Java Springs Online Exams model Test3

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1.Consider the following program: import myLibrary.*; public class ShowSomeClass { // code for the class... } What is the name of the java file containing this program?
myLibrary.java	ShowSomeClass.java
ShowSomeClass	ShowSomeClass.class

2.Which of the following is True?
In java, an instance field declared public generates a compilation error	int is the name of a class available in the package java.lang
Instance variable names may only contain letters and digits	A class has always a constructor (possibly automatically supplied by the java compiler)

3.Consider the following code snippet String river = new String(“Columbia”); System.out.println(river.length()); What is printed?
6	7
8	Columbia

4. A constructor ______.
must have the same name as the class it is declared within	is used to create objects
may be declared private	Both of the above

5.Which of the following may be part of a class definition?
instance variables	instance methods
constructors	All of the above

6.What is different between a Java applet and a Java application?
An application can in general be trusted whereas an applet can't	An applet must be executed in a browser environment
An applet is not able to access the files of the computer it runs on	All of the above

7.Consider public class MyClass{ public MyClass(){/*code*/} // more code... } To instantiate MyClass, you would write?
MyClass mc = new MyClass();	MyClass mc = MyClass();
MyClass mc = MyClass;	MyClass mc = new MyClass;

8.What is byte code in the context of Java?
The type of code generated by a Java compiler	The type of code generated by a Java Virtual Machine
It is another name for a Java source file	It is the code written within the instance methods of a class

9.What is garbage collection in the context of Java?
The operating system periodically deletes all of the java files available on the system	Any package imported in a program and not used is automatically deleted
When all references to an object are gone, the memory used by the object is automatically reclaimed	The JVM checks the output of any Java program and deletes anything that doesn't make sense

10.You read the following statement in a Java program that compiles and executes. submarine.dive(depth); What can you say for sure?
depth must be an int	dive must be a method
dive must be the name of an instance field	submarine must be the name of a class

11.Formed on a diskette (or hard drive) during initialization.
source code	images
sectors	storage units

12.The CPU consists of:
Control Unit, Temporary Memory, Output	Control Unit, Arithmetic Logic Unit, Temporary Memory
Input, Process, Storage, Output	Input, Control Unit, Arithmetic Logic Unit, Output

13.OOP stands for:
Observable Object Programming	Object Observed Procedures
Object Oriented Programming	Object Overloading Practices

14.Output printed on paper.
softcopy	hardcopy
source code	software

15.A binary digit (1 or 0) signifying "on" or "off".
bit	byte
megabyte	gigabyte

16.Our decimal number 44, when represented in binary, is:
101100	101010
111000	10100

17.Byte code is the machine language for a hypothetical computer called the:
Server Side Program	static Program
simple Program	none

18.Java allows for three forms of commenting:
// single line, ** block lines, /*/ documentation	// single line, /*...*/ block lines, /**...*/ documentation
/ single line, /* block lines, ** documentation	// single line, //...// block lines, //*...*// documentation

19.Equals 8 bits.
megabyte	gigabyte
sector	byte

20.To prepare a diskette (or hard drive) to receive information.
format	track
interpret	boot