Object Oriented Programming using Java phần 4 potx

... 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 ... express the behavior of the objects. This is a powerful idea. However, something like this can be done in most programming languages. The cen- tral new idea in object- oriented...

Ngày tải lên: 12/08/2014, 21:21

... values of type int range from −2 147 483 648 to 2 147 483 647 . What happens when the result of a computation lies outside this range? For example, what is 2 147 483 647 + 1? And what is 2000000000 ∗ 2? ... considered an error. How- ever, Java does not automatically detect such errors. For example, it will compute the value of 2 147 483 647 + 1 to be the negative number, −2 147 483 648 . (W...

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 to whom the message is sent. If the receiver accepts 3 This discussion is based on Chapter 2 of An Introduction to Object- Oriented Programming by Tim- othy B...

Ngày tải lên: 12/08/2014, 21:21

... which are equal to the largest and smallest possible values of type int, that is, to −2 147 483 648 and 2 147 483 647 respectively. It’s certainly easier to remember the names than the nu- merical values. ... 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, everyt...

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

... 100 5 .4 Enums as Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 THIS SECTION simply pulls together a few more miscellaneous features of object oriented programming in Java. ... makes it possible to refer to a class such as java. awt.Color using its simple name, Color. All you have to do is say import java. awt.Color or import java. awt.∗. Uou still have to...

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 ... central com- ponent. If a container, cntr, is using a BorderLayout, then a component, comp, should be added to the container using a statement of the form 1...

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

... 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 represents a file name rather ... new files and can write data to files. In Java, such input and output can be done using streams. Human-readable character data is read from a file using an object belonging to th...

Ngày tải lên: 12/08/2014, 21:21