title: why cannot use "this" in the main method?
body: <pre><code>   public class example {
  
      int a = 0;
  
      public void m() {
          int b = this.a;
      }
  
      public static void main(String[] args) {
          int c = this.a;
      }
  
  }
  </code></pre>
  
  <p>I am new in java. Why I cannot use "this" in the main method?</p>