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Overview
The top-selling beginning Java book is now fully updated for Java 7!
Java is the platform-independent, object-oriented programming language used for developing web and mobile applications. The revised version offers new functionality and features that have programmers excited, and this popular guide covers them all. This book helps programmers create basic Java objects and learn when they can reuse existing code. It's just what inexperienced Java developers need to get going quickly with Java 2 Standard Edition 7.0 (J2SE 7.0) and Java Development Kit 7.0 (JDK 7).
- Explores how the new version of Java offers more robust functionality and new features such as closures to keep Java competitive with more syntax-friendly languages like Python and Ruby
- Covers object-oriented programming basics with Java, code reuse, the essentials of creating a Java program using the new JDK 7, creating basic Java objects, and new Eclipse features
- A companion web site offers all code from the book and bonus chapters
Written by a Java trainer, Java For Dummies, 5th Edition will enable even novice programmers to start creating Java applications quickly and easily.
When doing anything with Java, you need to know your Java words — those programming words, phrases, and nonsense terms that have specific meaning in the Java language, and get it to do its thing.This Cheat Sheet tells you all about Java's categories of words.Java's 51 keywordsThe Java programming language has 50 keywords.
About The Author
Barry Burd, PhD, is a professor of mathematics and computer science at Drew University. He frequently contributes to various online technology resources, including JavaBoutique.com, and is the author of Ruby On Rails For Dummies and the previous edition of this book.
Articles From The Book
3 results
Java
Articles
The Java code you see here uses several API classes and methods. The setTitle, setLayout, setDefaultCloseOperation, add, setSize, and setVisible methods all belong to the javax.swing.JFrame class.Java code for defining a frame.import java.awt.FlowLayout;import javax.swing.JFrame;import javax.swing.JButton; @SuppressWarnings("serial")public class SimpleFrame extends JFrame { public SimpleFrame() {setTitle("Don't click the button!
Java
Articles
Once upon a time, most Java programmers used a text-based development interface. They typed a command in a plain-looking window, usually with white text on a black background. How dull!The plain-looking window goes by the various names, depending on the kind of operating system that you use. In Windows, a text window of this kind is a command prompt window.
Java
Articles
Java lets you define a class. What does that mean? Think of it this way. What distinguishes one bank account from another? If you ask a banker this question, you hear a long sales pitch. The banker describes interest rates, fees, penalties — the whole routine. Don’t worry, for this example, you don’t need to know all of that.
Java
Articles
Enforcing rules is tough. Luckily for you, Java has a more elegant solution than many parents are faced with. You can use accessor methods to make your stubborn code follow your rules.Here’s some code that hides the fields.public class Account {private String name;private String address;private double balance; public void setName(String n) {name = n;} public String getName() {return name;} public void setAddress(String a) {address = a;} public String getAddress() {return address;} public void setBalance(double b) {balance = b;} public double getBalance() {return balance;}} Go back and take a quick look at the setName method.
Java
Articles
JShell is a Java 9 tool that lets you explore in programming. JShell makes it easy to play around without the fear of disastrous consequences. Java programs often use the same old, tiresome refrain:public class <em>SomethingOrOther</em> { public static void main(String args[>) {
A Java program requires this verbose introduction becauseIn Java the entire program is a class.
Java
Articles
You can specify a file’s exact location in your Java code. Code like new File("C:\\Users\\bburd\\workspace\\08-01\\EmployeeInfo.txt") looks really ugly, but it works.In the preceding paragraph, did you notice the double backslashes in “C: \\Users\\bburd\\workspace …”? If you’re a Windows user, you’d be tempted to write C:\Users\bburd\workspace … with single backslashes.
Java
Articles
You’re sitting behind the desk at the Java Motel. Look! Here comes a party of five. These people want a room, so you need software that checks whether a room is vacant. If one is, the software modifies the GuestList.txt file by replacing the number 0 with the number 5. As luck would have it, the software is on your hard drive.
Java
Articles
Here’s big news! In Java, you can define a class inside of another class! Here, the GameFrame class contains a class named MyActionListener.import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.Random; import javax.swing.JButton;import javax.swing.JFrame;import javax.
Java
Articles
As part of your programming with Java, you may be looking to create randomness. Achieving real randomness is surprisingly difficult. Mathematician Persi Diaconis says that if you flip a coin several times, always starting with the head side up, you’re likely to toss heads more often than tails. If you toss several more times, always starting with the tail side up, you’ll likely toss tails more often than heads.
Java
Articles
Java lets you define a method within a class. Imagine a table containing the information about two accounts. (If you have trouble imagining such a thing, just look at the table below.)
Without Object-Oriented Programming
Name
Address
Balance
Barry Burd
222 Cyberspace Lane
24.02
Jane Q. Public
111 Consumer Street
55.
Java
Articles
Both interfaces and abstract classes have abstract methods in Java. But the abstract methods play slightly different roles in these two kinds of reference types. How can you keep it all straight in your mind?The first thing to do is to remember that no one learns about object-oriented programming concepts without getting lots of practice in writing code.
Java
Articles
The annotation is extra code that provides useful information about the nature of your Java program. The following codes uses the SuppressWarnings annotation.import java.awt.FlowLayout;import javax.swing.JFrame;import javax.swing.JButton; @SuppressWarnings("serial")public class SimpleFrame extends JFrame { public SimpleFrame() {setTitle("Don't click the button!
Java
Articles
You can use nested if statements in Java. Have you seen those cute Russian matryoshka nesting dolls? Open one, and another one is inside. Open the second, and a third one is inside it. You can do the same thing with Java’s if statements. (Talk about fun!)Check out this code with nested if statements.import static java.
Java
Articles
An int value inside a switch statement works in any version of Java, old or new. (For that matter, char values and a few other kinds of values have worked in Java's switch statements ever since Java was a brand-new language.)Starting with Java 7, you can set it up so that the case to be executed in a switch statement depends on the value of a particular string.
Java
Articles
You can use subclasses in Java. Creating subclasses is fine, but you gain nothing from these subclasses unless you write code to use them. So here, you explore code that uses subclasses.Now the time has come for you to classify yourself as either a type-F person, a type-P person, or a type-T person.
A type-F person wants to see the fundamentals.
Java
Articles
Imagine a Java program that gets input from two different files or from a Scanner and a disk file. To make sure that you clean up properly, you put close method calls in a finally clause.import java.io.File;import java.io.IOException;import java.util.Scanner; public class Main { public static void main(String args[]) {Scanner scan1 = null;Scanner scan2 = null;<strong>try {</strong>scan1 = new Scanner(new File("File1.
Java
Articles
You have a couple options for filling an array in Java. One way is with an array initializer. When you use an array initializer, you don’t even have to tell the computer how many components the array has. The computer figures this out for you.That bold doodad is an array initializer.Here’s an example for using an array initializer.
Java
Articles
A Java iterator spits out a collection's values, one after another. To obtain a value from the collection, you call the iterator's next method. To find out whether the collection has any more values in it, you call the iterator's hasNext method. The code below uses an iterator to display people's names.Here’s some code for iterating through a collection.
Java
Articles
A serialVersionUID is a number that helps Java avoid version conflicts when you send an object from one place to another. For example, you can send the state of your JFrame object to another computer’s screen. Then the other computer can check the frame's version number to make sure that no funny business is taking place.
Java
Articles
When doing anything with Java, you need to know your Java words — those programming words, phrases, and nonsense terms that have specific meaning in the Java language, and get it to do its thing.This Cheat Sheet tells you all about Java's categories of words.Java's 51 keywordsThe Java programming language has 50 keywords.
Java
Articles
The words int and double are examples of primitive types (also known as simple types) in Java. The Java language has exactly eight primitive types. As a newcomer to Java, you can pretty much ignore all but four of these types. (As programming languages go, Java is nice and compact that way.)The types that you shouldn’t ignore are int, double, char, and boolean.
Java
Articles
When you write a Java program, you can divide the program's words into several categories. This cheat sheet tells you all about those categories.
Keywords
The Java programming language has 50 keywords. Each keyword has a specific meaning in the language. You can't use a keyword for anything other than its pre-assigned meaning.
Java
Articles
Java 9 comes complete with an interactive JShell environment. You type a statement, and JShell responds immediately by executing the statement. That's fine for simple statements, but what happens when you have a statement inside of a block?In JShell, you can start typing a statement with one or more blocks. JShell doesn't respond until you finish typing the entire statement — blocks and all.
Java
Articles
You can use method references in Java. Here’s an example. Taken as a whole, the entire assembly line adds up the prices of DVDs sold. The code below illustrates a complete program using streams and lambda expressions.import java.text.NumberFormat;import java.util.ArrayList; public class TallySales { public static void main(String[] args) {ArrayList<Sale> sales = new ArrayList<>();NumberFormat currency = NumberFormat.
Java
Articles
Java has fancy methods that make optimal use of streams and lambda expressions. With streams and lambda expressions, you can create an assembly line. The assembly-line solution uses concepts from functional programming.The assembly line consists of several methods. Each method takes the data, transforms the data in some way or other, and hands its results to the next method in line.