Lab Basics

• the mechanics of writing and running a correct program include:
   
  1. editor - gedit & at the command line prompt
     The '&' is optional but preferred usage.
     When gedit is running use Open to get your file going or use New to start a new program.

     public class AnotherClient {
     
       public static void main(String[] args){
         System.out.printf("\n\tGreetings, Earthlings! \n\n");
       }
     
     }
     

     
     When you are done, Save as...   AnotherClient.java

  2. compiler - javac AnotherClient.java at the command line prompt

  3. execute - java AnotherClient at the command line prompt

  4. debug - observe your error messages on lines b) & c) above and correct using the editor from a).

1. What is 'source code'?

    

    

2. What is 'bytecode'?

    

    

3. If you add a forgotten semi-colon to your program what must you do, in order, to run your code again?

    

    

5. What's up with this "ASCIIClient.class" download? How do I see what it does?

    

    

6. What does "Reverse Engineering" mean?

    

    

7. System.out.printf
   
   1. How do I get a \ to print?

       

       

   2. How do I get rid of the extra digits past the decimal place when I don't want them?

       

       

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   Everyone today should make sure they can:

   1. login
   2. open a terminal window & a browser
   3. download the 'starter' code from class schedule (website from this morning!)
   4. compile it
   5. interpret(run) it
   6. understand difference between what's possible when downloading .java files versus .class files.

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