Deck 5: Methods

Question 1

In the following code,System.out.println(num)is an example of _________. double num = 5.4;
System.out.println(num);
Num = 0.0;

A) a value-returning method
B) a void method
C) a complex method
D) a local variable

Answer 1

B

Question 2

What is wrong with the following method call? displayValue (double x);

A) There is nothing wrong with the statement.
B) displayValue will not accept a parameter.
C) Do not include the data type in the method call.
D) x should be a String.

Answer 2

C

Question 3

What will be returned from the following method? public static double methodA()
{
Double a = 8.5 + 9.5;
Return a;
}

A) 18.0
B) 18 (as an integer)
C) 8
D) This is an error

Answer 3

A

Question 4

Methods are commonly used to

A) speed up the compilation of a program
B) break a problem down into small manageable pieces
C) emphasize certain parts of the logic
D) document the program

Question 5

Which of the following would be a valid method call for the following method? public static void showProduct (int num1,double num2)
{
Int product;
Product = num1 * (int)num2;
System.out.println("The product is " + product);
}

A) showProduct(5.5,4.0);
B) showProduct(10.0,4);
C) showProduct(10,4.5);
D) showProduct(33.0,55.0);

Question 6

Which of the following is not part of a method call?

A) method name
B) return type
C) parentheses
D) all of the above are part of a method call

Question 7

Which of the following is not a benefit derived from using methods in programming?

A) problems are more easily solved
B) simplifies programs
C) code reuse
D) all of the above are benefits

Question 8

Local variables

A) are hidden from other methods
B) may have the same name as local variables in other methods
C) lose the values stored in them between calls to the method in which the variable is declared
D) All of the above

Question 9

All @param tags in a method's documentation comment must

A) end with a */
B) appear after the general description of the method
C) appear before the method header
D) span several lines

Question 10

This part of a method is a collection of statements that are performed when the method is executed.

A) method header
B) return type
C) method body
D) method modifier

Question 11

If method A calls method B,and method B calls method C,and method C calls method D,when method D finishes,what happens?

A) control is returned to method A
B) control is returned to method B
C) control is returned to method C
D) the program terminates

Question 12

Given the following method header,which of the method calls would be an error? public void displayValues(int x,int y)

A) displayValue(a,b);// where a is a short and b is a byte
B) displayValue(a,b);// where a is an int and b is a byte
C) displayValue(a,b);// where a is a short and b is a long
D) they would all give an error

Question 13

In a @return tag statement the description

A) cannot be longer than one line
B) describes the return value
C) must be longer than one line
D) describes the parameter values

Question 14

When a method tests an argument and returns a true or false value,it should return

A) a zero for true and a one for false
B) a boolean value
C) a zero for false and a non-zero for true
D) a method should not be used for this type test

Question 15

Functional decomposition is

A) the backbone of the scientific method
B) the process of decomposing functions
C) the process of breaking a problem down into smaller pieces
D) the process of dead plants decomposing and turning back into soil

Question 16

When an object,such as a String,is passed as an argument,it is

A) actually a reference to the object that is passed
B) passed by value like any other parameter value
C) encrypted
D) necessary to know exactly how long the string is when writing the program

Question 17

The lifetime of a method's local variable is

A) the duration of the program
B) the duration of the class to which the method belongs
C) the duration of the method that called the local variable's method
D) only while the method is executing

Question 18

When an argument is passed to a method,

A) its value is copied into the method's parameter variable
B) its value may be changed within the called method
C) values may not be passed to methods
D) the method must not assign another value to the parameter that receives the argument

Question 19

This type of method performs a task and sends a value back to the code that called it.

A) value-returning
B) void
C) complex
D) local

Question 20

The header of a value-returning method must specify this.

A) The method's local variable names
B) The name of the variable in the calling program that will receive the returned value
C) The data type of the return value
D) All of the above

Question 21

Values stored in local variables

A) are lost between calls to the method in which they are declared
B) retain their values from the last call to the method in which they are declared
C) may be referenced by the calling method
D) may be referenced by any other method,if the method in which they are declared is a public method

Question 22

Which of the following is not a part of the method header?

A) return type
B) method name
C) parentheses
D) semicolon

Question 23

What will be the result of the following code? int num;
String str = "555";
Num = Integer.parseInt(string str)+ 5;

A) num will be set to 560
B) str will have a value of "560"
C) the last line of code will cause an error
D) neither num or str will be changed

Question 24

Given the following method header,which of the method calls would be an error? public void displayValues(double x,int y)

A) displayValue(a,b);// where a is a long and b is a byte
B) displayValue(a,b);// where a is an int and b is a byte
C) displayValue(a,b);// where a is a short and b is a long
D) they would all give an error

Question 25

When an argument value is passed to a method,the receiving parameter variable is

A) declared within the body of the method
B) declared in the method header inside the parentheses
C) declared in the calling method
D) uses the declaration of the argument

Question 26

When writing the documentation comments for a method,you can provide a description of each parameter by using a

A) @comment tag
B) @doc tag
C) @param tag
D) @return tag

Question 27

A value-returning method must specify this as its return type in the method header.

A) an int
B) a double
C) a boolean
D) any valid data type

Question 28

In the following code,Integer.parseInt(str),is an example of ________. int num;
String str = "555";
Num = Integer.parseInt(str)+ 5;

A) a value-returning method
B) a void method
C) a local variable
D) a complex method

Question 29

Local variables can be initialized with

A) constants
B) parameter values
C) the results of an arithmetic operation
D) any of the above

Question 30

Which of the following would be a valid method call for the following method? public static void showProduct(double num1,int num2)
{
Double product;
Product = num1 * num2;
System.out.println("The product is " +
Product);
}

A) showProduct("5","40");
B) showProduct(10.0,4.6);
C) showProduct(10,4.5);
D) showProduct(3.3,55);

Question 31

Which of the following is included in a method call?

A) return type
B) method modifiers
C) parentheses
D) return variable

Question 32

The process of breaking a problem down into smaller pieces is called

A) functional decomposition
B) scientific method
C) top-down programming
D) whole-into-part

Question 33

What will be returned from the following method? public static int methodA()
{
Double a = 8.5 + 9.5;
Return a;
}

A) 18.0
B) 18 (as an integer)
C) 8.0
D) This is an error

Question 34

In a general sense,a method is

A) a plan
B) a statement inside a loop
C) a comment
D) a collection of statements that performs a specific task

Question 35

Assume that the following method header is for a method in class A. public void displayValue(int value)
Assume that the following code segments appear in another method,also in class A.Which contains a legal call to the displayValue method?

A) int x = 7;
Void displayValue(x);
B) int x = 7;
DisplayValue(x);
C) int x = 7;
DisplayValue(int x);
D) int x = 7;
DisplayValue(x)

Question 36

This type of method performs a task and then terminates.

A) value-returning
B) void
C) local
D) simple

Question 37

To document the return value of a method,use this in a documentation comment.

A) The @param tag
B) The @comment tag
C) The @return tag
D) The @returnValue tag

Question 38

Any method that calls a method with a throws clause in its header must

A) handle the potential exception
B) have the same throws clause
C) Both of the above
D) do nothing,the called program will take care of the throws clause

Question 39

Breaking a program down into small manageable methods

A) makes problems more easily solved
B) allows for code reuse
C) simplifies programs
D) all of the above

Question 40

You should always document a method by writing comments that appear

A) just before the method's definition.
B) just after the method's definition.
C) at the end of the file.
D) only if the method is more than five lines long.

Question 41

The expression in a return statement can be any expression that has a value.

Question 42

A parameter variable's scope is the method in which the parameter is declared.

Question 43

Constants,variables,and the values of expressions may be passed as arguments to a method.

Question 44

No statement outside the method in which a parameter variable is declared can access the parameter by its name.

Question 45

You must have a return statement in a value-returning method.

Question 46

In the method header the static method modifier means the method is available to code outside the class.

Question 47

In the method header,the method modifier public means that the method belongs to the class,not a specific object.

Question 48

Any method that calls a method with a throws clause in its header must either handle the potential exception or have the same throws clause.

Question 49

A value-returning method can return a reference to a non-primitive type.

Question 50

Only constants and variables may be passed as arguments to methods.