Array

Question 1

It stores a fixed-size sequential collection of elements of the same type.

Answer 1

Array

Question 2

consist of contiguous memory locations. The lowest address corresponds to the first element and the highest address to the last element.

Answer 2

Array

Question 3

Syntax for declaring an array variable

Answer 3

datatype[] arrayName;

Question 4

Syntax for creating an array

Answer 4

arrayName= new datatype[arraySize];

Question 5

What are the two things that the following statement does?
arrayName= new datatype[arraySize]

Answer 5

• It creates an array using new dataType[arraySize].
• It assigns the reference of the newly created array to the variable arrayName.

Question 6

Syntax for declaring array variable, creating an array, and assigning the reference of the array to the variable in one line

Answer 6

datatype[] arrayName = new datatype[arraySize];

Question 7

Identify the parts of the following.
char[] letters = new char[41];

Answer 7

char - data type
letters - array name
[41] - array size

Question 8

What is the highest index of array?

Answer 8

The highest index of array is the array size - 1

Question 9

What number does the array in Java always start in?

Answer 9

The array in Java always start in zero

Question 10

What is the value of the array if not initialized?

Answer 10

The array value if not initialized is zero for number/null for the object

Question 11

The number that is assigned to each element in an array

Answer 11

Subscript

Question 12

used as an index to pinpoint a specific element within an array

Answer 12

Subscript

Question 13

Identify the values of the elements.
int[] num = new int[6];
num[1]= 20;
num[4]= 15;
num[3]= num[1] + num[4];
int x= 2;
num[x] = 5;
int y=1;
num[y-1] = 40;
num[4++]=18;

Answer 13

num[1] - 20
num[2] - 5
num[3] - 35
num[4] - 15
num[5] - 18

Question 14

What would happen?
int[] num = new int[6];

Answer 14

Array IndexOutofBound Error since the highest index of array subscript is 5 only

Question 15

Can you can read values from the keyboard and store them in an array element?

Answer 15

Yes

Question 16

This public field contains the number of elements in the array.

Answer 16

length

Question 17

can be used in looping instead of the actual size of the array

Answer 17

length

Question 18

Syntax for array initialization

Answer 18

datatype [] arrayName = {v1, v2, v3…..vn}

Question 19

Java provides a specialized version of the for loop that, in many circumstances, simplifies array processing.

Answer 19

Enhanced for loop

Question 20

designed to iterate once for every element in an array.

Answer 20

Enhanced for loop

Question 21

What is the general format of the enhanced for loop?

Answer 21

for (datatype variable: array) {

}

Question 22

Identify the parts of the enhanced for loop
for (datatype variable: array) {

}

Answer 22

datatype variable - It is a variable declaration. This variable will receive the value of a different array element during each loop iteration. During the first loop iteration, it receives the value of the first element; during the second iteration, it receives the value of the second element, and so on.
array - It is the name of an array on which you wish the loop to operate. The loop will iterate once for every element in the array.

Question 23

What would the output be?
int[] num = { 12, 56, 78, 90, 92 };
System.out.println(“Enhance For Loop”);
for(int number : num){
System.out.print(number + “ “);
}

Answer 23

Enhance For Loop
12 56 78 90 92