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Java Programming Lecture 1 Instructors: Fu-Chiung Cheng (鄭福炯) Associate Professor Computer Science & Engineering Tatung University email: [email protected] 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.
