/**

  * @Date:2018-04-20

  * @Description:判断Instance

  * - instanceof方法返回一个boolean类型的值，意在告诉我们对象是不是某个特定的类型实例。

  * - isInstance方法则是Class类中的一个Native方法，也是用于判断对象类型的。

  **/

 public class InstanceDemo {

     static void test(Object x) {

         System.out.println("Testing x of type " + x.getClass());

         System.out.println("x instanceof A " + (x instanceof A));

         System.out.println("x instanceof B " + (x instanceof B));

         System.out.println("A.isInstance(x) " + A.class.isInstance(x));

         System.out.println("B.isInstance(x) " +

                 B.class.isInstance(x));

         System.out.println("x.getClass() == A.class " +

                 (x.getClass() == A.class));

         System.out.println("x.getClass() == B.class " +

                 (x.getClass() == B.class));

         System.out.println("x.getClass().equals(A.class)) " +

                 (x.getClass().equals(A.class)));

         System.out.println("x.getClass().equals(B.class)) " +

                 (x.getClass().equals(B.class)));

     }

     public static void main(String[] args) {

         test(new A());

         System.out.println("-------------------------");

         test(new B());

     }

 }

 class A {

 }

 class B extends A {

 }

 Testing x of type class org.study2.reflection.A

  x instanceof A true

  x instanceof B false

  A.isInstance(x) true

  B.isInstance(x) false

  x.getClass() == A.class true

  x.getClass() == B.class false

  x.getClass().equals(A.class)) true

  x.getClass().equals(B.class)) false

  -------------------------

  Testing x of type class org.study2.reflection.B

  x instanceof A true

  x instanceof B true

  A.isInstance(x) true

  B.isInstance(x) true

  x.getClass() == A.class false

  x.getClass() == B.class true

  x.getClass().equals(A.class)) false

  x.getClass().equals(B.class)) true