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Java Programming
Lecture 1
Instructors:
Fu-Chiung Cheng
(鄭福炯)
Associate Professor
Computer Science & Engineering
Tatung University
email: cheng@cse.ttu.edu.tw
http:// www.cse.ttu.edu.tw/~cheng
Contents (chapter 1)
Short History
Java Development tools
Install JBuilder Tool and Samples
Getting Started With Java Programming
Compiling and Running a Java
Application
Compiling and Running a Java Applet
History
James Gosling
Oak (Embedded consumer electronic
appliances)
Java, May 20, 1995, Sun World
HotJava
The first Java-enabled Web browser
JDK Versions
JDK 1.02 (1995)
JDK 1.1 (1996)
Java 2 SDK v 1.2 (a.k.a JDK 1.2, 1998)
Java 2 SDK v1.3 (a.k.a JDK 1.2, 2000)
Java 2 SDK v1.4 (Dec. 2001)
Java 2 SDK v1.5 (June 2003 ??)
Java Development Tools
Sun JDK
Inprise JBuilder (RAD)
Microsoft Visual J++
Symantec Café (RAD)
Rouge Wave JFactory
Sun Java Workshop
IBM Visual Age for Java (RAD)
Install JBuilder and Samples
Install JBuilder
Install Sample Programs
Setup JDK 1.2.2 environment
Set classpath=%classpath%;c:\jbbook
Set path=%path%;c:\jdk1.2.2\bin
Check Java Home:
www.javasoft.com
Getting Started with Java
Programming
A Simple Java Application
Compiling Programs
Executing Applications
A Simple Java Applet
Viewing Java Applets
Applications vs. Applets
A Simple Application
Example 1.1
//This application program prints Welcome
//to Java!
public class Welcome
{
public static void main (String[] args)
{
System.out.println("Welcome to Java!");
}
}
Source
Run
Compiling Programs
On command line
javac file.java
Java Source
File
Compiler
Bytecode
Executing Applications
On command line
java classname
Bytecode
Java
Interpreter
on Unix
Java
Interpreter
on Windows
Java
Interpreter
on Sun
Example
javac Welcome.java
java Welcome
output:...
A Simple Applet
Example 1.2
/* This is an example of Java applets */
import java.awt.Graphics;
public class WelcomeApplet
extends java.applet.Applet {
public void paint (Graphics g)
{
g.drawString("Welcome to Java!",10,10);
}
}
Source
Creating an HTML File
<html>
<body>
<applet code="WelcomeApplet.class"
width = 100 height = 40>
</applet>
</body>
</html>
Viewing Java Applets
Applet
Browser with
Java
Interpretation
on Sun
Browser with
Java
Interpretation
on Windows
Applet Viewer Utility
appletviewer htmlfile.html
Example:
appletviewer WelcomeApplet.html
Run Applet Viewer
Applications vs. Applets
Similarities
Differences
Security Restrictions on Applets
Applets are not allowed to read from, or write
to, the file system of the computer viewing the
applets.
Applets are not allowed to run any programs
on the browser’s computer.
Applets are not allowed to establish
connections between the user’s computer
and another computer except with the server
where the applets are stored.
