract a single character from a String object?

CHARAT()

CHARAT()

charat()

charat()

charAt()

charAt()

ChatAt()

ChatAt()

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Question 7

Time: 00:00:00
Which of these constructors is used to create an empty String object?

string()

string()

String(void)

String(void)

 String(0)

 String(0)

None of the mentioned

None of the mentioned

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Question 8

Time: 00:00:00
What is the output of the following code fragment:

   int[] egArray = { 2, 4, 6, 8, 10, 1, 3, 5, 7, 9 };

 

    for ( int index= 0 ; index < egArray.length ; index = index + 2  )

      System.out.print(  egArray[ index ] + "  "  );

2 4 6 8 10 1 3 5 7 9

2 4 6 8 10 1 3 5 7 9

4 8 1 5 9

4 8 1 5 9

2 6 10 3 7

2 6 10 3 7

2 6 10 3 7 0

2 6 10 3 7 0

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Question 9

Time: 00:00:00
 Does a programmer always know how long an array will be when the program is being written?

Yes---the program will not compile without the length being declared.

Yes---the program will not compile without the length being declared.

No---the array object is created when the program is running, and the length might change from run to run.

No---the array object is created when the program is running, and the length might change from run to run.

Yes---otherwise the program will not run correctly.

Yes---otherwise the program will not run correctly.

 No---arrays can grow to whatever length is needed.

 No---arrays can grow to whatever length is needed.

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Question 10

Time: 00:00:00
 Fill in the blanks of the following code fragment so that the elements of the array are printed in reverse order, starting with the last element.

   int[] egArray = { 2, 4, 6, 8, 10, 1, 3, 5, 7, 9 };

 

    for ( int index= ________ ; _____________ ; ______________ )

      System.out.print(  egArray[ index ] + "  "  );

index = 0; index < egArray.length; index--

index = 0; index < egArray.length; index--

 index = length; index < 0; index--

 index = length; index < 0; index--

index = length-1; index > 0; index--

index = length-1; index > 0; index--

 index = egArray.length-1; index >= 0; index--

 index = egArray.length-1; index >= 0; index--

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April 2, 2021