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my_lesson/_JAVA

Java Applet

by boolean 2016. 2. 16.
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Java Applets

General Steps to Creating, Compiling and Running Java Programs
Applets  in Unix & Linux server


  1. Open a Unix window.

  2. Now, change to the directory of your choice from within the window. 
    For example: 
     prompt% cd MyJavaStuff

  3. Using the editor of your choice, create some Java source code. 
    For example, suppose we want a class named "A", 
        then we would start vi, emacs, pico, or whatever editor with the name of the Java file: 
     prompt% vi A.java
    or
     prompt% emacs A.java
    or
     prompt% pico A.java

  4. The source code, A.java, might look like this: 
     // This program draws a tall rectangle via the A.html applet tag. 
 // mlc
 // 9/1999
 
 import java.applet.*;
 import java.awt.*;
 
 public class A extends Applet
 {
        private int w, h;
        public void init( )
        {
        	w = 45;
        	h = 50;
        }
    
        public void paint(Graphics g)
        {
        	g.drawRect(w, h, 20, 80);
        }
 }
    Don't forget to save the file!

  5. Double check the name of the Java program file you just saved 
        by listing out the files in the current directory: 
     prompt% ls

  6. If the name of the Java program file listed does not end in .java, 
        you need to rename or move (mv) it so that it does 
    For instance, if the file appears as A.java.txt, type
     prompt% mv  A.java.txt  A.java
    Now if you list the files in the directory, you should see it named correctly

  7. Now, since this is an applet, we'll need to make a HTML file. 
    We could call it A.html and create it from the command line using your favorite editor again: 
     prompt% vi A.html
    or
     prompt% emacs A.html
    or
     prompt% pico A.html

  8. The A.html file might look like this: 
     <html>
 <p> This file launches the 'A' applet: A.class! </p>  
 <applet code="A.class" height=200 width=320>
 No Java?!
 </applet>
 </html>

  9. Again, be sure to save the file 
    Also be sure that the name of the file ends in .html (not .txt)

  10. Assuming we saved the Java source code (as in step 4) from within your editor, 
        we can now go back to the command prompt and compile it. 
    This is done with the javac compiler command: 
     prompt% javac A.java

  11. If there were compile errors, go back to the editor and edit the A.java file 
        to remove the error. 
    Then repeat step 10 after saving the changes. 
    You may need to do this several times before there are no more compile errors.

  12. If everything compiles fine 
                    (we know this by the fact we had no error messages 
                    and the "A.class" file exists), 
        we are ready to run it.

  13. At this point (assuming we saved the HTML file in step 5), 
        we can run either a Java-enabled browser or 
            simply use the appletviewer program from the command line: 
     prompt% appletviewer A.html

  14. The above command should bring up a window using the HTML file and 
        then launch (or run) the Java applet from within the viewer. 

      This file launches the 'A' applet: A.class!

    No Java?!

    You should see a tall rectangle. Good work!

appletviewer 속성 파일을 읽을 수 없음:... 기본값을 사용하는 중입니다.

can't read appletviewer properties file:

------- 읽을 수 있게 해주면 된다.

-------Set the permissions  to be able to read 

prompt% chmod 774 TestApplet.*      // TestApplet.java  TestApplet.class TestApplet.html

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