1. Java is the fastest growing programming language in the world.

Transcription

1 Chapter 2 First Java Programs TRUE/FALSE 1. Java is the fastest growing programming language in the world. T PTS: 1 REF: Java programs cannot be run on different types of computers unless code changes are made. F 3. Compared to C++, Java is more difficult to use and learn, more error prone, and less portable. F 4. A JVM is a program that behaves like a computer. T 5. Any computer can run an interpreter. T PTS: 1 REF: Java applets are inherently insecure. F PTS: 1 REF: Terminal-oriented programs are similar in structure to programs that process files of sequentially organized data. T PTS: 1 REF: Sending messages to objects always takes the form <name of object>(<parameters>). T PTS: 1 REF: Java programs cannot be written using a simple text editor, such as Notepad. F PTS: 1 REF: When a syntax error is found by the Java compiler, the error message that is provided yields no information about the type of error that occurred or where it occurred. F PTS: 1 REF: The main factor affecting a program s readability is its layout. T PTS: 1 REF: During the course of a program, a variable s value cannot change.

2 F PTS: 1 REF: It is required that variable names begin with a lowercase letter. F PTS: 1 REF: There is a limit to the number of variables that you can declare in a program. F PTS: 1 REF: The default layout manager for frames is an instance of the class BorderLayout. T PTS: 1 REF: 49 MULTIPLE CHOICE 1. Java is a modern programming language. a. first-generation c. procedural b. object-oriented d. second-generation B 2. Java bears a superficial resemblance to, which is currently the world s most popular industrial-strength programming language. a. C c. COBOL b. BASIC d. C++ D 3. The Java compiler translates Java into. a. natural language c. byte code b. machine language d. bit code C 4. A(n) user interface uses the Java console and the command prompt to display data, prompt the user for data, and read data into a program. a. terminal I/O c. graphical b. text d. illustrative A PTS: 1 REF: is the name of an object that knows how to display or print characters in a terminal window. a. System c. System.out b. System.terminal d. Out.System C PTS: 1 REF: The end of a statement in a Java program is denoted by a. a. : c. ; b.. d. } C PTS: 1 REF: Which of the following Java statements would print the text Hello in a terminal window?

3 a. System.println( Hello ); c. System.printLine( Hello ); b. System.out.println(Hello); d. System.out.println( Hello ); D PTS: 1 REF: The file extension for a Java source code file must be. a..java c..jav b..j d..sun A PTS: 1 REF: The file extension for a byte code file is always. a..cla c..java b..class d..jav B PTS: 1 REF: Using a simple text editor in Windows to write Java programs, plus running the Java compiler and the JVM from the command line in Windows is known as the development environment. a. simple c. integrated b. DOS d. Windows B PTS: 1 REF: A(n) statement, found at the beginning of a Java source code file, tells the compiler where to find complete specifications for a class that will be used in the Java source code. a. include c. use b. export d. import D PTS: 1 REF: In general, instantiation takes the form. a. SomeClass someobject = new SomeClass(some parameters); b. SomeClass someobject = SomeClass(some parameters); c. someobject = new SomeClass(some parameters); d. SomeClass = new SomeClass(some parameters); A PTS: 1 REF: The assignment operator is represented in Java by the symbol. a. > c. == b. = d.!= B PTS: 1 REF: The multiplication operator is represented in Java by the symbol. a. x c. * b. / d. % C PTS: 1 REF: The code for application windows in Java is located in the class. a. JApp c. JWindow b. JFrame d. WindowFrame B PTS: 1 REF: 47

4 COMPLETION 1. Java is secure, robust, and. portable 2. A(n) is a process that can run concurrently with other processes. thread 3. Java runs more slowly than most modern programming languages because it is. interpreted 4. To run Java byte code on a particular computer, you must install a(n) unless it comes with the operating system. Java virtual machine (JVM) Java virtual machine JVM 5. Some JVMs translate byte code instructions into machine language when they are first encountered, which is a process called. just-in-time compilation (JIT) just-in-time compilation JIT A(n) is a sequence of instructions for a computer. program PTS: 1 REF: The string of characters that appears between the parentheses following a System.out.println message is called a(n). parameter

5 PTS: 1 REF: When sending a message to an object, the period between the object s name and the message s name is called a(n). method selector operator PTS: 1 REF: Metrowerks Code Warrior, Microsoft s Visual J++, and Borland s JBuilder are examples of. integrated development environments (IDEs) integrated development environments IDEs PTS: 1 REF: To compile a Java program stored in the file Hello.java from the command line, you would use the command. javac Hello.java PTS: 1 REF: Once the Java program contained in the file Hello.java has been compiled, you can run it from the command line using the command. java Hello PTS: 1 REF: Mistakes detected by the compiler are called. syntax errors compile-time errors PTS: 1 REF: are used to share information between objects. Parameters PTS: 1 REF: A numeric names a location in RAM in which a number can be stored. variable PTS: 1 REF: 43

6 15. Variables of type double are used to store numbers. floating-point PTS: 1 REF: Statements utilizing an assignment operator are called statements. assignment PTS: 1 REF: In Java, as in algebra, multiplication and division are done before addition and subtraction unless are used to change the order of the computations. parentheses PTS: 1 REF: After the statement Scanner reader = new Scanner(System.in); has been executed in a program, the variable reader stores a(n) to a Scanner object. reference PTS: 1 REF: A(n) is a flat, rectangular area suitable for displaying other objects, such as geometric shapes and images. panel PTS: 1 REF: In Java, each container object, such as a frame or a panel, uses an object called a(n) to coordinate the organization and layout of items within the container. layout manager PTS: 1 REF: 49