Quiz 7: User-Defined Methods

Methods are also called modules.

The class Math is contained in the package java.math.

In order to use the method isUpperCase of the class Character, the package java.lang must be explicitly imported.

Suppose that the following statement is included in a program. import static java.lang.Math.*; After this statement, a static method of the class Math can be called using just the method name.

Void methods use the return statement to return the value 0.

To use a predefined method, you must know the code in the body of the method.

An actual parameter is a variable or expression listed in a method call.

The word static is a return type in Java.

In Java, return is a reserved word.

Actual and formal parameters have a one-to-one correspondence.

The return statement must be the last line of the method.

When a program executes, the first statement to execute is always the first statement in the main method.

Void methods must have at least one parameter.

If a formal parameter is a variable of a primitive data type, then after copying the value of the actual parameter, there is no connection between the formal and actual parameter.

Reference variables as parameters allow you to return more than one value from a method.

You can use the class String to pass strings as parameters to a method and change the actual parameter.

Strings assigned to StringBuffer variables can be altered.

A local identifier is an identifier that is declared within a method or block and that is visible only within that method or block.

Just like the nesting of loops, Java allows the nesting of methods.

An identifier can be declared anywhere including within a class, and outside of every method definition (and every block).

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.

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

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

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.

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

What is an actual parameter? A) The value passed into a method by a method call B) The value returned by a method C) The type of the method D) A variable declared in the method heading

Which modifier is used to specify that a method cannot be used outside a class? A) public C) static B) abstract D) private

Based on the method heading in the accompanying figure, what is the return type of the value returned? A) static C) int B) char D) 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 value-returning method of type char.

How can a method send a primitive value back to the caller? A) It cannot send primitive values back to the caller B) By using the return statement C) By assigning the value to one of its parameters D) It can call its caller with the value

What is the name of the method in the accompanying figure? A) first C) secret B) second D) double

Which of the following is NOT part of the heading of the method in the accompanying figure? A) public B) static C) secret(int first, double second) D) double temp;

What is the return type of the method in the accompanying figure? A) public C) void B) int D) double

Which of the following is a valid call to the method in the accompanying figure? A) secret(5, 4.8); B) secret(int 5, double 4.8); C) secret(int x, double y); D) public static int secret(5, 4.8);

Based on the code in the accompanying figure, what would be the output of the following statement? System.out.println(secret(5, 7.0)); A) 5.0 B) 7.0 C) 2.0 D) 35.0

Based on the code in the accompanying figure, what would be the output of the following statement? System.out.println(mystery(8,7)); A) 1 B) 7 C) 8 D) 15

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)); A) 5 B) 7 C) 11 D) 13

Which of the following is NOT true about return statements? A) A value-returning 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.

Formal parameters of primitive data types provide ____ between actual parameters and formal parameters. A) a one-way link C) a three-way link B) a two-way link D) no link

Which of the following statements is NOT true? A) Reference variables do not directly contain the data. B) Reference variables contain the address of the memory space where the data is stored. C) The operator new must always be used to allocate space of a specific type, regardless of the type. D) A String variable is actually a reference variable of the type String.

Which of the following statements about strings is NOT true? A) When you use the assignment operator to assign a string to a String variable, the computer allocates memory space large enough to store the string. B) When a string is assigned to a String variable, the string cannot be changed. C) The class String contains many methods that allow you to change an existing string. D) A String variable is actually a reference variable.

Which of the following is an example of a local identifier in the example seen in the accompanying figure? A) intRate (Line 3) C) salary (Line 17) B) name (Line 4) D) t (line 15)

Which of the following identifiers seen in the accompanying figure is visible in method first? A) intRate (Line 3) C) u (Line 24) B) local variables of method funcOne D) first (Line 8)

Which of the following identifiers seen in the accompanying figure is NOT visible in method funcOne? A) intRate (Line 3) C) salary (Line 17) B) u (Line 24) D) first (Line 13)

Which of the following identifiers seen in the accompanying figure is visible in main? A) t (Line 5) C) local variables of method funcOne B) salary (Line 17) D) All identifiers are visible in main.

Which of the following identifiers seen in the accompanying figure is visible in block one? A) name (Line 4) C) local variables of main B) t (Line 9) D) x (Line 13)

Given the method heading in the accompanying figure, which of the following does NOT demonstrate method overloading? A) int larger(int x, int y, int z) B) int larger(char x) C) int max(int x, int y) D) double larger(double x, double y)

Given the method heading in the accompanying figure, which of the following would be an incorrect demonstration of method overloading? A) int larger(int a, int b) B) int larger(int x, int y, int z) C) double larger(double x, double y) D) char larger(char x, char y, char z)

The program that tests a method is called a ____ program. A) tester C) stub B) driver D) debugging

The technique to solve a problem by subdividing into smaller problems is known as divide-and- conquer and ____ design approach. A) top-down C) leveled B) bottom-up D) driver and stub