Chapter 4

Question 1

Which of the following statement prints smith\exam1\test.txt?

Answer 1

System.out.println(“smith\exam1\test.txt”);

Question 2

Suppose x is a char variable with a value ‘b’. What is the output of the statement System.out.println(++x)?

Answer 2

c

Question 3

To check whether a char variable ch is an uppercase letter, you write ___________.

Answer 3

(ch >= ‘A’ && ch <= ‘Z’)

Question 4

[X]Which of the following is not a correct method in the Character class?

	isLetterOrDigit(char)
	isLetter(char)
	toLowerCase(char)
	toUpperCase()

Answer 4

toLowerCase(char)

Question 5

The statement System.out.printf(“%3.1f”, 1234.56) outputs ___________.

Answer 5

1234.6

Question 6

The __________ method parses a string s to an int value.

Answer 6

Integer.parseInt(s); (Capital I in Integer)

Question 7

The statement System.out.printf(“%5d”, 123456) outputs ___________.

Answer 7

123456

Question 8

The statement System.out.printf(“%10s”, 123456) outputs ___________. (Note: * represents a space)

Answer 8

**123456

Question 9

What is Math.rint(3.5)?

Answer 9

4.0

Question 10

What is Math.rint(3.6)?

Answer 10

4.0

Question 11

What is the return value of “SELECT”.substring(4, 4)?

Answer 11

An empty string

Question 12

“abc”.compareTo(“aba”) returns ___________.

Answer 12

2

Question 13

What is the return value of “SELECT”.substring(0, 5)?

Answer 13

“SELEC”

Question 14

[X]Note that the Unicode for character A is 65. The expression “A” + 1 evaluates to ________.

Answer 14

Illegal expression

Question 15

An int variable can hold __________.

Answer 15

120

Question 16

Note that the Unicode for character A is 65. The expression ‘A’ + 1 evaluates to ________.

Answer 16

66

Question 17

Suppose i is an int type variable. Which of the following statements display the character whose Unicode is stored in variable i?

Answer 17

System.out.println((char)i);

Question 18

Which of the following assignment statements is correct?
                char c = 'd';
		char c = '100';
		char c = "d";
		char c = "100";

Answer 18

char c = ‘d’;

Question 19

Which of the following is the correct expression of character 4?

Answer 19

‘4’

Question 20

Which of the following is the correct statement to return JAVA?

Answer 20

“Java”.toUpperCase()

Question 21

A Java character is stored in __________.

Answer 21

2 bytes

Question 22

The __________ method parses a string s to a double value.

Answer 22

Double.parseDouble(s);

Question 23

[X}Will System.out.println((char)4) display 4?

Answer 23

no

Question 24

[X}What is Math.round(3.6)?

Answer 24

4.0

Question 25

Suppose s1 and s2 are two strings. What is the result of the following code?
s1.equals(s2) == s2.equals(s1)

Answer 25

true