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Learn about interfaces, arrays of type Object, etc.

Revised: Sun Apr 03 17:27:47 CDT 2016

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Table of contents

Preface

This module is one of a series of modules designed to teach you about Object-Oriented Programming (OOP) using Java.

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Figures

  • Figure 1 . Command line output for Prob05.

Listings

Preview

In this module, you will learn about :

  • Interface definitions
  • Implementing an interface in a class definition
  • Defining interface methods in a class definition
  • Storing references to new objects in elements of an array of type Object
  • Casting elements to an interface type in order to call interface methods
  • Parameterized constructors
  • Overridden toString method

Program specifications

Write a program named Prob05 that uses the class definition shown in Listing 1 to produce the output shown in Figure 1 on the command line screen.

Figure 1 . Command line output for Prob05.
Prob05 Put your first name herePut your last name here -18 -17 -16-17 -17 -17 -12 -12 -12

No graphic output images required

There are no graphic output images required by this program. Therefore, it can be compiled and executed without a requirement to have Ericson's medialibrary on the classpath.

Required text output

The output, which appears on the command line screen, consists of the six lines of text shown in Figure 1 .

Because the program generates random data for testing, the actual values will differ from one run to the next. However, in all cases:

  • The values in the first row of numbers will be a sequence of consecutive integers in increasing algebraic order from left to right.
  • All three values in the second row of numbers will match the value of the center number in the first row of numbers.
  • All three values in the third row of numbers will be algebraically five greater than the values in the second row of numbers.

New classes

You may define new classes as necessary to cause your program to behave as required, but you may not modify the class definition for the class named Prob05 shown in Listing 1 .

Questions & Answers

Ayele, K., 2003. Introductory Economics, 3rd ed., Addis Ababa.
Widad Reply
can you send the book attached ?
Ariel
?
Ariel
What is economics
Widad Reply
the study of how humans make choices under conditions of scarcity
AI-Robot
U(x,y) = (x×y)1/2 find mu of x for y
Desalegn Reply
U(x,y) = (x×y)1/2 find mu of x for y
Desalegn
what is ecnomics
Jan Reply
this is the study of how the society manages it's scarce resources
Belonwu
what is macroeconomic
John Reply
macroeconomic is the branch of economics which studies actions, scale, activities and behaviour of the aggregate economy as a whole.
husaini
etc
husaini
difference between firm and industry
husaini Reply
what's the difference between a firm and an industry
Abdul
firm is the unit which transform inputs to output where as industry contain combination of firms with similar production 😅😅
Abdulraufu
Suppose the demand function that a firm faces shifted from Qd  120 3P to Qd  90  3P and the supply function has shifted from QS  20  2P to QS 10  2P . a) Find the effect of this change on price and quantity. b) Which of the changes in demand and supply is higher?
Toofiq Reply
explain standard reason why economic is a science
innocent Reply
factors influencing supply
Petrus Reply
what is economic.
Milan Reply
scares means__________________ends resources. unlimited
Jan
economics is a science that studies human behaviour as a relationship b/w ends and scares means which have alternative uses
Jan
calculate the profit maximizing for demand and supply
Zarshad Reply
Why qualify 28 supplies
Milan
what are explicit costs
Nomsa Reply
out-of-pocket costs for a firm, for example, payments for wages and salaries, rent, or materials
AI-Robot
concepts of supply in microeconomics
David Reply
economic overview notes
Amahle Reply
identify a demand and a supply curve
Salome Reply
i don't know
Parul
there's a difference
Aryan
Demand curve shows that how supply and others conditions affect on demand of a particular thing and what percent demand increase whith increase of supply of goods
Israr
Hi Sir please how do u calculate Cross elastic demand and income elastic demand?
Abari
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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