visual basic 2008 barcode generator The Object Class and Subclasses in Java

Printing QR Code in Java The Object Class and Subclasses

The Object Class and Subclasses
Drawing QR In Java
Using Barcode creation for Java Control to generate, create Quick Response Code image in Java applications.
Read QR Code 2d Barcode In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Java defines a master superclass called the Object class that is automatically inherited by all other classes, including classes you define in your program This means that your class is a subclass of the Object class without you having to inherit the Object class by using the extends keyword This also means that your class can access method members defined in the Object class
Bar Code Maker In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
Barcode Reader In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
CHAPTER 8 Inheritance
Encode QR Code ISO/IEC18004 In C#.NET
Using Barcode creation for .NET Control to generate, create QR Code image in .NET framework applications.
Draw QR-Code In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
The Object class defines 11 member methods that are available to all classes you define These are shown in Table 8-1
Encoding QR In VS .NET
Using Barcode creation for .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
QR Code JIS X 0510 Creation In Visual Basic .NET
Using Barcode creator for Visual Studio .NET Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
Method Member Object clone() boolean equals(Object obj) void finalize() Class getClass() int hashCode() void notify() void notifyAll() String toString() void wait() void wait(long milliseconds) void wait(int nanoseconds) Description Creates a new object of the object being cloned Determines whether two objects are equal Called before the garbage collector recycles an object Retrieves the class of an object at run time Returns the hash code of an object Resumes execution of a thread that is waiting for an object to be called Resumes execution of all threads that are waiting for an object to be called Returns a string of the object Waits for another thread in order to call an object
Linear Barcode Printer In Java
Using Barcode encoder for Java Control to generate, create 1D Barcode image in Java applications.
USS Code 128 Drawer In Java
Using Barcode creator for Java Control to generate, create Code 128B image in Java applications.
Table 8-1
Creating Barcode In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.
Creating Bar Code In Java
Using Barcode generation for Java Control to generate, create bar code image in Java applications.
Method Members of the Object Class
Creating 2 Of 5 Standard In Java
Using Barcode printer for Java Control to generate, create Code 2/5 image in Java applications.
GTIN - 13 Generator In Java
Using Barcode encoder for Eclipse BIRT Control to generate, create GTIN - 13 image in BIRT applications.
Quiz
Making ANSI/AIM Code 128 In Java
Using Barcode generator for Android Control to generate, create Code 128 Code Set C image in Android applications.
Creating UPCA In None
Using Barcode drawer for Microsoft Excel Control to generate, create UPC Symbol image in Office Excel applications.
1 What is an abstract method member of a class 2 Explain the is a rule of inheritance 3 What is the purpose of the keyword extends 4 What effect does the keyword final have on a method member 5 What is a superclass 6 What is an abstract class 7 What is the Object class 8 How can you prevent a class from being inherited 9 What is the purpose of the keyword super 10 What is multilevel inheritance
UPC Code Drawer In Java
Using Barcode creator for Android Control to generate, create UPC A image in Android applications.
Code 128 Code Set C Creation In None
Using Barcode generation for Online Control to generate, create Code 128 image in Online applications.
This page intentionally left blank
Barcode Maker In None
Using Barcode printer for Office Word Control to generate, create barcode image in Office Word applications.
Linear Encoder In VS .NET
Using Barcode creator for ASP.NET Control to generate, create Linear image in ASP.NET applications.
CHAPTER
Exception Handling
It might be wishful thinking to suppose that every program you write will work perfectly each time it runs The fact of the matter is, well-designed and craftily coded programs run nearly perfectly all the time, but that s not good enough for many applications that can t afford to have an error cause them to crash There isn t any way to guarantee that errors won t occur However, there is a way to have your program handle errors when they happen by writing code that handles those exceptions to normal operations of your program Programmers call this exception handling, which is the topic of this chapter
What Is an Exception
An exception is something other than what occurs normally For example, most cars stop at red lights A car that passes through a red light is an exception Exception
Copyright 2004 by The McGraw-Hill Companies Click here for terms of use
Java Demystified
handling is something that addresses the exception, by either correcting the problem or preventing the problem from worsening In the case of the erratic motorist who runs the red light, a police officer addresses this exception by stopping the car and giving the driver a summons Hopefully, the summons corrects the driver s poor driving behavior The police officer might also park his police car near the intersection to prevent the problem from worsening Only the foolhardy would tempt fate by driving through a red light in clear view of a police officer In programming, two kinds of exceptions might occur with a program These are commonly referred to as compile errors and run-time errors A compile error usually occurs because the programmer made a fundamental mistake in the program, such as failing to include a semicolon at the end of a statement or mistyping the name of a variable The compiler catches these kinds of errors A run-time error occurs when the program runs and is caused by a number of reasons, such as the program anticipating something that doesn t happen Let s say that a program calculates the average grade of students who take a test The instructor first enters into the program the number of students who sat for the test and then enters the test scores The program tallies the scores and divides by the number of students who sat for the test Suppose the instructor entered zero as the number of students who took the test, but entered the test scores The program tries to divide by zero when calculating the average grade This is illegal and causes a run-time error In this case, the program anticipated that the instructor would enter a number greater than zero, which didn t happen Run-time errors are more serious than compile errors because the programmer is around to address a compiler error, but is likely not available when a run-time error occurs Therefore, programmers must anticipate run-time problems and build into a program ways to address those problems automatically
Copyright © OnBarcode.com . All rights reserved.