Object Oriented Programming using Java phần 9 potx

... and what can be done about it. 9. 1.2 Java to the Rescue Part of the problem, according to the inventors of Java, can be traced to programming languages themselves. Java was designed to provide ... considerations. Java is designed for such situations. 9. 1.3 Problems Remain in Java There is one area where the designers of Java chose not to detect errors automati- cally: numeric...

Ngày tải lên: 12/08/2014, 21:21

... subclass of Object , a variable of type Object can refer to any object whatsoever, of any type. Java has several standard data structures that are designed to hold Object s, but since every object ... like this can be done in most programming languages. The cen- tral new idea in object- oriented programming the idea that really distinguishes it from traditional programming...

Ngày tải lên: 12/08/2014, 21:21

... the answer. 12 Object Oriented Programming using Java Notes for the Computer Science Module Object Oriented Programming COMP200 Adapted from Introduction to Programming Using Java Version 5.0, ... the Object- oriented Programming Concepts” section of the Java Tuto- rial by Sun MicroSystems. 16 Preface These notes are intended for a Second course in Object- Orient...

Ngày tải lên: 12/08/2014, 21:21

... an object Wrapper Classes and Autoboxing Recall that there are two kinds of types in JAVA: primitive types and object types (Classes). In some object- oriented languages, everything is an object. ... java. awt, their full names are actually java. awt.Graphics, java. awt.Color and java. awt.Font. (I hope that by now you’ve gotten the hang of how this naming thing works in JAVA. )...

Ngày tải lên: 12/08/2014, 21:21

... for the standard Java API was produced using javadoc. Javadoc documentation is prepared from special comments that are placed in the Java source code file. Recall that one type of Java comment begins ... documentation, you need to run the javadoc tool. You can use javadoc in a command line interface similarly to the way that the javac and java commands are used. Javadoc can also be a...

Ngày tải lên: 12/08/2014, 21:21

... important ways in Java s standard packages. You’ll learn about some of these standard interfaces in the next few chapters. 95 import java. awt.∗; import java. awt.event.∗; import javax.swing.∗; public ... there is an ID variable in each student object, there is only one nextUniqueID variable. 99 Such multiple inheritance is not allowed in Java. The designers of Java wanted to keep...

Ngày tải lên: 12/08/2014, 21:21

... RandomStringsPanel import java. awt.Color; import java. awt.Font; import java. awt.Graphics; import javax.swing.JPanel; 126 import java. awt.∗; import java. awt.event.∗; import javax.swing.∗; public class ... handling events in JAVA. A listener is an object that includes one or more event-handling methods. When an event is detected by another object, such as a button or menu, the lis...

Ngày tải lên: 12/08/2014, 21:21

... HelloWorldGUI4 .java. This version is a variation of HelloWorldGUI2 .java that uses anonymous nested classes where the original program uses ordinary, named nested classes: import java. awt.∗; import java. awt.event.∗; import ... make any changes at all to that class: import java. awt.Component; import java. awt.event.MouseEvent; import java. awt.event.MouseListener; import javax.swing...

Ngày tải lên: 12/08/2014, 21:21

... adding an object to a Set has no effect if that object was already in the set. • coll.contains (object) –returns a boolean value that is true if object is in the collection. Note that object is ... study investigate the object- oriented concepts of encapsulation, inheritance, and polymor- phism. The game is inspired by Timothy Budd’s version in his book AN INTRODUC- TION TO OBJECT...

Ngày tải lên: 12/08/2014, 21:21

... PrintWriter object. You do this by constructing a new PrintWriter object, using the Writer as input to the constructor. For example, if charSink is of type Writer, then you could say 2 09 PrintWriter ... differences in path names between plat- forms, Java has the class java. io.File . An object belonging to this class represents a file. More precisely, an object of type File repres...

Ngày tải lên: 12/08/2014, 21:21