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Understanding Packages
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the package statement
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The package statement includes the package keyword, followed by the package path delimited with periods. Table 1-2 shows valid examples of package statements. Package statements have the following attributes:
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n Package statements are optional. n Package statements are limited to one per source file. n Standard coding convention for package statements reverses the domain
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name of the organization or group creating the package. For example, the owners of the domain name scjaexam.com may use the following package name for a utilities package: com.scjaexam.utilities.
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n Package names equate to directory structures. The package name com .scjaexam.utils would equate to the directory com/scjaexam/utils. n The package names beginning with java.* and javax.* are reserved for
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use by JavaSoft, the business unit of Sun Microsystems that is responsible for Java technologies.
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n Package names should be lowercase. Individual words within the package
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name should be separated by underscores. The Java SE API contains several packages. These packages are detailed in Sun s Online JavaDoc documentation at http://java.sun.com/javase/6/docs/api. Common packages you will see on the exam are packages for the Java Abstract Window Toolkit API, the Java Swing API, the Java Basic Input/Output API, the Java Networking API, the Java Utilities API, and the core Java Language API. You will need to know the basic functionality that each package/API contains.
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the import statement
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An import statement allows you to include source code from other classes into a source file at compile time. In J2SE 1.4, the import statement includes the
taBle 1-2
package statement
package java.net; package com.scjaexam.utilities; package package_name;
related Directory structure
[directory_path]\java\net\ [directory_path]\com\scjaexam\utilities\ [directory_path]\package_name\
Valid package Statements
1:
Packaging, Compiling, and Interpreting Java Code
SCEnArIO & SOlUTIOn
To paint basic graphics and images, which package should you use To create lightweight components for GUI, which package should you use To utilize data streams, which package should you use To develop a networking application, which package should you use To work with the collections framework, event model, and date/time facilities, which package should you use To utilize the core Java classes and interfaces, which package should you use You will need to use the Java AWT API package. You will need to use the Java Swing API package. You will need to use the Java Basic I/O package. You will need to use the Java Networking API package. You will need to use the Java Utilities API package. You will need to use the core Java Language package.
import keyword followed by the package path delimited with periods and ending with a class name or an asterisk, as shown in Table 1-3. These import statements occur after the optional package statement and before the class definition. Each import statement can only relate to one package.
taBle 1-3
import statement
import java.net.*;
Definition
Imports all of the classes from the package java.net. Imports only the URL class from the package java.net. Imports all static members of the Color class of the package java.awt (J2SE 5.0 onward only). Imports the static member CS_GRAY of the Color class of the package java.awt (J2SE 5.0 onward only).
Valid import Statements
import java.net.URL;
import static java.awt.Color.*;
import static java.awt.color.ColorSpace .CS_GRAY;
Understanding Packages
For maintenance purposes, it is better to explicitly import your classes.This will allow the programmer to quickly determine which external classes are used throughout the class. As an example, rather than using import java .util.*, use import java.util.Vector. In this real-world example, the coder would quickly see (with the latter approach) that the class only imports one class and it is a collection type. In this case, it is a legacy type and the determination to update the class with a newer collection type could be done quickly. C and C++ programmers will see some look-and-feel similarities between Java s import statement and C/C++ s #include statement, even though there isn t a direct mapping in functionality.
Static imports are a new feature to Java SE 5.0. Static imports allow you to import static members.The following example statements would be valid in Java SE 5.0, but would be invalid for J2SE 1.4.
/* Import static member ITALY */ import static java.util.Locale.ITALY; /* Imports all static members in class Locale */ import static java.util.Locale.*;
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