this should not be referenced in a static method because static methods are associated with the class : this « Modifiers « SCJP

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3. this

public class MainClass {
  public static int i = 0;

  public static void main(String[] argv) {
    System.out.println(this.i);
  }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	Cannot use this in a static context

	at MainClass.main(MainClass.java:5)