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Java Programming Lecture 1

Java Programming Lecture 1. Instructors: Fu-Chiung Cheng ( 鄭福炯 ) Associate Professor Computer Science & Engineering Tatung U niversity email: cheng@cse.tt u .edu.tw http:/ / www.cse.ttu.edu.tw/~cheng. Contents (chapter 1). Short History Java Development tools

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Java Programming Lecture 1

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  1. 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

  2. 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

  3. History • James Gosling • Oak (Embedded consumer electronic appliances) • Java, May 20, 1995, Sun World • HotJava • The first Java-enabled Web browser

  4. 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 ??)

  5. 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)

  6. 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

  7. Getting Started with Java Programming • A Simple Java Application • Compiling Programs • Executing Applications • A Simple Java Applet • Viewing Java Applets • Applications vs. Applets

  8. 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

  9. Compiling Programs • On command line • javac file.java

  10. Executing Applications • On command line • java classname

  11. Example javac Welcome.java java Welcome output:...

  12. 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

  13. Creating an HTML File <html> <body> <applet code="WelcomeApplet.class" width = 100 height = 40> </applet> </body> </html>

  14. Viewing Java Applets

  15. Applet Viewer Utility appletviewer htmlfile.html Example: appletviewer WelcomeApplet.html Run Applet Viewer

  16. Applications vs. Applets • Similarities • Differences

  17. 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.

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