Chapter 4 Quiz

Note that the Unicode for character A is 65. The expression 'A' + 1 evaluates to ________. A. 66 B. B C. A1 D. Illegal expression

A

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

A

To obtain the arc sine of 0.5, use _______. A. Math.asin(0.5) B. Math.asin(Math.toDegrees(0.5)) C. Math.sin(Math.toRadians(0.5)) D. Math.sin(0.5)

A

What is the output of System.out.println('z' - 'a')? A. 25 B. 26 C. a D. z

A

What is the return value of "SELECT".substring(4, 4)? A. an empty string B. C C. T D. E

A

What is Math.floor(3.6)? A. 3.0 B. 3 C. 4 D. 5.0

A Note floor returns double value

Math.sin(Math.PI) returns _______. A. 0.0 B. 1.0 C. 0.5 D. 0.4

A Note that Math.PI is 180 degrees

An int variable can hold __________. A. 'x' B. 120 C. 120.0 D. "x" E. "120"

A and B

Which of the following assignment statements is correct? A. char c = 'd'; B. char c = 100; C. char c = "d"; D. char c = "100";

A and B

Suppose Character x = new Character('a'), __________________ returns true. A. x.equals(new Character('a')) B. x.compareToIgnoreCase('A') C. x.equalsIgnoreCase('A') D. x.equals('a') E. x.equals("a")

A and D

To check if a string s contains the prefix "Java", you may write A. if (s.startsWith("Java")) ... B. if (s.indexOf("Java") == 0) ... C. if (s.substring(0, 4).equals("Java")) ... D. if (s.charAt(0) == 'J' && s.charAt(1) == 'a' && s.charAt(2) == 'v' && s.charAt(3) == 'a') ...

A, B, C and D

Which of the following are valid specifiers for the printf statement? A. %4c B. %10b C. %6d D. %8.2d E. %10.2e

A, B, C and E

Suppose s1 and s2 are two strings. Which of the following statements or expressions is incorrect? A. String s3 = s1 - s2; B. boolean b = s1.compareTo(s2); C. char c = s1[0]; D. char c = s1.charAt(s1.length());

A, B, C, and D

To check if a string s contains the suffix "Java", you may write A. if (s.endsWith("Java")) ... B. if (s.lastIndexOf("Java") >= 0) ... C. if (s.substring(s.length() - 4).equals("Java")) ... D. if (s.substring(s.length() - 5).equals("Java")) ... E. if (s.charAt(s.length() - 4) == 'J' && s.charAt(s.length() - 3) == 'a' && s.charAt(s.length() - 2) == 'v' && s.charAt(s.length() - 1) == 'a') ...

A, C and E

"abc".compareTo("aba") returns ___________. A. 1 B. 2 C. -1 D. -2 E. 0

B

'3' - '2' + 'm' / 'n' is ______. A. 0 B. 1 C. 2 D. 3

B

A Java character is stored in __________. A. one byte B. two bytes C. three bytes D. four bytes

B

Suppose i is an int type variable. Which of the following statements display the character whose Unicode is stored in variable i? A. System.out.println(i); B. System.out.println((char)i); C. System.out.println((int)i); D. System.out.println(i + " ");

B

The __________ method parses a string s to an int value. A. integer.parseInt(s); B. Integer.parseInt(s); C. integer.parseInteger(s); D. Integer.parseInteger(s);

B

To check whether a char variable ch is an uppercase letter, you write ___________. A. (ch >= 'A' && ch >= 'Z') B. (ch >= 'A' && ch <= 'Z') C. (ch >= 'A' || ch <= 'Z') D. ('A' <= ch <= 'Z')

B

To obtain the sine of 35 degrees, use _______. A. Math.sin(35) B. Math.sin(Math.toRadians(35)) C. Math.sin(Math.toDegrees(35)) D. Math.sin(Math.toRadian(35)) E. Math.sin(Math.toDegree(35))

B

What is the return value of "SELECT".substring(0, 5)? A. "SELECT" B. "SELEC" C. "SELE" D. "ELECT"

B

Which of the following statement prints smith\exam1\test.txt? A. System.out.println("smith\exam1\test.txt"); B. System.out.println("smith\\exam1\\test.txt"); C. System.out.println("smith\"exam1\"test.txt"); D. System.out.println("smith"\exam1"\test.txt");

B

Will System.out.println((char)4) display 4? A. Yes B. No

B

Math.asin(0.5) returns _______. A. 30 B. Math.toRadians(30) C. Math.PI / 4 D. Math.PI / 2

B Math.asin returns an angle in radians

Analyze the following code: int i = 3434; double d = 3434; System.out.printf("%5.1f %5.1f", i, d); A. The code compiles and runs fine to display 3434.0 3434.0. B. The code compiles and runs fine to display 3434 3434.0. C. i is an integer, but the format specifier %5.1f specifies a format for double value. The code has an error.

C

Math.cos(Math.PI) returns _______. A. 0.0 B. 1.0 C. -1.0 D. 0.5

C

Suppose s is a string with the value "java". What will be assigned to x if you execute the following code? char x = s.charAt(4); A. 'a' B. 'v' C. Nothing will be assigned to x, because the execution causes the runtime error StringIndexOutofBoundsException.

C

Suppose x is a char variable with a value 'b'. What is the output of the statement System.out.println(++x)? A. a B. b C. c D. d

C

The expression "Java " + 1 + 2 + 3 evaluates to ________. A. Java123 B. Java6 C. Java 123 D. java 123 E. Illegal expression

C

The statement System.out.printf("%5d", 123456) outputs ___________. A. 12345 B. 23456 C. 123456 D. 12345.6

C

Which of the following is the correct statement to return JAVA? A. toUpperCase("Java") B. "Java".toUpperCase("Java") C. "Java".toUpperCase() D. String.toUpperCase("Java")

C

What is Math.ceil(3.6)? A. 3.0 B. 3 C. 4.0 D. 5.0

C Note ceil returns double value

What is Math.rint(3.6)? A. 3.0 B. 3 C. 4.0 D. 5.0

C Note rint returns a double value

What is Math.round(3.6)? A. 3.0 B. 3 C. 4 D. 4.0

C Note round returns an int value

Note that the Unicode for character A is 65. The expression "A" + 1 evaluates to ________. A. 66 B. B C. A1 D. Illegal expression

C When a sting adds with a number, the number is converted to a string

Which of the following is not a correct method in the Character class? A. isLetterOrDigit(char) B. isLetter(char) C. isDigit() D. toLowerCase(char) E. toUpperCase()

C and E

____________________ returns true. A. "peter".compareToIgnoreCase("Peter") B. "peter".compareToIgnoreCase("peter") C. "peter".equalsIgnoreCase("Peter") D. "peter".equalsIgnoreCase("peter") E. "peter".equals("peter")

C, D, and E

"AbA".compareToIgnoreCase("abC") returns ___________. A. 1 B. 2 C. -1 D. -2 E. 0

D

The Unicode of 'a' is 97. What is the Unicode for 'c'? A. 96 B. 97 C. 98 D. 99

D

The __________ method parses a string s to a double value. A. double.parseDouble(s); B. Double.parsedouble(s); C. double.parse(s); D. Double.parseDouble(s);

D

The statement System.out.printf("%10s", 123456) outputs ___________. (Note: * represents a space) A. 123456**** B. 23456***** C. 12345***** D. ****123456

D

The statement System.out.printf("%3.1e", 1234.56) outputs ___________. A. 0.1e+04 B. 0.123456e+04 C. 0.123e+04 D. 1.2e+03 E. 1.23+03

D

Which of the following is the correct expression of character 4? A. 4 B. "4" C. '\0004' D. '4'

D

What is Math.rint(3.5)? A. 3.0 B. 3 C. 4 D. 4.0 E. 5.0

D Note rint returns nearest even int as a double since 3.5 is equally close to 3.0 and 4.0

The statement System.out.printf("%3.1f", 1234.56) outputs ___________. A. 123.4 B. 123.5 C. 1234.5 D. 1234.56 E. 1234.6

E