QUESTION 1 A static variable of a class cannot be changed. True False 2 points Q

Question

QUESTION 1

A static variable of a class cannot be changed.

True

False

2 points   

QUESTION 2

A .java file may have any number of public classes.

True

False

2 points   

QUESTION 3

The following statement correctly creates a Scanner object for user input from the keyboard.

Scanner kb = new Scanner(System.keyboard);

True

False

2 points   

QUESTION 4

A class is an instance of an object.

True

False

2 points   

QUESTION 5

A class can have any number of constructors.

True

False

2 points   

QUESTION 6

The functions or data members declared private in a class can only be accessed only through definition those functions declared in that class.

True

False

2 points   

QUESTION 7

You can write a class that is useful with all its methods and variables declared private.

True

False

2 points   

QUESTION 8

A class member that is to be shared among all objects of a class is called

A final member

A reference member

A static member

A value member

3 points   

QUESTION 9

What will be the output of the following code fragment?

{

   System.out.println("result = " + 1 + 4);

}

result = 5

result = 14

result = 0

result = null

3 points   

QUESTION 10

When saving a Java source file, save it with the extension of

.java

.javac

.class

.src

3 points   

QUESTION 11

A file with the .class extension means that the file:

Contains Java source code.

Contains HTML.

was produced by the Java compiler.

was produced by the Java interpreter.

3 points   

QUESTION 12

Which of the following are correct?

A constructor must be declared with a return type

A constructor must be declared for each class.

A class can have only one default constructor.

A default constructor can only be provided by the java compiler.

3 points   

QUESTION 13

Which keyword do we use to specify a constant variable ? (one the does not change after the initial assignment)

const

constant

final

fixed

3 points   

QUESTION 14

Which Java package includes the Scanner class?

awt

swing

util

lang

3 points   

QUESTION 15

Which of the following statements is used to terminate the current interation of the loop, and go on the next interation of the loop?

break;

continue;

switch

if .... else .... ;

3 points   

QUESTION 16

What does the following Boolean expression evaluate to?

(!(5 < 3))

unknown

true

false

null

A final member

A reference member

A static member

A value member

Explanation / Answer

Answer 1:

false. Static variable can be changed. Static means the variable is tied directly to the class, not an object.

Answer 2 :

true. It can have multiple public classes. But when you run the file, the name of the file must match one class.

Answer 3 :

false. It should be system.in, not system.keyboard

Answer:

4 is false. An object is an instance of a class. Not class is an instance of an object.

Answer :

5 is true. A class can have many constructors, as long as there is no conflict.

Answer :

6 is true.

Answer:

7 is true I think. You can keep everything private, if you have a main function and you are only running the same class file.

8)

A static Member , 8, there is no such thing as reference or value member. Final member means the variable cannot be changed. But not necessarily mean it is shared. Static means it is shared, because it is tied to the class, not the object.

9) the compiler reads from left to right. So the left element is string, "result =". So it will treat everything else as string, including 1 and 4, and will perform string concatenation making it 14. If you put a bracket around 1+4, then only it will print 5.

For 10 and 11, the interpreter, which is us, writes the java code first and save it in a .class file. Then in command prompt, we use the command javac. Once we use that command, the compiler reads the .class file and translate into .java file which the computer understands. Then you use the "java" command to make the computer run the file.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.