CS4A Ch.1
Which of the following code has the best style? https://snag.gy/jZC4fV.jpg I II III IV
IV
________ is a program that runs on a computer to manage and control a computer's activities.
Operating system
Which of the following are the reserved words?(Multi) public static void class
public static void class
The extension name of a Java bytecode file is ________. .java .obj .class .exe
.class
__________ translates high-level language program into machine language program.
A compiler
A Java application must have a main method. True False
True
A Java program block starts with an open brace ({) and ends with a closing brace (}). True False
True
Java source code can be executed on a Java Virtual Machine. true false
false
You use ________ to run a Java program.
java
Computer can execute the code in ________. machine language assembly language high-level language None of these
machine language
The _________ must be the same as the filename that contains the class.
public classname
Which of the following lines is not a Java comment? (multi) /*** comments */ // comments -- comments /** comments **/ *** comments ***
-- comments *** comments ***
Why do computers use zeros and ones? -because combinations of zeros and ones can represent any numbers and characters. -because digital devices have two stable states and it is natural to use one state for 0 and the other for 1. -because binary numbers are simplest. -because binary numbers are the bases upon which all other number systems are built.
-because digital devices have two stable states and it is natural to use one state for 0 and the other for 1.
Programming style is important, because ________. (multiptle) -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
-good programming style makes a program more readable -good programming style helps reduce programming errors...
The extension name of a Java source code file is ________. .java .obj .class .exe
.java
Four bytes have ________ bits. 8 16 32 64
32
One byte has ________ bits. 4 8 12 16
8
https://snag.gy/eN4VCI.jpg Both I and II can compile and run and display Welcome to Java, but the code in II has a better style than I. Only the code in I can compile and run and display Welcome to Java. Only the code in II can compile and run and display Welcome to Java. Both I and II can compile and run and display Welcome to Java, but the code in I has a better style than II.
Both I and II can compile and run and display Welcome to Java, but the code in I has a better style than II.
________ contains predefined classes and interfaces for developing Java programs.
Java API
________ consists of a set of separate programs for developing and testing Java programs, each of which is invoked from a command line.
Java JDK
Java compiler translates Java source code into ________.
Java bytecode
A ________ is a program that translates Java source code into Java bytecode.
Java interpreter
________ is a software that interprets Java bytecode.
Java virtual machine
________ are instructions to the computer. (multi) Hardware Software Programs Keyboards
Software Programs
Which of the following statements is correct to display Welcome to Java on the console? (multi) System.out.println('Welcome to Java'); System.out.println("Welcome to Java"); System.println('Welcome to Java'); System.out.print('Welcome to Java'); System.out.print("Welcome to Java");
System.out.println("Welcome to Java"); System.out.print("Welcome to Java");
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 ________. Test.class Test.doc Test.txt Test.java Any name with extension .java
Test.java
If you forget to put a closing quotation mark on a string, what kind error will be raised? a compilation error a runtime error a logic error
a compilation error
If a program compiles fine, but it produces incorrect result, then the program suffers ________ a compilation error a runtime error a logic error
a logic error
Every statement in Java ends with ________. a semicolon (;) a comma (,) a period (.) an asterisk (*)
a semicolon (;)
A block is enclosed inside ________. parentheses braces brackets quotes
braces
The ________ loads Java bytecode to the memory. Java virtual machine bytecode verifier class loader Java compiler
class loader
The compiler generates bytecode even if the program has syntax errors. true false
false
The keywords in Java are all in lowercase. true false
false
Which JDK command is correct to run a Java application in ByteCode.class? java ByteCode java ByteCode.class javac ByteCode.java javac ByteCode JAVAC ByteCode
java ByteCode
type in the JDK command to compile the class MyFirstProgram.
javac MyFirstProgram.java
The JDK command to compile a class in the file Test.java is ________. java Test java Test.java javac Test.java javac Test JAVAC Test.java
javac Test.java
The command to compile a class in the file Test.java is ________. java Test java Test.java javac Test.java javac Test JAVAC Test.java
javac Test.java
The main method header is written as ________. public static void main(string[] args) public static void Main(String[] args) public static void main(String[] args) public static main(String[] args) public void main(String[] args)
public static void main(String[] args)
Java is an object-oriented programming language. true false
true
