Programming I Packets and JAR 11th lecture

© Branko Kavšek, Jernej Vičič Packets What are packets and how do we use them? http://java.sun.com/docs/books/tutorial/java/package/index.html The JAR tool http://java.sun.com/docs/books/tutorial/deployment/jar/index.html 11th lecture Programming I © Branko Kavšek, Jernej Vičič

© Branko Kavšek, Jernej Vičič Overview Basic libraries Packets JAR Swing JavaDoc 11th lecture Programming I © Branko Kavšek, Jernej Vičič

Basic libraries JavaTM SE 6 Platform Java Platform, Standard Edition 6 JDK. Version 6

Paketi paketi (packages) so knjižnice Java objektov. v program jih lahko uvozimo z besedo import. Java API vsebuje veliko različnih paketov, lahko pa pakete naredimo tudi sami. Paket je tesno povezan z imenikom datotečnega sistema Vsi javni razredi, ki so v nekem imeniku se lahko med sabo kličejo.

Packets All public classes that are in a directory can call each other. Package behaves as a directory, all the classes of a package are friends (you can call another method, modify / read properties). We must store all classes in the same directory at design time. Packages can be placed in a Java JAR archive.

Packts - example import java.lang.Math; // sedaj lahko uporabljamo metodi iz Math public class Bla { public static void main(String argv[]) { double x=5; System.out.println(Math.sin(x)); // kličemo Math.sin(3.14); }

Packets package PrviPaket; public class Razred{ public static void main(String args[]){ System.out.println("Dober dan!"); } } // Razred

Packets Content of the example must be saved in the file Razred.java, which is located in the directory PrviPaket. Compile file Razred.java as an ordinary Java program. The implementation is slightly different: java PrviPaket/Razred

Pakets - JAR Jar is Java Archive. It is a file format based on the zip and is used to combine multiple files into one. It is primarily designed to facilitate and speed up the handling of java projects. It handles (in addition to Class files) also images similar rubbish.

Packets - JAR Make a jar archive: jar cvf pp.jar PrviPaket/ Start a class in an archive (add to classpath): java -classpath pp.jar PrviPaket/Razred Executable jar files: Open a nerw jar file. Find file MANIFEST.MF Add the line: Main-Class: PrviPaket/Razred Make a new archive: jar cvfm pp1.jar c:\temp\MANIFEST.MF PrviPaket/ Start: java -jar pp1.jar

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