QUESTION 7 In the class String , the substring method extracts a string from wit

Question

QUESTION 7

In the class String , the substring method extracts a string from within another string.

True

False

QUESTION 8

A class can have only one constructor.

True

False

QUESTION 9

The DecimalFormat class can be used only to format the output of decimal numbers.

True

False

QUESTION 10

The . (dot) operator is also called the member access operator.

True

False

QUESTION 11

The built-in operation that is valid for classes is the dot operator (.).

True

False

QUESTION 12

A constructor has no type and is therefore a void method.

True

False

QUESTION 13

The word new is an operator.

True

False

QUESTION 14

If the specified output file does not exist, the computer prepares an empty file for output.

True

False

QUESTION 15

Arrays have a fixed number of components.

True

False

QUESTION 16

In row processing, a two-dimensional array is processed one row at a time.

True

False

QUESTION 17

indexOf(char ch) is a method in the class String .

True

False

QUESTION 18

Primitive type variables directly store data into their memory space.

True

False

QUESTION 19

If a member of a class is a method, it can (directly) access any member of the class.

True

False

QUESTION 20

The modifier static in the heading specifies that the method can be invoked by using the name of the class.

True

False

QUESTION 21

The new operator can be used to create a class object.

True

False

QUESTION 22

In column processing, a two-dimensional array is processed one column at a time.

True

False

QUESTION 23

The method length in the class String returns the number of characters in the string not including whitespace characters.

True

False

QUESTION 24

A get method of a class changes the values of the data members of the class.

True

False

QUESTION 25

Every object has access to a reference to itself.

True

False

QUESTION 26

When writing output to a file, if the file is not closed at the end of the program, you may not be able to view your output properly.

True

False

QUESTION 27

Suppose that you have the following declarations.

int[] alpha = new int[100];
int[][] beta = new int[25][4];

In this declaration, the array alpha has more components than the array beta.

True

False

QUESTION 28

The following statements creates alpha to be a two-dimeansional array of 25 rows and 10 columns.

int[][] alpha = new int[25][10];

True

False

Explanation / Answer

7.n the class String , the substring method extracts a string from within another string:   True

8.A class have a multiple constructors : False

9.The DecimalFormat class can be used only to format the output of decimal numbers: True

10.The . (dot) operator is also called the member access operator: True

11.The built-in operation that is valid for classes is the dot operator (.): True

12.A constructor has no type and is therefore a void method : False

13.The word new is an operator : True

14.If the specified output file does not exist, the computer prepares an empty file for output : True

15.Arrays have a fixed number of components: True

16.In row processing, a two-dimensional array is processed one row at a time: True

17.indexOf(char ch) is a method in the class String : True

18.Primitive type variables directly store data into their memory space :True

19.If a member of a class is a method, it can (directly) access any member of the class: True

20.The modifier static in the heading specifies that the method can be invoked by using the name of the class :True

21.The new operator can be used to create a class object : True

22.In column processing, a two-dimensional array is processed one column at a time: True

23.The method length in the class String returns the number of characters in the string not including whitespace characters: False

24.A get method of a class changes the values of the data members of the class: False

25.Every object has access to a reference to itself :True

26.When writing output to a file, if the file is not closed at the end of the program, you may not be able to view your output properly: True

27.False

28.True

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