Programming Java Chapter 2
If you wish to use the System.out.printf method to print a string argument, use the ___ format specifier
%s
Which of the following is not a valid Java comment?
*/ Comment /*
Which of the following is not a valid comment statement? -// comment 1 -/* comment 2 */ -*/ comment 3 /* -/** comment 4 */
-*/ comment 3 /*
When saving a Java source file, save it with an extension of
.java
In Java, the beginning of a comment is marked with: - // - "" - ; - #
//
What is the result of the following expression? 10 + 5 * 3 - 20
5
What will be the value of z as a result of executing the following code? int x = 5, y = 28; float z; z = (float) (y / x);
5.0
What will be the value of z as a result of executing the following code? int x=5, y=28; float z; z=(float)(y/x);
5.0
What is the result of the following expression? 25 / 4 + 4 * 10 % 3
7
What is the result of the following expression? 17 % 3 * 2 - 12 + 15 -7 -8 -12 -105
7
What is the result of the following expression? 25 - 7 * 3 + 12 / 3 6 8 10 12
8
What will be the value of z after the following statements have been executed? int x=4, y=33; double z; z=(double)(y/x);
8.0
A Java program must have at least one -Class definition -Variable -Comment -System.out.println(); statement
Class definition
In Java, it is standard practice to capitalize the first letter of: -Class names -Variable names -Key words -Literals
Class names
Variables are classified according to their
Data type
Which one of the following would contain the translated Java byte code for a program named Demo? -Demo.java -Demo.code -Demo.class -Demo.byte
Demo.class
Variables of the boolean data type are useful for
Evaluating conditions that are either true or false
Both character literals and string literals can be assigned to a char variable
False
Which of the following is not a rule that must be followed when naming identifiers? -The first character must be one of the letters a-z, A-Z, and underscore or a dollar sign. -Identifiers can contain spaces. -Uppercase and lowercase characters are distinct. -After the first character, you may use the letters a-z, A-Z, the underscore, a dollar sign, or digits 0-9.
Identifiers can contain spaces
Which of the following cannot be used as identifiers in Java? -Variable names -Class names -Key words -All of the above -None of the above
Key words
This is a value that is written into the code of a program -literal -assignment statement -variable -operator
Literal
What will be displayed as a result of executing the following code? public class test { public static void main(String[] args) { int value1 = 9; System.out.println(value1); int value2 = 45; System.out.println(value2); System.out.println(value3); value = 16; } }
Nothing, this is an error
What will be the displayed when the following code is executed? final int x = 22, y = 4; y += x; System.out.println("x = " + x + ", y = " + y);
Nothing, this is an error
What will be displayed when the following code is executed? final int x = 22, y= 4; y += x; System.out.println ("x = " + x + "y = " + y);
Nothing. There is an error in the code
What would be printed out as a result of the following code? System.out.println("The quick brown fox" + "jumped over the \n" "slow moving hen."); -The quick brown fox jumped over the \nslow moving hen. -The quick brown fox jumped over the slow moving hen. -The quick brown fox jumped over the slow moving hen. -Nothing. This is an error.
Nothing. This is an error.
Character literals are enclosed in ___, and string literals are enclosed in ____
Single quotes, double quotes
The term ___________ typically refers to the device that displays console output. -Standard output device -Central processing unit -Secondary storage device -Liquid crystal display
Standard output device
Which of the following is not a primitive data type? -short -long -float -String
String
When the + operator is used with strings, it is known as the: -Assignment operator -String concatenation operator -Addition operator -Combined assignment operator
String concatenation operator
To print "Hello, world" on the monitor, use the following Java statement -SystemOutPrintln("Hello, world"); -System.out.println{"Hello, world"} -System.out.println("Hello, world"); -Print "Hello, world";
System.out.println("Hello, world");
In the following Java statement what value is stored in the variable name? String name="John Doe";
The memory address where "John Doe" is located
If the following Java statements are executed, what will be displayed? System.out.println("The top three winners are\n"); System.out.print("Jody, the Giant\n"); System.out.print("Buffy, the Barbarian"); System.out.println("Adelle, the Alligator"); -The top three winners are Jody, the Giant Buffy, the Barbarian Adelle, the Alligator -The top three winners are Jody, the Giant\nBuffy, the BarbarianAdelle, the Alligator -The top three winners are Jody, the Giant\nBuffy, the BarbarianAdelle, and the Albino -The top three winners are Jody, the Giant Buffy, the BarbarianAdelle, the Alligator
The top three winners are Jody, the Giant Buffy, the BarbarianAdelle, the Alligator
What would be displayed as a result of the following code? int x = 578; System.out.print("There are " + x + 5 + "\n" + "hens in the hen house.");
There are 5785 hens in the hen house
Named constants are initialized with a value and that value cannot change during the execution of the program: True or False
True
The System.out.printf method allows you to format output in a variety of ways
True
When you call one of the Scanner class's methods to read a primitive value, such as nextInt or nextDouble and then call the nextLine method to read a string, an annoying and hard-to-find problem can occur
True
The primitive data types only allow a(n) ___ to hold a single value
Variable
This is a named storage location in the computer's memory
Variable
This is a named storage location in the computer's memory. -Literal -Constant -Variable -Operator
Variable
In Java, ___________ must be declared before they can be used. -Variables -Literals -Key words -Comments
Variables
The simplest way you can use the System.out.printf method is
With only a format string, and no additional arguments
Which of the following statements will correctly convert the data type if x is a float and y is a double?
X=(float)y;
To display the output on the next line, you can use the println method or use this escape sequence in the print method.
\n
Every Java application program must have -a class named MAIN -a method named main -comments -integer variables
a method named main
Which of the following statements is invalid?
double r = 2.9X106;
Variables of the boolean data type are useful for -working with small integers -evaluating true/false conditions -working with very large integers -evaluating scientific notation
evaluating true/false conditions
Which of the following is valid? -float y; y = 54.9; -float y; double z; z = 934.21; y = z; -float w; w = 1.0f; -float v; v = 1.0;
float w; w = 1.0f;
To compile a program named First, use the following command: -java First.java -javac First -javac First.java -compile First.javac
javac First.java
Given the declaration double r;, which of the following statements is invalid? r = 326.75;b. r = 9.4632e15; r = 9.4632E15; r = 2.9X106;
r = 2.9X106;
The boolean data type may contain values in the following range of values true or false -128 to + 127 - 2,147,483,648 to +2,147,483,64. - 32,768 to +32,767
true or false
If x has been declared an int, which of the following statements is invalid? x = 0; x = -58932; x = 1,000; x = 592;
x = 1,000;
What will be displayed as a result of executing the following code? int x = 5, y = 20; x += 32; y /= 4; System.out.println("x = " + x + ", y = " + y); -x = 32, y = 4 -x = 9, y = 52 -x = 37, y = 5 -x = 160, y = 80
x = 37, y = 5
What output will be displayed as a result of executing the following code? int x =5, y = 20; x+= 32; y/=4; System.out.println("x=" + x + ", y=" +y);
x=37,y=5
