Quiz 2

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

• 1

• 5

• 6

• 12

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 10

• 2 4 6 8 10 1

• 2 4 6 8 10 1 3 5 7 9

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

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

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

• 2 4 6 8

• 2 4 6 8 10

• 2 4 6 8 10 1

• 2 4 6 8 10 1 3 5 7 9

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

• CHARTAT()

• charat()

• chatAt()

• CharAt()

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

• +

• +=

• &

• ||

Which is the output of the following code fragement

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

• 4 8 1 5 9

• 2 6 10 3 7

• 2 6 10 3 7 0

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

• 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.

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

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

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.println(egArray[index]+ " ");

• index=0; index<egArray.length;index++

• index=length; index<0;index++

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

• index=length-1; index>0;index--;

Q5: What does this code output?

String[] nums = new String[] { "1", "9", "10" }; Arrays.sort(nums); System.out.println(Arrays.toString(nums));

• [1, 9, 10]

• [1, 10, 9]

• [10, 1, 9]

• None of the above

Java Array can allocate __________.

• Dynamic Memory

• Static Memory

• Both A and B

• None of the above