Chapter 1 Introduction to Computers, Programs, and Java
Section 1.2 What is a Computer?
1. is the physical aspect of the computer that can be seen.
a. Hardware
b. Software
c. Operating system
d. Application program
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Section 1.2.1 What is a Computer?
2. is the brain of a computer.
a. Hardware
b. CPU
c. Memory
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3. The speed of the CPU may be measured in .
a. megabytes
b. gigabytes
c. megahertz
d. gigahertz
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Section 1.2.2 Bits and Bytes
4. Why do computers use zeros and ones?
a. because combinations of zeros and ones can represent any numbers and characters.
b. because digital devices have two stable states and it is natural to use one state for 0 and the other for 1.
c. because binary numbers are simplest.
d. because binary numbers are the bases upon which all other number systems are built.
5. One byte has bits.
a. 4
b. 8
c. 12
d. 16
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5. One gigabyte is approximately bytes.
a. 1 million
b. 10 million
c. 1 billion
d. 1 trillion
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6. A program and its data must be moved into the computer’s before they can be executed by the CPU.
a. memory
b. hard disk
c. CPU
d. CD–ROM
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Section 1.2.4 Storage Devices
6. A computer’s is volatile; that is, any information stored in it is lost when the system’s power is turned off.
a. memory
b. hard disk
c. flash stick
d. CD–ROM
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6. Which of the following are storage devices?
a. portable disk
b. hard disk
c. flash stick
d. CD–ROM
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Section 1.2.5 Input and Output Devices
7. The specifies the number of pixels in horizontal and vertical dimensions of the display device.
a. screen resolution
b. pixel
c. dot pitch
d. monitor
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Section 1.2.6 Communications Devices
7. is a device to connect a computer to a local area network (LAN).
a. Regular modem
b. DSL
c. Cable modem
d. NIC
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Section 1.3 Program Languages
8. are instructions to the computer.
a. Hardware
b. Software
c. Programs
d. Keyboards
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9. Computer can execute the code in .
a. machine language
b. assembly language
c. high–level language
d. none of the above
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10. translates high–level language program into machine language program.
a. An assembler
b. A compiler
c. CPU
d. The operating system
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Section 1.4 Operating Systems
11. is an operating system.
a. Java
b. C++
c. Windows
d. Visual Basic
e. Ada
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12. is a program that runs on a computer to manage and control a computer’s activities.
a. Operating system
b. Java
c. Modem
d. Interpreter
e. Compiler
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Section 1.5 Java, World Wide Web, and Beyond
14. Due to security reasons, Java cannot run from a Web browser in the new version of Java.
a. applications
b. applets
c. servlets
d. Micro Edition programs
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15.
a. Java
b. C++
c. C
d. C#
e. Python
is not an object–oriented programming language.
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16.
is interpreted.
a. Java
b. C++
c. C
d. Ada
e. Pascal
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17.
a. Java
b. C++
c. C
d. Ada
e. Pascal
is architecture–neutral.
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Section 1.6 The Java Language Specification, API, JDK, and IDE
18.
language. is a technical definition of the language that includes the syntax and semantics of the Java programming
a. Java language specification
b. Java API
c. Java JDK
d. Java IDE
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19. contains predefined classes and interfaces for developing Java programs.
a. Java language specification
b. Java API
c. Java JDK
d. Java IDE
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20. consists of a set of separate programs for developing and testing Java programs, each of which is
invoked from a command line.
a. Java language specification
b. Java API
c. Java JDK
d. Java IDE
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21.
provides an integrated development environment (IDE) for rapidly developing Java programs. Editing,
compiling, building, debugging, and online help are integrated in one graphical user interface.
a. Java language specification
b. Java API
c. Java JDK
d. Java IDE
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Section 1.7 A Simple Java Program
22. The main method header is written as:
a. public static void main(string[] args)
b. public static void Main(String[] args)
c. public static void main(String[] args)
d. public static main(String[] args)
e. public void main(String[] args)
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23. Which of the following statements is correct?
a. Every line in a program must end with a semicolon.
b. Every statement in a program must end with a semicolon.
c. Every comment line must end with a semicolon.
d. Every method must end with a semicolon.
e. Every class must end with a semicolon.
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24. Which of the following statements is correct to display Welcome to Java on the console?
a. System.out.println(‘Welcome to Java’);
b. System.out.println(“Welcome to Java”);
c. System.println(‘Welcome to Java’);
d. System.out.println(‘Welcome to Java”);
e. System.out.println(“Welcome to Java’);
Section 1.8 Creating, Compiling, and Executing a Java Program
25. The JDK command to just compile a class (not run) in the file Test.java is
a. java Test
b. java Test.java
c. javac Test.java
d. javac Test
e. JAVAC Test.java
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26. Which JDK command is correct to run a Java application in ByteCode.class?
a. java ByteCode
b. java ByteCode.class
c. javac ByteCode.java
d. javac ByteCode
e. JAVAC ByteCode
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27. Java compiler translates Java source code into .
a. Java bytecode
b. machine code
c. assembly code
d. another high–level language code
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28. is a software that interprets Java bytecode.
a. Java virtual machine
b. Java compiler
c. Java debugger
d. Java API
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29. Suppose you define a Java class as follows, the source code should be stored in a file named .
public class Test {
}
a. Test.class
b. Test.doc
c. Test.txt
d. Test.java
e. Any name with extension .java
30. The extension name of a Java bytecode file is
a. .java
b. .obj
c. .class
d. .exe
31. The extension name of a Java source code file is
a. .java
b. .obj
c. .class
d. .exe
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32. Which of the following lines is not a Java comment?
a. /** comments */
b. // comments
c. –– comments
d. /* comments */
e. ** comments **
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33. Which of the following are the reserved words?
a. public
b. static
c. void
d. class
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34. Every statement in Java ends with .
a. a semicolon (;)
b. a comma (,)
c. a period (.)
d. an asterisk (*)
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35. A block is enclosed inside .
a. parentheses
b. braces
c. brackets
d. quotes
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Section 1.9 Programming Style and Documentation
36. Programming style is important, because .
a. a program may not compile if it has a bad style
b. good programming style can make a program run faster
c. good programming style makes a program more readable
d. good programming style helps reduce programming errors
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37. Analyze the following code.
I:
public class Test {
public static void main(String[] args) {
System.out.println(“Welcome to Java!”);
}
}
II:
public class Test { public static void main(String[] args) {
System.out.println(“Welcome to Java!”); } }
a. Both I and II can compile and run and display Welcome to Java, but the code in II has a better style than I.
b. Only the code in I can compile and run and display Welcome to Java.
c. Only the code in II can compile and run and display Welcome to Java.
d. Both I and II can compile and run and display Welcome to Java, but the code in I has a better style than II.
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38. Which of the following code has the best style?
I:
public class Test {
public static void main(String[] args) {
System.out.println(“Welcome to Java!”);
}
}
II:
public class Test {
public static void main(String[] args) {
System.out.println(“Welcome to Java!”);
}
}
III:
public class Test {
public static void main(String[] args) {
System.out.println(“Welcome to Java!”);
}
}
IV:
public class Test {
public static void main(String[] args) {
System.out.println(“Welcome to Java!”);
}
}
a. I
b. II
c. III
d. IV
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Section 1.10 Programming Errors
39. If a program compiles fine, but it produces incorrect result, then the program suffers .
a. a compile error
b. a runtime error
c. a logic error
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40. If you forget to put a closing quotation mark on a string, what kind of error will be raised?
a. a compile error
b. a runtime error
c. a logic error