D4 - M

What is Math.round(3.6)? a. 3.0 b. 3 c. 4 d. 4.0

What is Math.rint(3.6)? a. 3.0 b. 3 c. 4.0 d. 5.0

What is Math.rint(3.5)? a. 3.0 b. 3 c. 4 d. 4.0 e. 5.0

What is Math.ceil(3.6)? a. 3.0 b. 3 c. 4.0 d. 5.0

What is Math.floor(3.6)? a. 3.0 b. 3 c. 4 d. 5.0

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))

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.toRadian(0.5)) e. Math.sin(0.5)

Math.asin(0.5) returns _______. a. 30 b. Math.toRadians(30) c. Math.PI / 4 e. Math.PI / 2

Math.sin(Math.PI) returns _______. a. 0.0 b. 1.0 c. 0.5 e. 0.4

Math.cos(Math.PI) returns _______. a. 0.0 b. 1.0 c. -1.0 e. 0.5

Which of the following is the correct expression of character 4? a. 4 b. "4" c. ' 004' d. '4'

A Java character is stored in __________. a. one byte b. two bytes c. three bytes d. four bytes

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

Which of the following statement prints smithexam1test.txt? a. System.out.println("smithexam1test.txt"); b. System.out.println("smithexam1test.txt"); c. System.out.println("smith"exam1"test.txt"); d. System.out.println("smith"exam1"test.txt");

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 + " ");

The Unicode of 'a' is 97. What is the Unicode for 'c'? a. 96 b. 97 c. 98 d. 99

Will System.out.println((char)4) display 4? a. Yes b. No

What is the printout of System.out.println('z' - 'a')? a. 25 b. 26 c. a d. z

An int variable can hold __________. a. 'x' b. 120f c. 120.0 d. "x" e. "120"

Which of the following assignment statements is correct? a. char c = 'd'; b. char c = 1000001; c. char c = "d"; d. char c = "100";

'3' - '2' + 'm' / 'n' is ______. a. 0 b. 1 c. 2 d. 3

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')

Which of following is not a correct method in Character? a. isLetterOrDigit(char) b. isLetter(char) c. isDigit() d. toLowerCase(char)

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(65) e. x.equals("a") f. A & D

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.

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()); e. All the above

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

"abc".compareTo("aba") returns ___________. a. 1 b. 2 c. -1 d. -2 e. 0

"AbA".compareToIgnoreCase("abC") returns ___________. a. 1 b. 2 c. -1 d. -2 e. 0

What is the return value of "SELECT".substring(0, 5)? a. "SELECT" b. "SELEC" c. "SELE" d. "ELECT"

What is the return value of "SELECT".substring(4, 4)? a. an empty string b. C c. T d. E

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') ... e. All the above

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")

The expression "Java " + 1 + 2 + 3 evaluates to ________. a. Java123 b. Java6 c. Java 123 d. java 123 e. Illegal expression

Note that the Unicode for character A is 65. The expression "A" + 1 evaluates to ________. a. 66 b. B c. A1 d. Illegal expression

Note that the Unicode for character A is 65. The expression 'A' + 1 evaluates to ________. a. 66 b. B c. A1 d. Illegal expression

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);

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);

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.

You can cast a character value to an int, or an int to char. a. true b. false

Is 'a' larger than 'A'? a. Yes b. No

You can assign the value in ________ to an int variable. a. 'x' b. 93444444 c. 98.3 d. true

Which of the following is the correct expression of character a? a. 'a' b. "a" c. ' 00a' d. 'a'

Which of the following assignment statements is correct to assign character 5 to c? a. char c = '5'; b. char c = 5; c. char c = "5"; d. char c = "344";

The expression 'c' - 'e' is ________________. a. 2 b. -2 c. a random number d. invalid

What is "Welcome" + 1 + 1*2? a. Welcome11*2 b. Welcome4 c. Welcome12 d. Welcome3

parseInt is a method in the _______ class. a. Integer b. Double c. Math d. System

parseDouble is a method in the _______ class. a. Integer b. Double c. Math d. System

To concatenate s1, s2, s3, and s4, you write ______________. a. s1.concate(s2).concate(s3).concate(s4); b. s1.concate(s2) + s3.concate(s4); c. ((s1.concate(s2)).concate(s3)).concate(s4); d. s1.concate(s2).(concate(s3).concate(s4)); e. A,B & C

"unhappy".substring(2) returns "happy". a. true b. false

"smiles".substring(1, 5) returns "mile". a. true b. false

You compare two strings s1 and s2 using ________. a. compare(s1, s2) b. s1.compare(s2) c. compareTo(s1, s2) d. s1.compareTo(s2)

"ab".compareTo("aB") is _________. a. greater than 0 b. less than 0 c. equal to 0 d. less than or equal to 0

Which of the following statements are correct to concatenate string s1 into s2. a. s1 += s2; b. s2 += s1; c. s2.concate(s1); d. s1.concate(s2); e. B & C

Which of the following statements are incorrect? a. float f = 4.5; b. char c = "r"; c. String s = 'r'; d. int k = null; e. All the above.

"abcdefgh".subString(1, 3) returns ________. a. abc b. bcd c. bc d. cde

Assume that the ASCII code for character c is 99. What is the printout of the following code? System.out.println("a" + 'c'); a. a99 b. ac c. 9799 d. 196

Assume that the ASCII code for character c is 99 and for a is 97. What is the printout of the following code? System.out.println('a' + 'c'); a. a99 b. ac c. 9799 d. 196

Assume that the ASCII code for character c is 99 and for a is 97. What is the printout of the following code? System.out.println("AB" + 'a' + 'c'); a. ABac b. AB9799 c. ABa99 d. AB196

Which of the following is a possible output for (int)(51 * Math.random())? a. 0 b. 50 c. 100 d. 500 e. A & B

Which of the following method results in 8.0? a. Math.round(8.5) b. Math.rint(8.5) c. Math.ceil(8.5) d. Math.floor(7.5)

Which of the following method returns the sine of 90 degree? a. Math.sine(90) b. Math.sin(90) c. Math.sin(PI) d. Math.sin(Math.toRadian(90)) e. Math.sin(Math.PI)

Math.pow(3, 3) returns _______. a. 27 b. 9 c. 27.0 d. 9.0

Math.sqrt(4) returns _______. a. 2 b. 2.0 c. 1 d. 1.0

Math.ceil(5.5) evaluates to _____. a. 5.0 b. 6.0 c. 5 d. 6

Math.floor(5.5) evaluates to _____. a. 5.0 b. 6.0 c. 5 d. 6

Given two Strings s1 = "Welcome to Java" and s2 = "Programming is fun", which of the following is true? a. s1.equals(s2) b. s2.equals(s1) c. s1.contains(s2) d. s2.contains(s1) e. !s1.contains(s2)