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Introduction to Java Applications

  • May 24, 2011
This chapter introduces Java application programming, including examples of programs that display messages on the screen and a program that obtains two numbers from a user, calculates their sum and displays the result. You'll learn how to instruct the computer to perform arithmetic calculations and save their results for later use. The last example demonstrates how to make decisions.
This chapter is from the book

This chapter is from the book

Java How to Program (early objects), 9th EditionJava How to Program (early objects), 9th Edition

Learn More Buy

This chapter is from the book

This chapter is from the book

Java How to Program (early objects), 9th EditionJava How to Program (early objects), 9th Edition

Learn More Buy
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Objectives

In this chapter you'll learn:

  • To write simple Java applications.
  • To use input and output statements.
  • Java's primitive types.
  • Basic memory concepts.
  • To use arithmetic operators.
  • The precedence of arithmetic operators.
  • To write decision-making statements.
  • To use relational and equality operators.

Outline

2.1 Introduction

2.2 Your First Program in Java: Printing a Line of Text

2.3 Modifying Your First Java Program

2.4 Displaying Text with printf

2.5 Another Application: Adding Integers

2.6 Memory Concepts

2.7 Arithmetic

2.8 Decision Making: Equality and Relational Operators

2.9 Wrap-Up

Summary | Self-Review Exercises | Answers to Self-Review Exercises | Exercises | Making a Difference

2.1 Introduction

This chapter introduces Java application programming. We begin with examples of programs that display messages on the screen. We then present a program that obtains two numbers from a user, calculates their sum and displays the result. You'll learn how to instruct the computer to perform arithmetic calculations and save their results for later use. The last example demonstrates how to make decisions. The application compares numbers, then displays messages that show the comparison results.

This chapter uses tools from the JDK to compile and run programs. We've also posted Dive Into® videos at www.deitel.com/books/jhtp9/ to help you get started with the popular Eclipse and NetBeans integrated development environments.

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