CIS 340 quiz 4

In java, methods must include all of the following except

A call to another method

Every method does not need

A return value

3 principles of object oriented programming

Abstraction, encapsulation, modularity

How do you specify that a parameter within a method header is mandatory or required? Explain in a sentenance or two

All parameters are required by default, Nothing special needs to be done to make a parameter mandatory. Just declare the parameter with its data type and identifier, and its required by default.

The code between a pair of curly braces in a method is a

Block

A constructor _______ parameters

Can recieve

A program or class that instantiates objects of another prewritten class is an

Class client

A public static method named computeSum() is located in ClassA. To call the method from within ClassB, use the statement

ClassA.computeSum();

Parameters are specified in a method declaration as a

Comma-separated list of variable declarations

An example of instantiation

Dog myDog = new Dog();

An objects data items are also known as

Fields

The nonstatic data components of a class often are referred to as the ________ of that class

Instance variables

Nonambigious, overloaded methods must have the same

Name

If you use the automatically supplied default constructor when you create an object

Numeric fields are set to 0 (zero)

If you create a class that contains one method, and instantiate two objects, you usually store _____ for use with the objects

One copy of the method

A method variable ______ a class variable with the same name

Overrides

The portion of a program within which you can reference a variable is the variable's

Scope

If a class is named Student, the class constructor name is

Student()

Usually, you want each instantiation of a class to have its own copy of

The data fields

If you declare a variable as an instance variable within a class, and you declare and use the same variable name within a method of the class, then within the method

The variable used inside the method takes precedence

True or false, method calls can be nested, i.e. method calls can be placed inside other method calls

True

You can declare variables with the same name multiple times

Within a method, in different blocks of the method

If a method is written to receive a double parameter, and you pass an integer to the method, then the method will

Work correctly, but be promoted to a double

Every method must contain

a return type

The keyword final used within a variable declaration indicates

a symbolic constant

Which of the following is a correct call to a method declared as public static void aMethod(char code)?

aMethod('Q');

Suppose you declare an object as Book myJournal; before you store data in myJournal, you

also must explicitly allocate memory for it

The body of a class is always written

between curly braces

The method public static boolean testValue(int response) returns ____

boolean value

A constructor _________ overloaded

can be

The this reference

can be used implicitly

The method with the declaration public static char procedure(double d) has a method type of

char

Variables that are shared by every instantiation of a class are

class variables

Assume there is a method called isPreferredCustomer. The method requires one argument of type String, which represents a customer ID number. The method returns a boolean indicating if that customer is preferred or not. Write code to call the method isPreferredCustomer and pass it the string literal 12345678 as an argument. If the customer is a preferred customer, set the variable deliveryFee to zero. Assume deliveryFee is already declared as a variable as follows: double deliveryFee = 0.0;

if ( isPreferredCustomer(String '12345678') ) deliveryFee = 0;

The concept of allowing a class's private data to be changed only by a class' own methods is known as

information hiding

The method with the declaration public static int aMethod(double d) is a method type of

int

You send messages or information to an object through its

methods

When a block exists within another block, the blocks are

nested

Methods that you reference with individual objects are

nonstatic

Java classes are stored in a folder or

package

All method declarations contain

parenthesis

An example of an access modifier is ___

private

Most class data fields are

private

Which method declaration below has a method signature different than the method below? private static int ProcessInput(int a, double b, int c)

private static int ProcessInput(double a, int b, int c)

Write a method setSpeed, which is private and static. IT should accept one parameter called speed, of type double. setSpeed does not return a value. The body of setSpeed method should contain one printf method, which prints one line to the console and tells the user that the speed has been set to the new speed. Assume now that you are working in the main method of the class Car and the setSpeed method is in the same class. Call the setSpeed method. For the parameter speed, supply an argument of an appropriate data type such that you are setting the speed to six miles an hour.

private static void double setSpeed(double speed) { System.out.printf("speed has been set to %f", speed); } setSpeed(6.0);

Which of the following method declarations is correct for a static method named displayFacts() if the method receives an int argument?

public static void displayFacts(int data)

Declare a method called calculateSalesTax, which accepts two parameters: a tax rate and a purchase amount. Example values of tax rate are 0.08 and 0.10. Example values of purchase amounts are 399.99 and 14. Tax rate amounts should be verified. If they are lower than 7.5%, the method should use a default rate of 7.5% by overwriting the value supplied as a parameter. The method should return the total sales tax, which is calculated as the purchase amount times the tax rate.

public static void double calculateSalesTax(double taxRate, double purchaseAmount) { double totalSalesTaxRate; double totalTaxRate; if(taxRate < 0.075) taxRate =0.075; totalSalesTaxRate = totalTaxRate + taxRate*purchaseAmount; return totalSalesTaxRate;

Which of the following could be the last legally coded line of a method declared as public static int getVal(double sum)?

return 77;

A method's type is the same as its

return type

Which of the following statements determines the square root of a number and assigns it to the variable s?

s = Math.sqrt(number);

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

showResults(12.2, 67);

A return type of ___ is specified for a method that does not return a value

void