======Java====== [[../sw/java.html|java virtual machine (JVM)]] obecne\\ [[../web/j2ee.html|J2EE]] vyvoj\\ ====Obsah:==== [[#odkazy|Externi odkazy]]\\ [[#soubory|Typy souboru]]\\ [[#promenne|Promenne]]\\ [[#operatory|Operatory]]\\ [[#podminky|Podminky, cykly]]\\ [[#tridy|Tridy, objekty, funkce]]\\ [[#priklady|Priklady]]\\ public class trida { int a; } Deklarace objektu tridy pokus: cat pokus.java\\


public class pokus {
  public static void main {
    trida A = new trida();
    A.a = 1;
    System.Out.Println(A.a);
  }
}

Tridy mohou obsahovat i funkce, ktere umi pracovat s promennymy v objektu danne tridy:\\ public class trida { public int a; public trida (int a) { this.a = a; } public trida () { this (1); } public zdvoj () { a *= 2; } } Deklarace objektu tridy pokus: cat pokus.java\\


public class pokus {
  public static void main {
    trida A = new trida(2);
    A.zdvoj();
    System.Out.Println(A.a);
  }
}

class hello ( public static void main (String[] args){ System.out.println("Hello World"); } } ==apppletHello.java==

import java.awt.*;
public class apHello extends java.applet.Applet {
   public void init (){
	add(new Label("Hello World"));
   }
}

==appletHello.htm==


<BODY>
<APPLET code="appletHello.class" width="100" height="30" align="left">
aplet appletHello.class neni podporovan prohlizecem
</APPLET>
</BODY>
</HTML>

==servletHello.java==

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*

public class servletHello extends HttpServlet {
   public void doGet (HttpServletRequest request, HttpServletResponse resopnse) throws IOException {
	PrintWriter out = response.getWriter();
        java.util.Date today = new java.util.Date();
        out.println("Hello, now it is" + today + "");
   }
}

%javac -classpath $PATH_TO_TOMCAT/common/lib/servlet-api.jar -d classes servletHello.java ==WEB-INF/web.xml==


<?xml version="1.0" encoding="ISO-8859-1" ?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">
<servlet>
  <servlet-name>Servlet Hello</servlet-name>

  <servlet-class>servletHello</servlet-class>
</servlet>

<servlet-mapping>
  <servlet-name>Servlet Hello</servlet-name>
  <url-pattern>/hello</url-pattern>

</servlet-mapping>
</web-app>

==time.jsp==


<html>
<body>
Hello, now it is <%= new java.util.Date() %>
</body>

let-mapping>
</html>