Ch. 2 - Java Fundamentals

Character literals are enclosed in _____; string literals are enclosed in _____.

Single quotes; Double quotes

Given the declaration double r;, which of the following statements is invalid?

r = 2.9X106;

A Java program must have at least one of these:

Class definition

In Java, it is standard practice to capitalize the first letter of:

Class names

Which of the following is NOT a rule that must be followed when naming identifiers?

Identifiers can contain spaces.

Which of the following cannot be used as identifiers in Java?

Key words

This is a value that is written into the code of a program

Literal

Which of the following does NOT describe a valid comment in Java?

Multi-line comments, start with **/ and end with /**

This is a variable whose content is read only and cannot be changed during the program's execution.

Named constant

Which of the following statements correctly creates a Scanner object for keyboard input?

Scanner keyboard = new Scanner(System.in);

The term ___________ typically refers to the device that displays console output.

Standard output device

Which of the following is not a primitive data type?

String

When the (+) operator is used with strings, it is known as the:

String concatenation operator

Which of the following is a valid Java statement?

String str = "John Doe";

To print "Hello, world" on the monitor, use the following Java statement:

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

TRUE/FALSE: A variable's scope is the part of the program that has access to the variable.

True

TRUE/FALSE: Although the dollar sign is a legal identifier character, you should not use it because it is normally used for special purposes.

True

TRUE/FALSE: If the compiler encounters a statement that uses a variable before the variable is declared, an error will result.

True

TRUE/FALSE: Named constants are initialized with a value, that value cannot be changed during the execution of the program.

True

TRUE/FALSE: Programming style includes techniques for consistently putting spaces and indentation in a program so visual cues are created.

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

In Java, ___________ must be declared before they can be used.

Variables

Which of the following is not a valid comment statement?

**/ 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:

//

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 method named "main"

What is the result of the following expression? 10 + 5 * 3 - 20

5

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.class

Which one of the following methods would you use to convert a string to a double?

Double.ParseDouble

Variables of the boolean data type are useful for:

Evaluating true/false conditions

TRUE/FALSE: A Java program will not compile unless it contains the correct line numbers.

False

TRUE/FALSE: All Java statements end with semicolons.

False

TRUE/FALSE: Assuming that pay has been declared a double, the following statement is valid. pay = 2,583.44;

False

TRUE/FALSE: Both character literals and string literals can be assigned to a char variable.

False

TRUE/FALSE: Class names and key words are examples of variables.

False

TRUE/FALSE: In Java the variable named total is the same as the variable named Total.

False

TRUE/FALSE: Java is a case-insensitive language.

False

The boolean data type may contain values in the following range of values:

True or False

Which of the following is valid?

float w; w = 1.0*f*;

To compile a program named First, use the following command:

javac First.java

Which Scanner class method reads an int?

nextInt()

Which Scanner class method reads a String?

nextLine()

If x has been declared an int, which of the following statements is invalid?

x = 1,000; *NO COMMAS!*

What is the result of the following expression? 17 % 3 * 2 - 12 + 15

7

What is the result of the following expression? 25 / 4 + 4 * 10 % 3

7

What is the result of the following expression? 25 - 7 * 3 + 12 / 3

8