Question 1 When a method returns an array reference, you include ____ with the r

Question

Question 1  

When a method returns an array reference, you include ____ with the return type in the method header.

a.   { }

b.   ( )

c.   < >

d.   [ ]

Question 2  

Assuming a variable w has been assigned the value 15, what does the following statement do? w==15 ? x=2: x=0

a)   assigns 2 to x

b)   assigns 15 to w

c)   assigns 0 to x

d)   nothing

Question 3  

Each of the following is a relational or equality operator except:

a.   <=

b.   =!

c.   ==

d.   >

Question 4  

A method is declared as public static void showResults(double d, int i). Which of the following is a correct method call?

a)   showResult(double d, int i)

b)   showResult(4, 99.7)

c)   showResult(12.2, 67)

d)   showResult(12.2, 99.7)

Question 5  

The ____ statement is useful when you need to test a single variable against a series of exact integer, character, or string values.

a)   switch

b)   if

c)   else

d)   break

Question 6  

What is the output of the following Java code?

int x = 0 if (x > 0)

System.out.println("positive ") System.out.println("zero ")

System.out.println("negative")

a)   zero

b)   negative

c)   zero negative

d)   positive zero negative

Question 7  

When any ____ type (boolean, char, byte, short, int, long, float, or double) is passed to a method, the value is passed.

a)   array

b)   dummy

c)   element

d)   primitive

Question 8  

Which of the following statements are true about constructors of a class? (Choose all that apply)

a)   You can only define one constructor.

b)   Constructors do not have a return type.

c)   Constructors must have the same name as the class itself.

d)   Constructors are invoked using the new operator when an object is created.

Question 9  

Which of the following are correct names for variables according to Java naming conventions? (Choose all that apply)

a)   radius

b)   Radius

c)   RADIUS

d)   findArea

Question 10  

A variable defined inside a method is referred to as __________.

a)   a global variable

b)   a method variable

c)   a block variable

d)   a local variable

Question 11  

public static char methodHeading(int n, double num)

Which of the following statements about the method heading in the accompanying figure is NOT true?

a)   The method has two parameters.

b)   The method cannot be used outside the class.

c)   methodHeading is an identifier giving a name to this specific method.

d)   It is a value­returning method of type char.

Question 12  

A(n) ____ method is a method that creates and initializes class objects.

a)   constructor

b)   accessor

c)   non­static

d)   instance

Question 13  

Which of the following is incorrect? (Choose All that apply)

a)   int[] a = new int[2]

b)   int a() = new int[2]

c)   int[] a = new int(2)

d)   int a = new int[2]

Question 14  

The ____ requires three expressions separated with a question mark and a colon.

a)   flowchart

b)   conditional operator

c)   sequence structure

d)   conditional statement

Question 15  

Which of the following is NOT true about return statements?

a)   A value­returning method returns its value via the return statement.

b)   return statements can be used in void methods to return values.

c)   A method can have more than one return statement.

d)   Whenever a return statement executes in a method, the remaining statements are skipped and the method exits.

Question 16  

Calling a method has the ability to take many forms is called ________.

a)   inheritance

b)   polymorphism

c)   encapsulation

d)   abstraction

Question 17  

Which method contains the code that the program executes when a specific event is generated?

a)   buttonListener

b)   GUIListener

c)   actionPerformed

d)   windowListener

Question 18  

Any of the file input or output methods in a Java program might throw an exception, so all the relevant code in the class is placed in a ____ block.

a)   finally

b)   throw

c)   try

d)   catch

Question 19  

The JCheckBox, JComboBox, and JRadioButton components are associated with the ____ method.

a)   addAdjustmentListener()

b)   addChangeListener()

c)   addWindowListener()

d)   addItemListener()

Question 20  

Inheritance is an example of what type of relationship?

a)   is­a

b)   has­a

c)   was­a

d)   had­a

Explanation / Answer

Answers:

1)d. [ ]

2)a) assigns 2 to x

3) All are correct

4)c) showResult(12.2, 67)

5)a) switch

6)c) zero negative

7)c) element

8)a) You can only define one constructor.,c) Constructors must have the same name as the class itself.
d) Constructors are invoked using the new operator when an object is created.

9)a) radius ,d) findArea

10)d) a local variable

11)b) The method cannot be used outside the class.

12)d) instance

13)b) int a() = new int[2] ,c) int[] a = new int(2) ,d) int a = new int[2]

14)b) conditional operator

15)b) return statements can be used in void methods to return values.

16)b) polymorphism

17)c) actionPerformed

18)c) try

19)d) addItemListener()

20)a) is­a

Note:Please ask in case of any doubt,Thanks!!

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