InfyTQ Arrays and String Quiz 2

Question 1

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

substring()

substring()

Substring()

Substring()

SubString()

SubString()

None of the mentioned

None of the mentioned

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Question 2

Time: 00:00:00
What will s2 contain after following lines of code?

 StringBuffer s1 = “prep”;

 StringBuffer s2 = s1.append(“insta”)

prep

prep

insta

insta

prepinsta

prepinsta

instaprep

instaprep

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Question 3

Time: 00:00:00
Which of these method of class StringBuffer is used to get the length of sequence of characters?

length()

length()

capacity()

capacity()

Length()

Length()

 Capacity()

 Capacity()

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Question 4

Time: 00:00:00
Examine the following program fragment:

 

  int[] array = { 1, 4, 3, 6, 8, 2, 5};

  int what = array[0];

 

  // scan the array

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

  { 

    if ( array[ index ] > what )   

      what = array[ index ];  

  }

  System.out.println( what );

1

1

5

5

1 2 3  4 5

1 2 3  4 5

8

8

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Question 5

Time: 00:00:00
 Examine the following program fragment:

 

  int[] array = { 1, 4, 3, 6, 8, 2, 5};

  int what = array[0];

 

  // scan the array

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

  { 

    if ( array[ index ] < what )   

      what = array[ index ];  

  }

  System.out.println( what ); 

5

5

1

1

1 4 3 6 8 2 5

1 4 3 6 8 2 5

8

8

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Question 6

Time: 00:00:00
Which of the following are incorrect form of StringBuffer class constructor?

StringBuffer()

StringBuffer()

StringBuffer(int size)

StringBuffer(int size)

StringBuffer(String str)

StringBuffer(String str)

StringBuffer(int size , String str)

StringBuffer(int size , String str)

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Question 7

Time: 00:00:00
 What will be the output of below statements?

String s = "prepinsta"; 

System.out.println(s.charAt(s.toUpperCase().length()));

Convert “Z” to int 90 and prints “90

Convert “Z” to int 90 and prints “90

Runtime Exception

Runtime Exception

Prints “z”

Prints “z”

Prints “Z”

Prints “Z”

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Question 8

Time: 00:00:00
Ques 20 

 What will be the output of below statements?

String s1 = "Prepinsta"; String s2 = "Prepinsta"; String s3 = new String("Prepinsta");

 System.out.print(s1 == s2);

System.out.print(s1 == s3);

. truefalse

. truefalse

truetrue

truetrue

falsefalse

falsefalse

 falsetrue

 falsetrue

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Question 9

Time: 00:00:00
Which of the following statements are True for StringBuffer and StringBuilder?

StringBuilder is not thread-safe.

StringBuilder is not thread-safe.

StringBuffer is thread safe because its methods are synchronized.

StringBuffer is thread safe because its methods are synchronized.

StringBuilder was introduced in Java 1.4

StringBuilder was introduced in Java 1.4

StringBuffer and StringBuilder are immutable.

StringBuffer and StringBuilder are immutable.

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Question 10

Time: 00:00:00
What will be the output of below statements?

String s1 = "abc"; String s2 = "def"; System.out.println(s1.compareTo(s2));

zero

zero

true

true

-3

-3

false

false

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["0","40","60","80","100"]
["Need more practice!","Keep trying!","Not bad!","Good work!","Perfect!"]
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April 2, 2021

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