Question 1

How can a method send a primitive value back to the caller?

Accepted Answer

Methods can use the "return" statement to send a primitive value back to the caller.

Question 2

Which of the following is NOT true about return statements?

Accepted Answer

Return statements cannot be used in void methods to return values as void methods do not return any value.

Question 3

public static char methodHeading(int n, double num)Which of the following statements about the method heading in the accompanying figure is NOT true?

Accepted Answer

The method's accessibility (whether it can be used outside the class or not) is not specified by the given method heading. Without a visibility modifier (like public, protected, or private), we cannot determine its accessibility from the provided information. The other statements are true based on the method heading: it has two parameters (A is true), "methodHeading" is the name of the method (C is true), and it returns a value of type char (D is true).

Question 4

All the methods defined in a class must have different names.

Accepted Answer

It is possible to have methods with the same name in a class as long as they have different parameters (method overloading).

Question 5

public static double secret(int first, double second)
{
Double temp; if (second > first)
Temp = first * second;
Else
Temp = first - second; return temp;
}What is the return type of the method in the accompanying figure?

Accepted Answer

The method returns a variable of type double, so the return type of the method should be double.

Question 6

The signature of a method consists of only its formal parameter list.

Accepted Answer

The signature of a method consists of its name and formal parameter list.

Question 7

Within a method, an identifier used to name a variable in the outer block of the method can be used to name any other variable in an inner block of the method.

Accepted Answer

The answer of Within a method, an identifier used to...

Question 8

public int mystery(int x, int y)
{
If (x >= y)
Return x - y;
Else
Return x + y;
}Based on the code in the accompanying figure, what would be the output of the following statement?System.out.println(mystery(8, mystery(2, 1));

Accepted Answer

The inner call to mystery(2, 1) returns 2 + 1 = 3 because 2 is not greater than or equal to 1. Then, the outer call becomes mystery(8, 3), which returns 8 - 3 = 5 because 8 is greater than 3. However, there seems to be a mistake in my initial response as I mistakenly provided the explanation for an answer of 5, which corresponds to option A, not B. The correct choice should have been A based on the provided explanation.

Question 9

public int mystery(int x, int y)
{
If (x >= y)
Return x - y;
Else
Return x + y;
}Based on the code in the accompanying figure, what would be the output of the following statement?System.out.println(mystery(8,7));

Accepted Answer

The method returns the result of x - y if x is greater than or equal to y. Since 8 is greater than 7, it returns 8 - 7, which is 1.

Question 10

What is an actual parameter?

Accepted Answer

An actual parameter is the value passed into a method by a method call.

Question 11

public static double secret(int first, double second)
{
Double temp; if (second > first)
Temp = first * second;
Else
Temp = first - second; return temp;
}Which of the following is a valid call to the method in the accompanying figure?

Accepted Answer

Option A is the only valid call to the method as it follows the correct parameter data types and order. Option B includes unnecessary syntax and is invalid. Option C includes undefined parameter variables and is invalid. Option D changes the return type to int which does not match the method signature and is invalid.

Question 12

public static double secret(int first, double second)
{
Double temp; if (second > first)
Temp = first * second;
Else
Temp = first - second; return temp;
}Based on the code in the accompanying figure, what would be the output of the following statement?System.out.println(secret(5, 7.0));

Accepted Answer

The condition `second > first` is true (7.0 > 5), so `temp = first * second` is executed, resulting in `temp = 5 * 7.0 = 35.0`.

Question 13

public static double secret(int first, double second)
{
Double temp; if (second > first)
Temp = first * second;
Else
Temp = first - second; return temp;
}What is the name of the method in the accompanying figure?

Accepted Answer

The name of the method is "secret".

Question 14

Which of the following statements is NOT true?

Accepted Answer

The operator new is only used for allocating memory for objects dynamically, not for all types of variables. For example, primitive data types like int or double do not need the operator new to allocate memory.

Question 15

Java allows the programmer to declare a variable in the initialization statement of the for statement.

Accepted Answer

In Java, the initialization statement of a for loop can include a variable declaration. For example:

for(int i=0; i<10; i++){
  // loop body
}

In this example, the variable i is declared and initialized to 0 in the for statement.

Question 16

Formal parameters of primitive data types provide ____ between actual parameters and formal parameters.

Accepted Answer

Formal parameters of primitive data types create a one-way link between actual and formal parameters, meaning changes to formal parameters do not affect actual parameters.

Question 17

Which modifier is used to specify that a method cannot be used outside a class?

Accepted Answer

The private modifier specifies that a method can only be accessed within the class it is declared in, making it impossible to use outside the class. The public modifier allows the method to be accessed from anywhere in the program, while the abstract modifier is used for creating abstract classes and methods, and the static modifier is used for creating methods and variables that belong to the class itself rather than an instance of the class.

Question 18

Two methods are said to have different formal parameter lists if both methods have a different number of formal parameters, or if the data types of the formal parameters are the same.

Accepted Answer

Two methods are said to have different formal parameter lists if they have a different number of formal parameters or if the data types of the formal parameters are different, not the same.

Question 19

public static double secret(int first, double second)
{
Double temp; if (second > first)
Temp = first * second;
Else
Temp = first - second; return temp;
}Which of the following is NOT part of the heading of the method in the accompanying figure?

Accepted Answer

"double temp;" is not part of the heading of the method as it is a declaration of a variable within the method's body. The heading of the method includes the access modifier (public), the static keyword, the method name (secret), and the parameter list (int first, double second).

Question 20

public static char methodHeading(int n, double num)Based on the method heading in the accompanying figure, what is the return type of the value returned?

Accepted Answer

The return type of the method is "char" as indicated before the method name.

Quiz 7: User-Defined Methods

How can a method send a primitive value back to the caller?

Which of the following is NOT true about return statements?

public static char methodHeading(int n, double num) Which of the following statements about the method heading in the accompanying figure is NOT true?

All the methods defined in a class must have different names.

public static double secret(int first, double second) { Double temp; if (second > first) Temp = first * second; Else Temp = first - second; return temp; }What is the return type of the method in the accompanying figure?

The signature of a method consists of only its formal parameter list.

Within a method, an identifier used to name a variable in the outer block of the method can be used to name any other variable in an inner block of the method.

public int mystery(int x, int y) { If (x >= y) Return x - y; Else Return x + y; }Based on the code in the accompanying figure, what would be the output of the following statement?System.out.println(mystery(8, mystery(2, 1) ) ;

public int mystery(int x, int y) { If (x >= y) Return x - y; Else Return x + y; }Based on the code in the accompanying figure, what would be the output of the following statement?System.out.println(mystery(8,7) ) ;

What is an actual parameter?

public static double secret(int first, double second) { Double temp; if (second > first) Temp = first * second; Else Temp = first - second; return temp; }Which of the following is a valid call to the method in the accompanying figure?

public static double secret(int first, double second) { Double temp; if (second > first) Temp = first * second; Else Temp = first - second; return temp; }Based on the code in the accompanying figure, what would be the output of the following statement?System.out.println(secret(5, 7.0) ) ;

public static double secret(int first, double second) { Double temp; if (second > first) Temp = first * second; Else Temp = first - second; return temp; }What is the name of the method in the accompanying figure?

Which of the following statements is NOT true?

Java allows the programmer to declare a variable in the initialization statement of the for statement.

Formal parameters of primitive data types provide ____ between actual parameters and formal parameters.

Which modifier is used to specify that a method cannot be used outside a class?

Two methods are said to have different formal parameter lists if both methods have a different number of formal parameters, or if the data types of the formal parameters are the same.

public static double secret(int first, double second) { Double temp; if (second > first) Temp = first * second; Else Temp = first - second; return temp; }Which of the following is NOT part of the heading of the method in the accompanying figure?

public static char methodHeading(int n, double num) Based on the method heading in the accompanying figure, what is the return type of the value returned?