Inner class accessing outer class

TestIt.java

/***
 * http://www.java-forums.org/java-tips/6296-inner-class-accessing-outer-class.html
 **/ 

public class TestIt {
  public static void main(String a[]){
     new TestIt().doit();
     /*
      output :
      Hello world!
     */
  }
  public void doit() {
      new InnerClass().sayHello();
  }
  public void enclosingClassMethod(){
      System.out.println("Hello world!");
  }
 
 
 class InnerClass {
   public void sayHello() {
     TestIt.this.enclosingClassMethod();
   }
 }
}