question

The integer Data type (int) does not include the following data type.. 1. long 2. double 3. byte 4. short

answer

2. double

question

Which of the following data types comes under floating point data types? 1. long 2. float & long 3. byte 4. double & float

answer

4. double & float

question

Any assignment statement can be used as an assignment expression.

answer

true

question

The expression 4 + 20 / (3 - 1) * 2 is evaluated to ________.

answer

24

question

To obtain the current hour in UTC, use ________. System.currentTimeMillis() % 3600 System.currentTimeMillis() % 60 System.currentTimeMillis() / 1000 % 60 System.currentTimeMillis() / 1000 / 60 % 60 System.currentTimeMillis() / 1000 / 60 / 60 % 24

answer

System.currentTimeMillis() / 1000 / 60 / 60 % 24

question

Which of the following assignment statements is incorrect? i = j = k = 1; i = 1; j = 1; k = 1; i = 1 = j = 1 = k = 1; i == j == k == 1;

answer

i = 1 = j = 1 = k = 1; i == j == k == 1;

question

24 % 5 is ________.

answer

4

question

A variable may be assigned a value only once in the program.

answer

false

question

If a number is too large to be stored in a variable of the float type, it ________.

answer

causes overflow

question

If you attempt to add an int, a byte, a long, and a double, the result will be a ________ value.

answer

double

question

Math.pow(4, 1 / 2) returns ________.

answer

1.0

question

The expression (int)(76.0252175 * 100) / 100 evaluates to ________.

answer

76

question

To assign a double variable d to an int variable x, you write ________.

answer

x = (int)d;

question

To declare a constant MAX_LENGTH inside a method with value 99.98, you write ________.

answer

final double MAX_LENGTH = 99.98;

question

What is printed? int j = 0; int i = j++ +j*5; System.out.println(i);

answer

5

question

What is the result of 45 / 4?

answer

11

question

What is the value of (double)5/2?

answer

2.5

question

pow is a method in the ________ class.

answer

Math

question

currentTimeMills is a method in the ________ class.

answer

System

question

________ are valid Java identifiers. $Java _RE4 3ere 4+4 int

answer

$Java _RE4

question

You can define a variable twice in a block.

answer

false

question

You can change the value of a constant.

answer

false

question

You can cast a double value to ________. byte short int long float

answer

byte short int long float

question

You can always assign a value of long type to a variable of int type without loss of precision.

answer

false

question

Which of these data types requires the most amount of memory? long int short byte

answer

long

question

Which of these data types requires the least amount of memory? double float short byte

answer

byte

question

Which of the following statements are the same? (A) x -= x + 4 (B) x = x + 4 - x (C) x = x - (x + 4)

answer

(A) & (C)

question

Which of the following is a valid identifier? $343 class 9X 8+9 radius

answer

$343 radius

question

Which of the following expressions will yield 0.5? 1 / 2 1.0 / 2 (double) (1 / 2) (double) 1 / 2 1 / 2.0

answer

1.0 / 2 (double) 1 / 2 1 / 2.0

question

Which of the following are correct names for variables according to Java naming conventions? radius Radius RADIUS findArea FindArea

answer

radius findArea

question

___________ is also referred to as the Software Life Cycle, which includes from beginning to end, all of the tasks which are completed while developing your application.

answer

The Software Development Process

question

1. What are the 6 attributes of all variables regardless of computer language or OS? 2. Which attribute is optional

answer

Name (Optional) Memory Location Type Value Scope Lifetime

question

Java source code can be executed on a Java Virtual Machine.

answer

false

question

One byte has ________ bits.

answer

8

question

Why do computers use zeros and ones?

answer

because digital devices have two stable states and it is natural to use one state for 0 and the other for 1.

question

If a program compiles fine, but it produces incorrect result, then the program suffers ________.

answer

a logic error

question

If you forget to put a closing quotation mark on a string, what kind error will be raised?

answer

a compilation error

question

Programming style is important, because ________. a program may not compile if it has a bad style good programming style can make a program run faster good programming style makes a program more readable good programming style helps reduce programming errors

answer

good programming style makes a program more readable good programming style helps reduce programming errors

question

Suppose you define a Java class as follows: public class Test { } In order to compile this program, the source code should be stored in a file named ________.

answer

Test.java

question

The ________ loads Java bytecode to the memory.

answer

class loader

question

The compiler generates bytecode even if the program has syntax errors

answer

false

question

The extension name of a Java source code file is ________.

answer

.java

question

The main method header is written as ________.

answer

public static void main(String[] args)

question

The keywords in Java are all in lowercase.

answer

true

question

A ________ is a program that translates Java source code into Java bytecode.

answer

Java interpreter

question

__________ translates high-level language program into machine language program.

answer

A compiler

question

You use ________ to run a Java program.

answer

java

question

The _________ must be the same as the filename that contains the class.

answer

public classname

question

________ is a software that interprets Java bytecode.

answer

Java virtual machine

question

________ is a program that runs on a computer to manage and control a computer's activities.

answer

Operating system

question

________ contains predefined classes and interfaces for developing Java programs.

answer

Java API

question

________ consists of a set of separate programs for developing and testing Java programs, each of which is invoked from a command line.

answer

Java JDK

question

Java compiler translates Java source code into ________.

answer

Java bytecode

question

"abcdefgh".subString(1, 3) returns ________.

answer

bc

question

A Java character is stored in ________.

answer

two bytes

question

An int variable can hold ________. 'x' 120 120.0

answer

'x' 120

question

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

answer

true

question

Which of the following method returns the sine of 90 degree? Math.sine(90) Math.sin(90) Math.sin(PI) Math.sin(Math.toRadian(90)) Math.sin(Math.PI)

answer

Math.sin(Math.toRadian(90))

question

Which of the following is the correct expression of character 4? 4 "4" '004' '4'

answer

'4'

question

Which of the following is a possible output for (int)(51 * Math.random())? 0 50 100 500

answer

0 50

question

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

answer

an empty string

question

What is Math.round(3.6)?

answer

4

question

What is Math.floor(3.6)?

answer

3.0

question

What is Math.ceil(3.6)?

answer

4.0

question

What is "Welcome" + 1 + 1 * 2?

answer

Welcome12

question

To concatenate s1, s2, s3, and s4, you write ________. s1.concate(s2).concate(s3).concate(s4); s1.concate(s2) + s3.concate(s4); ((s1.concate(s2)).concate(s3)).concate(s4); s1.concate(s2).(concate(s3).concate(s4));

answer

s1.concate(s2).concate(s3).concate(s4); s1.concate(s2) + s3.concate(s4); ((s1.concate(s2)).concate(s3)).concate(s4);

question

Math.ceil(5.5) evaluates to ________.

answer

6.0

question

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

answer

A1

question

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

answer

**Sorry lost answer**

question

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

answer

c

question

You compare two strings s1 and s2 using ________. compare(s1, s2) s1.compare(s2) compareTo(s1, s2) s1.compareTo(s2)

answer

s1.compareTo(s2)

question

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

answer

char c = '5';

question

The statement System.out.printf("%5d", 123456) outputs ________.

answer

123456

question

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

answer

****123456

question

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.

answer

(C) i is an integer, but the format specifier %5.1f specifies a format for double value. The code has an error.

question

What does the following code output? double price = 19.8; System.out.printf("$%6.2f each", price);

answer

$ 19.80 each

question

After a program executes String name = "Mary, Mary quite contrary"; name.indexOf("Mary", 1); returns ______

answer

6

question

What will be the result of the given code? String s = "StudyTonight"; s+= ".com"; s = s.toUpperCase(); 1. STUDYTONIGHT 2. STUDYTONIGHT.COM 3. studytonight 4. studytonight.com

answer

2. STUDYTONIGHT.COM

question

Which method is used to determine the number of characters in a String object? 1. length() 2. numChars() 3. getLength() 4. None of the above

answer

1. length()

question

To read a string from the console, invoke the[x]() method on a [y] object.

answer

x: next y: Scanner

question

You can use the _____() method to read an entire line of text.

answer

nextLine

question

Strings are ______ in Java.

answer

objects

question

A [x] is a sequence of characters. It is enclosed in matching double quotes ("). A [y] value is enclosed in matching single quotes (').

answer

x: string y: char

question

A break statement can be used only in a loop.

answer

false

question

A continue statement can be used only in a loop.

answer

true

question

A variable declared in the for loop control can be used after the loop exits.

answer

false

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