Java - What is the output: abstract class

Question

What is the output of the following code.

abstract class Foo {
  static {
    System.out.println("abstract static");
  }

  {
    System.out.println("abstract instance");
  }
}

abstract class Bar {
  abstract void hello();
}

public class Main extends Foo {
  public static void main(String[] args) {
    System.out.println("main");
    Main a = new Main();

    Bar b = new Bar() {
      @Override
      void hello() {
        System.out.println(1);
      }
    };
    b.hello();
  }
}

Click to view the answer

abstract static
main
abstract instance
1

Demo

abstract class Foo {
  static {/*w w w .j  av a2  s  .co  m*/
    System.out.println("abstract static");
  }

  {
    System.out.println("abstract instance");
  }
}

abstract class Bar {
  abstract void hello();
}

public class Main extends Foo {
  public static void main(String[] args) {
    System.out.println("main");
    Main a = new Main();

    Bar b = new Bar() {
      @Override
      void hello() {
        System.out.println(1);
      }
    };
    b.hello();
  }
}

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