[[basics:intro|Intro]]
[[basics:ex1|Ex1]]
[[basics:ex2|Ex2]]
[[basics:ex3|Ex3]]
[[basics:ex4|Ex4]]
[[basics:ex5|Ex5]]
[[basics:ex6|Ex6]]
[[basics:ex7|Ex7]]
====== The Basics: Intro ======

In this exercise, you will use aspects to instrument a dummy class in order to get acquainted with the basic techniques of AspectJ: pointcuts, advices and inter-type declarations.

===== Set-up =====

  - Create a **new AspectJ Project** in Eclipse
  - Create a **new class** ''Application'' containing the code given below.
  - **Run** the code. Right-click the ''Application'' class and select **Run as...** -> **AspectJ/Java Application**

<code aspectj>
public class Application {
  public int go = 10;
  
  public void start() {
    System.out.println("Starting");
    stop(go);
  }

  public void stop(int i) {
    System.out.println("Stopping");
  }

  public void exec() throws Exception {
    throw new Exception("An exception");
  }

  public String toString() {
    return "Application go: " + go;
  }

  public static void main(String[] arg) {
    Application t = new Application();
    System.out.println(t);
    t.start();
    t.stop(25);
    try { t.exec(); }
    catch(Exception e) { System.out.println(e); }
  }
}
</code>

You should see the following output on the **Console** view (which you can open through **Window** -> **Show View** -> **Console**):

<code>
Application go: 10
Starting
Stopping
Stopping
java.lang.Exception: An exception
</code>

<note tip>
In the following steps, you can use Eclipse's Run button (or the shortcut CTRL+F11) to quickly rerun the application using the last run configuration.
</note>

----

Start the Basics track at [[basics:ex1|Exercise 1]].