public class Test {

 public static void main(String[] args) {

  //instanceof 父类子类

  Father father1 = new Father();

  System.out.println(father1 instanceof Father ); //ture

  System.out.println(father1 instanceof Son ); //false

  Father father2 = new Son();

  System.out.println(father2 instanceof Father ); //ture

  System.out.println(father2 instanceof Son ); //ture

  Son son = new Son();

  System.out.println(son instanceof Father ); //ture

  System.out.println(son instanceof Son ); //ture

 }

}