Lecture 2

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Quiz Area

From the previous Lecture:

Programming language → execution
Code – human readable (Java)
Executable – machine “readable”
Compiler – converts from code → executable. It's like Google translate for computers
What happens when you type in nonsense?
beatbox
(Must speak the language you're translating from)
Syntax errors – not speaking “java” correctly

The source file:

Request that the compiler "compile the" source file into an executable:

javac exampleFile.java

You should have:

Request that the java runtime "execute the" executable file:

java exampleFile

Where is this request done? Either from the terminal or from an IDE (JGrasp in our case).

Write a Hello World program in JGrasp. First, make sure you place it in a directory that will hold your class work like:

  public class HelloWorld 
  {
    public static void main (String[] argv)
    {
      System.out.println("Hello World!");
    }
  }

This is how it should look in JGrasp:

Press the green PLUS button

Press the red RUNNER button

Finally, Set the number of spaces per tab to 2 (preferred) or 4